{"id":51662,"date":"2026-11-02T09:13:53","date_gmt":"2026-11-02T09:13:53","guid":{"rendered":"https:\/\/edukemy.com\/blog\/?p=51662"},"modified":"2026-11-02T17:55:36","modified_gmt":"2026-11-02T17:55:36","slug":"mechanism-of-indian-monsoons-and-rainfall-patterns","status":"publish","type":"post","link":"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/","title":{"rendered":"Mechanism of Indian Monsoons and Rainfall Patterns"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-6aeb6bc338359\" class=\"ez-toc-cssicon-toggle-label\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6aeb6bc338359\"  \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#The_South_Asian_Monsoon_General_Characteristics_and_Unique_Features\" >The South Asian Monsoon: General Characteristics and Unique Features\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#1_De%EF%AC%81ning_the_Monsoon_Phenomenon\" >1. De\ufb01ning the Monsoon Phenomenon\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#2_The_Unique_Characteristics_of_the_South_Asian_Monsoon\" >2. The Unique Characteristics of the South Asian Monsoon\u00a0<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#Theories_on_the_Mechanism_of_the_South_Asian_Monsoon\" >Theories on the Mechanism of the South Asian Monsoon\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#1_Classical_Theories_and_Their_Limitations\" >1. Classical Theories and Their Limitations\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#The_Thermal_Theory_Hadleys_Theory\" >The Thermal Theory (Hadley&#8217;s Theory)\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#The_Air_Mass_Theory_Flohns_Theory\" >The Air Mass Theory (Flohn&#8217;s Theory)\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#Modern_Theories_Incorporating_Upper-Atmospheric_Dynamics\" >Modern Theories: Incorporating Upper-Atmospheric Dynamics\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#The_Tibetan_Heating_Theory_Koteswarams_Theory\" >The Tibetan Heating Theory (Koteswaram&#8217;s Theory)\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#The_Jet_Stream_Theory_Yins_Theory_and_the_Onset_Mechanism\" >The Jet Stream Theory (Yin&#8217;s Theory) and the Onset Mechanism\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#The_Critical_In%EF%AC%82uence_of_the_Sub-Tropical_Westerly_Jet_STWJ\" >The Critical In\ufb02uence of the Sub-Tropical Westerly Jet (STWJ)\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#The_Conflict_Thermal_Low_vs_Dynamic_High\" >The Conflict: Thermal Low vs. Dynamic High\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#The_Blocking_Effect\" >The Blocking Effect\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#A_Consolidated_View_of_Jet_Stream_In%EF%AC%82uence_on_Indian_Monsoons\" >A Consolidated View of Jet Stream In\ufb02uence on Indian Monsoons\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#Global_Oscillations_and_Their_Impact_on_Monsoon_Variability\" >Global Oscillations and Their Impact on Monsoon Variability\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#1_El_Nino_Southern_Oscillation_ENSO\" >1. El Ni\u00f1o Southern Oscillation (ENSO)\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#2_Indian_Ocean_Dipole_IOD\" >2. Indian Ocean Dipole (IOD)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#3_Madden-Julian_Oscillation_MJO\" >3. Madden-Julian Oscillation (MJO)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#4_Compounding_Factors_and_Prediction_Complexity\" >4. Compounding Factors and Prediction Complexity\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#The_Seasonal_Cycle_in_India\" >The Seasonal Cycle in India\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#The_Hot_Dry_Summers_Mar_15_%E2%80%93_Jun_15\" >The Hot, Dry Summers (Mar 15 &#8211; Jun 15)\u00a0<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#PYQs\" >PYQs<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/edukemy.com\/blog\/mechanism-of-indian-monsoons-and-rainfall-patterns\/#In_case_you_still_have_doubts_contact_us_at_9773890604\" >In case you still have doubts, contact us at 9773890604<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"The_South_Asian_Monsoon_General_Characteristics_and_Unique_Features\"><\/span><b><span data-contrast=\"none\">The South Asian Monsoon: General Characteristics and Unique Features<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1425,&quot;335559731&quot;:15,&quot;335559737&quot;:852,&quot;335559738&quot;:356,&quot;335559739&quot;:0,&quot;335559740&quot;:273,&quot;469777462&quot;:[2013],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h1>\r\n<h3><span class=\"ez-toc-section\" id=\"1_De%EF%AC%81ning_the_Monsoon_Phenomenon\"><\/span><b><span data-contrast=\"none\">1. De\ufb01ning the Monsoon Phenomenon<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1912,&quot;335559737&quot;:0,&quot;335559738&quot;:299,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:472,&quot;469777462&quot;:[1912],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"auto\">Before delving into the complex mechanisms that drive the Indian monsoon, it is essential to \ufb01rst de\ufb01ne the general characteristics of monsoon systems as a global climatic phenomenon. Monsoons are not unique to South Asia but are a feature of several tropical regions around the world.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:500,&quot;335559738&quot;:303,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:500,&quot;335559738&quot;:303,&quot;335559740&quot;:276}\"><br \/><\/span> <span data-ccp-props=\"{&quot;335559738&quot;:9}\"> <img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-51663 aligncenter\" src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/WhatsApp-Image-2026-10-30-at-7.42.12-PM.jpeg\" alt=\"\" width=\"622\" height=\"339\" \/><\/span> <br \/><span data-contrast=\"auto\">In general terms, monsoons can be de\ufb01ned by the following characteristics:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:500,&quot;335559738&quot;:1,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"3\"><span data-contrast=\"auto\">A feature of tropical, warm climates.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2159,&quot;335559737&quot;:0,&quot;335559738&quot;:1,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:359,&quot;469777462&quot;:[2159],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"3\"><span data-contrast=\"auto\">Essentially modi\ufb01ed trade winds.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2159,&quot;335559737&quot;:0,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:359,&quot;469777462&quot;:[2159],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"2\" data-aria-level=\"3\"><span data-contrast=\"auto\">Characterised by a seasonal reversal of winds.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2159,&quot;335559737&quot;:0,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:359,&quot;469777462&quot;:[2159],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"3\" data-aria-level=\"3\"><span data-contrast=\"auto\">Linked to alternate wet and dry conditions.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2159,&quot;335559737&quot;:0,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:359,&quot;469777462&quot;:[2159],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"4\" data-aria-level=\"3\"><span data-contrast=\"auto\">Associated with climatic extremes such as \ufb02oods and droughts.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2159,&quot;335559737&quot;:0,&quot;335559738&quot;:58,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:359,&quot;469777462&quot;:[2159],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<p><span data-contrast=\"auto\">Globally, regions that experience these types of monsoon climates include the coasts of Brazil, Somalia, and the Gulf of Guinea, as well as broader regions such as South Asia, Southeast Asia, and Northern Australia. While these general features apply broadly, the South Asian monsoon possesses several unique attributes that require a more advanced and speci\ufb01c explanation.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:500,&quot;335559738&quot;:297,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"2_The_Unique_Characteristics_of_the_South_Asian_Monsoon\"><\/span><span data-ccp-props=\"{}\">2. <\/span><b><span data-contrast=\"none\">The Unique Characteristics of the South Asian Monsoon<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1912,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:472,&quot;469777462&quot;:[1912],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"auto\">The South Asian monsoon system exhibits several unique features that distinguish it from the general global pattern, making its mechanism a subject of intense scienti\ufb01c study for decades. These characteristics cannot be explained by simple thermal theories alone.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:500,&quot;335559738&quot;:302,&quot;335559740&quot;:278}\">\u00a0<\/span> <span data-contrast=\"auto\">The speci\ufb01c, unique features of the Indian monsoon are:<\/span><span data-ccp-props=\"{&quot;335559685&quot;:1440,&quot;335559738&quot;:232}\">\u00a0<\/span><\/p>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">Sudden Onset: <\/span><\/b><span data-contrast=\"auto\">The beginning of the rainy season is not gradual but is marked by a rapid and abrupt event often referred to as the &#8220;burst&#8221; of the monsoon.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:2160,&quot;335559737&quot;:506,&quot;335559738&quot;:297,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[2160],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">Gradual Advance and Retreat: <\/span><\/b><span data-contrast=\"auto\">Following the initial onset, the monsoon slowly progresses across the subcontinent over several weeks. Similarly, its withdrawal at the end of the season is a gradual process.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2160,&quot;335559737&quot;:566,&quot;335559738&quot;:2,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[2160],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"2\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">Associated Weather Systems: <\/span><\/b><span data-contrast=\"auto\">The monsoon season is in\ufb02uenced by, and interacts with, other distinct weather phenomena, including Western Disturbances and tropical cyclones.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2160,&quot;335559737&quot;:552,&quot;335559738&quot;:1,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[2160],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"3\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">High Rainfall Variability: <\/span><\/b><span data-contrast=\"auto\">The monsoon is not a continuous period of rain. It is characterised by signi\ufb01cant \ufb02uctuations in rainfall intensity and duration, including extended dry periods known as &#8220;monsoon breaks.&#8221;<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2160,&quot;335559737&quot;:549,&quot;335559738&quot;:1,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[2160],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<p><span data-contrast=\"auto\">Any comprehensive theory of the Indian monsoon must be able to account for not only the general characteristics of wind reversal but also these speci\ufb01c and unique features that de\ufb01ne its behaviour over the subcontinent.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:366,&quot;335559738&quot;:243,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<h1><span class=\"ez-toc-section\" id=\"Theories_on_the_Mechanism_of_the_South_Asian_Monsoon\"><\/span><b><span data-contrast=\"none\">Theories on the Mechanism of the South Asian Monsoon<\/span><\/b><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1425,&quot;335559731&quot;:15,&quot;335559737&quot;:1507,&quot;335559738&quot;:356,&quot;335559739&quot;:0,&quot;335559740&quot;:273,&quot;469777462&quot;:[2013],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h1>\r\n<h3><span class=\"ez-toc-section\" id=\"1_Classical_Theories_and_Their_Limitations\"><\/span><b><span data-contrast=\"none\">1. Classical Theories and Their Limitations<\/span><\/b><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1912,&quot;335559737&quot;:0,&quot;335559738&quot;:300,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:472,&quot;469777462&quot;:[1912],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"none\">The scienti\ufb01c understanding of the monsoon has evolved signi\ufb01cantly over time.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559738&quot;:302,&quot;335559739&quot;:120,&quot;335559740&quot;:278}\">\u00a0<\/span> <span data-contrast=\"none\">The earliest theories were based on observable, surface-level phenomena, providing an intuitive but ultimately incomplete picture of the complex atmospheric processes at play.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:500,&quot;335559738&quot;:238,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<h3 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"The_Thermal_Theory_Hadleys_Theory\"><\/span><b><span data-contrast=\"none\">The Thermal Theory (Hadley&#8217;s Theory)<\/span><\/b><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559685&quot;:1440,&quot;335559738&quot;:242,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"none\">This classical theory posits that monsoons are simply a regional-scale manifestation of a land and sea breeze, driven by the differential heating of land and sea across seasons.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559738&quot;:302,&quot;335559739&quot;:120,&quot;335559740&quot;:273}\">\u00a0<\/span><\/p>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"2\" data-list-defn-props=\"{&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"3\"><span data-contrast=\"none\">The seasonal parallel is direct:<br \/><\/span><b><span data-contrast=\"none\">Summer <\/span><\/b><span data-contrast=\"none\">is analogous to <\/span><b><span data-contrast=\"none\">daytime<\/span><\/b><span data-contrast=\"none\">, where the hot landmass develops a low-pressure area, drawing in moist, cooler winds from the sea (onshore winds).<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2880,&quot;335559737&quot;:740,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[2880],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\"> <br \/><\/span><b><span data-contrast=\"none\">Winter <\/span><\/b><span data-contrast=\"none\">is analogous to <\/span><b><span data-contrast=\"none\">nighttime<\/span><\/b><span data-contrast=\"none\">, where the land cools faster than the sea, creating a high-pressure area that causes winds to \ufb02ow from the cool land towards the warmer sea (offshore winds).<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2880,&quot;335559737&quot;:382,&quot;335559738&quot;:2,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[2880],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<p><span data-contrast=\"none\">While this theory correctly identi\ufb01es the fundamental principle of seasonal wind reversal, it is now considered too <\/span><b><span data-contrast=\"none\">trivial <\/span><\/b><span data-contrast=\"none\">and <\/span><b><span data-contrast=\"none\">simplistic<\/span><\/b><span data-contrast=\"none\">.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:1440,&quot;335559737&quot;:379,&quot;335559738&quot;:242,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span> <span data-contrast=\"none\">It correctly identi\ufb01es the outcome (wind reversal) but fails to explain the complex underlying causes, much like stating an accident was caused by a car hitting a bicycle without analysing the dynamics of speed, road rules,<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:1440,&quot;335559731&quot;:68,&quot;335559737&quot;:560,&quot;335559738&quot;:241,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span><span data-contrast=\"none\">or driver action. Its primary limitation is its failure to explain the de\ufb01ning characteristics of the monsoon.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:500,&quot;335559738&quot;:1,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span> <span data-contrast=\"none\">It cannot answer fundamental questions such as why the phenomenon is con\ufb01ned to the tropics and linked to trade winds, nor can it account for the unique features of the Indian monsoon like its sudden onset, gradual retreat, or high variability.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559731&quot;:68,&quot;335559737&quot;:366,&quot;335559738&quot;:241,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<h3 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"The_Air_Mass_Theory_Flohns_Theory\"><\/span><b><span data-contrast=\"none\">The Air Mass Theory (Flohn&#8217;s Theory)<\/span><\/b><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559685&quot;:1440,&quot;335559738&quot;:242,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"none\">A more sophisticated classical explanation is the Air Mass Theory, which connects the monsoon to global atmospheric circulation patterns. The core mechanism of this theory is the seasonal migration of the Inter-Tropical Convergence Zone (ITCZ)\u2014the low-pressure belt where the trade winds converge\u2014as it follows the apparent movement of the sun.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559738&quot;:302,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<br \/><\/span><\/p>\r\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559738&quot;:302,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\"> <img decoding=\"async\" class=\"wp-image-51664 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/media_image.png\" alt=\"\" width=\"595\" height=\"323\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 595px; --smush-placeholder-aspect-ratio: 595\/323;\" \/><\/span> <br \/><b><span data-contrast=\"none\">Summer Monsoon: <\/span><\/b><span data-contrast=\"none\">As the sun moves into the Northern Hemisphere, the ITCZ shifts far north, positioning itself over the<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2160,&quot;335559737&quot;:979,&quot;335559738&quot;:343,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[2160],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span data-contrast=\"none\">Indian subcontinent near the Himalayan foothills. To reach this low-pressure zone, the Southeast Trade Winds from the Southern Hemisphere must cross the equator. Upon crossing, they are de\ufb02ected to the right by the Coriolis force and approach the subcontinent as the Southwest Monsoon winds.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:2160,&quot;335559737&quot;:860,&quot;335559738&quot;:1,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span> <br \/><b><span data-contrast=\"none\"><br \/>Winter Monsoon: <\/span><\/b><span data-contrast=\"none\">When the sun shifts into the Southern Hemisphere, the ITCZ moves south of the equator. This allows the dominant Northeast Trade Winds to re-establish themselves over India, creating the dry winter monsoon.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2160,&quot;335559737&quot;:796,&quot;335559738&quot;:2,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[2160],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span> <span data-contrast=\"none\">This theory represents a signi\ufb01cant improvement over the simple thermal concept, as it correctly explains the monsoon&#8217;s tropical nature and its direct link to the global trade wind system.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:519,&quot;335559738&quot;:243,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span> <span data-contrast=\"none\">However, it still <\/span><b><span data-contrast=\"none\">cannot explain the unique features <\/span><\/b><span data-contrast=\"none\">of the Indian monsoon, such as the sudden burst, the in\ufb02uence of Western Disturbances, or the occurrence of monsoon breaks.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:366,&quot;335559738&quot;:242,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span> <span data-contrast=\"none\">The inadequacies of these classical theories necessitated the development of modern models that incorporate upper-atmospheric dynamics and topographical in\ufb02uences.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:500,&quot;335559738&quot;:241,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<br \/><\/span><\/p>\r\n<p><img decoding=\"async\" class=\"wp-image-51665 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/media_image2.png\" alt=\"\" width=\"626\" height=\"344\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 626px; --smush-placeholder-aspect-ratio: 626\/344;\" \/><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Modern_Theories_Incorporating_Upper-Atmospheric_Dynamics\"><\/span><b><span data-contrast=\"none\">Modern Theories: Incorporating Upper-Atmospheric Dynamics<\/span><\/b><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;201341983&quot;:0,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559685&quot;:1055,&quot;335559737&quot;:0,&quot;335559738&quot;:359,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:472,&quot;469777462&quot;:[1055],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"none\">The modern understanding of the monsoon views it as a complex,<\/span><span data-ccp-props=\"{&quot;335559685&quot;:1440,&quot;335559738&quot;:297,&quot;335559739&quot;:120}\">\u00a0<\/span><span data-contrast=\"none\">three-dimensional system. It is driven not just by surface heating but by an intricate interplay of ocean thermal conditions, the role of highlands like the Tibetan Plateau, and, critically, the behaviour of powerful, high-altitude wind patterns known as jet streams.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:406,&quot;335559738&quot;:62,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<h3 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"The_Tibetan_Heating_Theory_Koteswarams_Theory\"><\/span><b><span data-contrast=\"none\">The Tibetan Heating Theory (Koteswaram&#8217;s Theory)<\/span><\/b><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559685&quot;:1440,&quot;335559738&quot;:242,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"none\">This theory identi\ufb01es the primary &#8220;heat engine&#8221; driving the powerful summer monsoon.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:500,&quot;335559738&quot;:303,&quot;335559739&quot;:120,&quot;335559740&quot;:273}\">\u00a0<\/span> <span data-contrast=\"none\">The central argument is that the intense and sustained heating of the vast and high-altitude <\/span><b><span data-contrast=\"none\">Tibetan Plateau <\/span><\/b><span data-contrast=\"none\">is a far more powerful and consistent driver than the heating of the Indian subcontinent&#8217;s plains alone.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:519,&quot;335559738&quot;:243,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<br \/><\/span><\/p>\r\n<p><span data-ccp-props=\"{}\"><img decoding=\"async\" class=\"wp-image-51666 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/media_image-1.png\" alt=\"\" width=\"601\" height=\"323\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 601px; --smush-placeholder-aspect-ratio: 601\/323;\" \/> <br \/><\/span><span data-contrast=\"none\">This intense heating occurs because the plateau&#8217;s high elevation means the atmosphere is rare\ufb01ed, with less moisture, dust, and pollutants to re\ufb02ect or absorb incoming solar radiation, allowing for exceptionally strong surface heating during summer.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:479,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"2\" data-list-defn-props=\"{&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"1\"><b><span data-contrast=\"none\">Role of the Tropical Easterly Jet Stream (TEJ): <\/span><\/b><span data-contrast=\"none\">The immense volume of air rising over the hot Tibetan Plateau diverges in the upper troposphere. This out\ufb02ow organizes into a high-speed,<\/span> high-altitude river of air known as the Tropical Easterly Jet Stream (TEJ), which \ufb02ows from east to west over Peninsular India.<span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559685&quot;:2160,&quot;335559737&quot;:747,&quot;335559738&quot;:2,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"2\" data-list-defn-props=\"{&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><b><span data-contrast=\"none\">Impact of the TEJ: <\/span><\/b><span data-contrast=\"none\">The strength of the TEJ has a <\/span><b><span data-contrast=\"none\">positive correlation <\/span><\/b><span data-contrast=\"none\">with the strength of the monsoon. Speci\ufb01cally, the TEJ helps to &#8220;steer&#8221; or &#8220;drag&#8221; tropical depressions (low-pressure systems) that form over the Bay of Bengal westward across the Indian mainland. These depressions are responsible for a signi\ufb01cant portion of the monsoon&#8217;s rainfall.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2160,&quot;335559737&quot;:426,&quot;335559738&quot;:1,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[2160],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2264,&quot;335559738&quot;:192,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:359}\"> <img decoding=\"async\" class=\"wp-image-51667 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/media_image2-1.png\" alt=\"\" width=\"635\" height=\"347\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 635px; --smush-placeholder-aspect-ratio: 635\/347;\" \/><\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"The_Jet_Stream_Theory_Yins_Theory_and_the_Onset_Mechanism\"><\/span><b><span data-contrast=\"none\">The Jet Stream Theory (Yin&#8217;s Theory) and the Onset Mechanism<\/span><\/b><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559685&quot;:1440,&quot;335559738&quot;:373,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"none\">This theory provides a crucial explanation for one of the monsoon&#8217;s most unique features: its sudden onset. The mechanism is linked to the seasonal behaviour of another major jet stream, the Subtropical Westerly Jet Stream (STWJ).<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559738&quot;:302,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"1\"><b><span data-contrast=\"none\">The &#8220;Blocking&#8221; Mechanism: <\/span><\/b><span data-contrast=\"none\">In the months preceding the monsoon, the powerful STWJ, \ufb02owing from west to east, is bifurcated by the massive obstacle of the Himalayas and the Tibetan Plateau. This split creates a strong southern branch that \ufb02ows over the northern plains of India. This high-altitude southern branch induces a <\/span><b><span data-contrast=\"none\">dynamic high-pressure system <\/span><\/b><span data-contrast=\"none\">on the surface below it. This high pressure effectively counteracts the thermal low pressure building over the heating subcontinent, <\/span><b><span data-contrast=\"none\">blocking <\/span><\/b><span data-contrast=\"none\">the moisture-laden southwest winds from advancing into India. The monsoon winds essentially stall off the coast, unable to proceed inland.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:2160,&quot;335559737&quot;:386,&quot;335559738&quot;:363,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[2160],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:2160,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><b><span data-contrast=\"none\">The &#8220;Sudden Onset&#8221;: <\/span><\/b><span data-contrast=\"none\">The &#8220;burst&#8221; of the monsoon is triggered in late May or early June. As the sun&#8217;s apparent position shifts further north, the entire STWJ system is forced to migrate north of the Himalayas. The abrupt disappearance of its southern &#8220;blocking&#8221; branch causes the surface high pressure to collapse. This allows the powerful,<\/span> pre-existing Tibetan low-pressure system to suddenly and forcefully pull the waiting, moisture-rich monsoon winds onto the subcontinent, resulting in the dramatic onset of the rainy season.<span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:2160,&quot;335559737&quot;:500,&quot;335559738&quot;:1,&quot;335559739&quot;:120,&quot;335559740&quot;:276}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<p><span data-ccp-props=\"{}\"> <img decoding=\"async\" class=\"wp-image-51668 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/media_image3.png\" alt=\"\" width=\"633\" height=\"340\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 633px; --smush-placeholder-aspect-ratio: 633\/340;\" \/><\/span> <span data-ccp-props=\"{}\"> <img decoding=\"async\" class=\"wp-image-51669 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/media_image4.png\" alt=\"\" width=\"627\" height=\"337\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 627px; --smush-placeholder-aspect-ratio: 627\/337;\" \/><\/span> <span data-ccp-props=\"{}\"> <img decoding=\"async\" class=\"wp-image-51670 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/media_image5.png\" alt=\"\" width=\"624\" height=\"347\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 624px; --smush-placeholder-aspect-ratio: 624\/347;\" \/><\/span> <br \/><span data-contrast=\"none\">In summary, the modern view recognises the South Asian monsoon as a deeply complex phenomenon, governed by a dynamic interplay between surface thermodynamics (land\/sea heating), the unique high-altitude topography of the Tibetan Plateau, and the powerful, controlling in\ufb02uence of upper-atmospheric jet streams.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:366,&quot;335559738&quot;:1,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"The_Critical_In%EF%AC%82uence_of_the_Sub-Tropical_Westerly_Jet_STWJ\"><\/span><b><span data-contrast=\"none\">The Critical In\ufb02uence of the Sub-Tropical Westerly Jet (STWJ)<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:832,&quot;335559737&quot;:0,&quot;335559738&quot;:241,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:472,&quot;469777462&quot;:[832],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"auto\">The Sub-Tropical Westerly Jet (STWJ) is a year-round, high-altitude wind that \ufb02ows from west to east. Its interaction with the Himalayas and the Tibetan Plateau has a multifaceted and decisive impact on India&#8217;s weather patterns, controlling key phases of the monsoon cycle.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:303,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"The_Conflict_Thermal_Low_vs_Dynamic_High\"><\/span><b><span data-contrast=\"none\">The Conflict: Thermal Low vs. Dynamic High<\/span><\/b><span data-ccp-props=\"{&quot;335559685&quot;:1330}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"none\">During early summer, <\/span><span data-contrast=\"none\">the <\/span><span data-contrast=\"none\">land heats up, creating a <\/span><b><span data-contrast=\"none\">Thermal Low. <\/span><\/b><span data-contrast=\"none\">Ideally, this should pull in monsoon winds. However, the monsoon <\/span><span data-contrast=\"none\">is <\/span><span data-contrast=\"none\">delayed. Why?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1331,&quot;335559731&quot;:2,&quot;335559737&quot;:1600,&quot;335559738&quot;:165,&quot;335559740&quot;:235}\">\u00a0<\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"The_Blocking_Effect\"><\/span><b><span data-contrast=\"none\">The Blocking Effect<\/span><\/b><span data-ccp-props=\"{&quot;335559685&quot;:1330}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"none\">The Sub-Tropical <\/span><span data-contrast=\"none\">Westerly <\/span><span data-contrast=\"none\">Jet (STWJ) is bifurcated by the Himalayas. Its <\/span><b><span data-contrast=\"none\">Southern Branch <\/span><\/b><span data-contrast=\"none\">flows directly over the Northern Plains. This jet induces sinking air, creating a dynamic high-pressure system<\/span><b><span data-contrast=\"none\">\u00a0<\/span><\/b><span data-contrast=\"none\">that sits on top of the surface heat.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1333,&quot;335559737&quot;:1148,&quot;335559738&quot;:154,&quot;335559740&quot;:247,&quot;335559991&quot;:2}\">\u00a0<br \/><\/span><\/p>\r\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559739&quot;:0,&quot;335559740&quot;:247}\"> <img decoding=\"async\" class=\"wp-image-51674 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image11.jpeg\" alt=\"\" width=\"605\" height=\"560\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 605px; --smush-placeholder-aspect-ratio: 605\/560;\" \/><\/span> <br \/><b><span data-contrast=\"auto\">Blocking the Monsoon <\/span><\/b><span data-contrast=\"auto\">During the winter and spring, the STWJ is bifurcated by the Himalayan-Tibetan massif into a northern and a southern arm. The southern arm \ufb02ows south of the Himalayas, over the northern Indian plains. This upper-atmospheric \ufb02ow induces a <\/span><b><span data-contrast=\"auto\">&#8220;dynamic high pressure&#8221; <\/span><\/b><span data-contrast=\"auto\">at the surface. This high-pressure system is strong enough to counteract the thermal low-pressure that begins to form over the heating<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1080,&quot;335559738&quot;:1,&quot;335559740&quot;:276}\">\u00a0<\/span><span data-contrast=\"auto\">landmass, effectively blocking the Southwest Monsoon winds from entering India.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1219,&quot;335559738&quot;:1,&quot;335559740&quot;:276}\">\u00a0<\/span> <br \/><b><span data-contrast=\"auto\"><br \/>Triggering the Monsoon Burst <\/span><\/b><span data-contrast=\"auto\">As summer intensi\ufb01es, the STWJ gradually migrates northwards with the shifting of the global pressure belts. The critical event is when the southern arm moves far enough north to clear the Himalayas and merge with the northern arm. This northward shift removes the high-pressure block over the northern plains almost instantaneously. With the barrier gone, the warm, moist Southwest Monsoon winds\u2014which have been accumulating over the Arabian Sea\u2014are free to accelerate suddenly and surge into the subcontinent. This phenomenon is the <\/span><b><span data-contrast=\"auto\">&#8220;Monsoon Burst&#8221; <\/span><\/b><span data-contrast=\"auto\">or <\/span><b><span data-contrast=\"auto\">&#8220;sudden onset,&#8221; <\/span><\/b><span data-contrast=\"auto\">which typically makes its \ufb01rst appearance along the Malabar Coast of Kerala.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1140,&quot;335559738&quot;:241,&quot;335559740&quot;:276}\">\u00a0<br \/><\/span><\/p>\r\n<p><span data-ccp-props=\"{&quot;335559738&quot;:7}\"> <img decoding=\"async\" class=\"wp-image-51675 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image13.jpeg\" alt=\"\" width=\"619\" height=\"341\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 619px; --smush-placeholder-aspect-ratio: 619\/341;\" \/><\/span> <br \/><b><span data-contrast=\"auto\">Causing Monsoon Breaks: <\/span><\/b><span data-contrast=\"auto\">Even after the monsoon is established, the STWJ can continue to in\ufb02uence rainfall. The jet stream naturally has a meandering, wave-like path. During the rainy season, a signi\ufb01cant <\/span><span data-contrast=\"auto\">southward meander can cause its southern branch to temporarily re-establish itself over the northern plains. This reintroduces high<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:2105,&quot;335559738&quot;:1,&quot;335559740&quot;:276}\">\u00a0<\/span><span data-contrast=\"auto\">pressure, which weakens the monsoon circulation and can cause the rains to lessen or stop altogether for a period. These dry spells are known as <\/span><b><span data-contrast=\"auto\">&#8220;Monsoon Breaks&#8221; <\/span><\/b><span data-contrast=\"auto\">and, if prolonged, can lead to drought conditions.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:1,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<p><span data-ccp-props=\"{&quot;335559738&quot;:3}\"><img decoding=\"async\" class=\"wp-image-51676 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image15.jpeg\" alt=\"\" width=\"640\" height=\"366\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 640px; --smush-placeholder-aspect-ratio: 640\/366;\" \/> <\/span> <br \/><b><span data-contrast=\"auto\">Creating Winter Precipitation (Western Disturbances): <\/span><\/b><span data-contrast=\"auto\">In the winter, when the STWJ is \ufb01rmly positioned south of the Himalayas, its \ufb02ow is intercepted by the Pamir and Himalayan ranges. As it travels from west to east, the jet stream picks up moisture from sources like the Mediterranean Sea and the Persian Gulf. This moisture is then carried towards India, where the interaction with the mountains forces the air to rise, cool, and release precipitation. This results in light winter rains (approximately 6-10 cm) and snowfall in Northwest India (Kashmir, Punjab, Haryana) and parts of Northeast India (Assam, Arunachal Pradesh). This phenomenon is<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559740&quot;:276}\">\u00a0<\/span><span data-contrast=\"auto\">known as <\/span><b><span data-contrast=\"auto\">&#8220;Western Disturbances&#8221; <\/span><\/b><span data-contrast=\"auto\">and is critically important for the cultivation of winter (rabi) crops like wheat.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:360,&quot;335559731&quot;:0,&quot;335559737&quot;:1148,&quot;335559738&quot;:1,&quot;335559740&quot;:276}\">\u00a0<\/span> <span data-contrast=\"auto\">In summary, the upper-atmospheric jet streams, particularly the STWJ, exert profound and complex control over the entire annual weather cycle in India, from blocking the monsoon&#8217;s arrival to triggering its onset and even providing crucial winter precipitation.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1080,&quot;335559738&quot;:241,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"A_Consolidated_View_of_Jet_Stream_In%EF%AC%82uence_on_Indian_Monsoons\"><\/span><b><span data-contrast=\"none\">A Consolidated View of Jet Stream In\ufb02uence on Indian Monsoons<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:675,&quot;335559737&quot;:0,&quot;335559738&quot;:282,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:315,&quot;469777462&quot;:[675],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"auto\">A comprehensive understanding of the Indian monsoon requires synthesising the distinct but interconnected roles of multiple jet streams. These high-altitude wind systems elevate the monsoon from a simple surface-level phenomenon to a complex, three-dimensional atmospheric event. The three primary jet streams identi\ufb01ed as in\ufb02uencing the Indian monsoon are:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1290,&quot;335559738&quot;:297,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"4\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"1\"><b><span data-contrast=\"auto\">Tropical Easterly Jet (TEJ): <\/span><\/b><span data-contrast=\"auto\">Active during the summer and rainy season, the TEJ is directly linked to the intense heating of the Tibetan Plateau. Its primary function is to steer moisture-laden tropical depressions from the Bay of Bengal over the Indian subcontinent, sustaining rainfall during the monsoon season.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1080,&quot;335559737&quot;:1645,&quot;335559738&quot;:249,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1080],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"4\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><b><span data-contrast=\"auto\">Sub-Tropical Westerly Jet (STWJ): <\/span><\/b><span data-contrast=\"auto\">This is a key player throughout the year. Its position relative to the Himalayas is critical for blocking the monsoon&#8217;s entry, triggering the dramatic &#8220;monsoon burst,&#8221; causing dry spells known as &#8220;monsoon breaks,&#8221; and delivering vital winter precipitation through &#8220;Western Disturbances.&#8221;<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1080,&quot;335559737&quot;:1221,&quot;335559738&quot;:3,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1080],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"4\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"2\" data-aria-level=\"1\"><b><span data-contrast=\"auto\">Somali Jet Stream: <\/span><\/b><span data-contrast=\"auto\">This is an unusual, low-level jet stream, \ufb02owing at an altitude of only about 1.6 kilometres. It develops off the coast of Somalia and strengthens the Southwest Monsoon winds as they<\/span> travel across the Arabian Sea. The strength of the Somali Jet is positively correlated with good rainfall in India, making it an important component of the overall monsoon system.<span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1080,&quot;335559737&quot;:1148,&quot;335559738&quot;:1,&quot;335559740&quot;:276}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<p><span data-ccp-props=\"{&quot;335559738&quot;:2}\"><img decoding=\"async\" class=\"wp-image-51677 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image18.jpeg\" alt=\"\" width=\"630\" height=\"347\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 630px; --smush-placeholder-aspect-ratio: 630\/347;\" \/><\/span><span data-contrast=\"auto\"><br \/>Together, these jet streams demonstrate that the Indian monsoon is not merely a surface wind system. It is a deeply integrated atmospheric phenomenon, intricately linked to upper-tropospheric circulation patterns, which are themselves subject to in\ufb02uence from global-scale oscillations.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Global_Oscillations_and_Their_Impact_on_Monsoon_Variability\"><\/span><b><span data-contrast=\"none\">Global Oscillations and Their Impact on Monsoon Variability<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:675,&quot;335559737&quot;:0,&quot;335559738&quot;:282,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:315,&quot;469777462&quot;:[675],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"auto\">The Indian monsoon does not operate in isolation. Its year-to-year variability is signi\ufb01cantly in\ufb02uenced by larger-scale, periodic shifts in oceanic and atmospheric conditions that occur across the globe. These oscillations can dramatically alter the strength and timing of the monsoon,<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:297,&quot;335559740&quot;:278}\">\u00a0<\/span><span data-contrast=\"auto\">making prediction an exceptionally complex challenge. This section explores three critical global and regional oscillations.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:1,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"1_El_Nino_Southern_Oscillation_ENSO\"><\/span><b><span data-contrast=\"none\">1. El Ni\u00f1o Southern Oscillation (ENSO)<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:832,&quot;335559737&quot;:0,&quot;335559738&quot;:241,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:472,&quot;469777462&quot;:[832],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"auto\">ENSO is a major climatic driver originating in the tropical Paci\ufb01c Ocean, with two opposing phases\u2014El Ni\u00f1o and La Ni\u00f1a\u2014that have a strong inverse correlation with Indian monsoon rainfall.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:302,&quot;335559740&quot;:273}\">\u00a0<br \/><br \/><\/span> <span data-ccp-props=\"{&quot;335559738&quot;:9}\"> <img decoding=\"async\" class=\"wp-image-51678 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image20-1.jpeg\" alt=\"\" width=\"643\" height=\"350\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 643px; --smush-placeholder-aspect-ratio: 643\/350;\" \/><\/span><\/p>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">El Ni\u00f1o Conditions: <\/span><\/b><span data-contrast=\"auto\">An El Ni\u00f1o event is characterised by unusually warm sea surface temperatures in the central and eastern Paci\ufb01c Ocean. This warming weakens the atmospheric circulation pattern known as the Walker Cell. A weaker Walker Cell leads to a weaker Mascarene High-pressure system in the Indian Ocean. Since this high-pressure system is a primary driver pushing the monsoon winds towards India, its weakening results in a weaker monsoon, leading to less rain and a higher probability of <\/span><b><span data-contrast=\"auto\">droughts<\/span><\/b><span data-contrast=\"auto\">.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1080,&quot;335559737&quot;:1133,&quot;335559738&quot;:332,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1080],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">La Ni\u00f1a Conditions: <\/span><\/b><span data-contrast=\"auto\">A La Ni\u00f1a event is the opposite, characterised by cooler-than-average sea surface temperatures in the Paci\ufb01c. This strengthens the Walker Cell, which in turn strengthens the Mascarene High. A more powerful Mascarene High creates a stronger push of Southwest Monsoon <\/span><span data-contrast=\"auto\">winds toward India, often resulting in very good rainfall and an increased risk of <\/span><b><span data-contrast=\"auto\">\ufb02oods<\/span><\/b><span data-contrast=\"auto\">.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1080,&quot;335559737&quot;:1154,&quot;335559738&quot;:1,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1080],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<h3><span class=\"ez-toc-section\" id=\"2_Indian_Ocean_Dipole_IOD\"><\/span>2. <b><span data-contrast=\"none\">Indian Ocean Dipole (IOD)<\/span><\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"auto\">The IOD, sometimes referred to as the &#8220;Indian Ocean El Ni\u00f1o,&#8221; is a similar phenomenon of oscillating sea surface temperatures that occurs within the Indian Ocean itself. It is de\ufb01ned by the temperature contrast between the western Indian Ocean (Arabian Sea) and the eastern Indian Ocean.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:302,&quot;335559740&quot;:276}\">\u00a0<br \/><br \/><\/span> <span data-ccp-props=\"{&quot;335559738&quot;:12}\"> <img decoding=\"async\" class=\"wp-image-51679 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image22-1.jpeg\" alt=\"\" width=\"659\" height=\"355\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 659px; --smush-placeholder-aspect-ratio: 659\/355;\" \/><\/span><\/p>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">Positive Phase: <\/span><\/b><span data-contrast=\"auto\">This phase is characterised by a<\/span> warmer-than-average Arabian Sea and cooler waters in the east. The warmer water in the west enhances convection and moisture availability, leading to <b><span data-contrast=\"auto\">good rains <\/span><\/b><span data-contrast=\"auto\">in Western India.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1080,&quot;335559737&quot;:1148,&quot;335559738&quot;:1,&quot;335559740&quot;:276}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">Negative Phase: <\/span><\/b><span data-contrast=\"auto\">This phase involves a cooler-than-average Arabian Sea and warmer waters in the east. This condition suppresses convection near India, resulting in <\/span><b><span data-contrast=\"auto\">depressed rains <\/span><\/b><span data-contrast=\"auto\">and drier conditions, particularly in Western India.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1080,&quot;335559737&quot;:1224,&quot;335559738&quot;:1,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1080],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<h3><span class=\"ez-toc-section\" id=\"3_Madden-Julian_Oscillation_MJO\"><\/span>3. <b><span data-contrast=\"none\">Madden-Julian Oscillation (MJO)<\/span><\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"auto\">The MJO is a large-scale, eastward-moving system of regional convection that propagates along the equatorial belt. It operates on a shorter timescale than ENSO or IOD, with a periodicity of 30, 60, or 90 days. The MJO has two distinct phases as it passes over a region:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1298,&quot;335559738&quot;:302,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1298,&quot;335559738&quot;:302,&quot;335559740&quot;:276}\"><br \/><\/span> <span data-ccp-props=\"{&quot;335559738&quot;:12}\"><img decoding=\"async\" class=\"wp-image-51680 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image24.jpeg\" alt=\"\" width=\"605\" height=\"327\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 605px; --smush-placeholder-aspect-ratio: 605\/327;\" \/><\/span><\/p>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"3\"><span data-contrast=\"auto\">An <\/span><b><span data-contrast=\"auto\">enhanced rain phase <\/span><\/b><span data-contrast=\"auto\">associated with rising air and increased convection.<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"3\"><span data-contrast=\"auto\">A <\/span><b><span data-contrast=\"auto\">depressed rain phase <\/span><\/b><span data-contrast=\"auto\">associated with sinking air and suppressed convection.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1080,&quot;335559737&quot;:1292,&quot;335559738&quot;:1,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1080],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<p><span data-contrast=\"auto\">During the Indian summer, this system sometimes migrates northwards and can impact the monsoon. If the MJO&#8217;s enhanced phase passes over India, it can cause periods of <\/span><b><span data-contrast=\"auto\">heavy rain<\/span><\/b><span data-contrast=\"auto\">. Conversely, the arrival of its depressed phase can lead to breaks in the monsoon and potential <\/span><b><span data-contrast=\"auto\">droughts<\/span><\/b><span data-contrast=\"auto\">.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1219,&quot;335559738&quot;:241,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"4_Compounding_Factors_and_Prediction_Complexity\"><\/span><b><span data-contrast=\"none\">4. Compounding Factors and Prediction Complexity<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:832,&quot;335559737&quot;:0,&quot;335559738&quot;:243,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:472,&quot;469777462&quot;:[832],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"auto\">The interplay between ENSO, IOD, and MJO makes monsoon prediction exceptionally dif\ufb01cult. These systems can interact in complex and sometimes counterintuitive ways. For example, a year may be dominated by El Ni\u00f1o conditions, which would typically suggest a drought. However, the negative effects of El Ni\u00f1o can be countered if a <\/span><b><span data-contrast=\"auto\">positive IOD <\/span><\/b><span data-contrast=\"auto\">or an <\/span><b><span data-contrast=\"auto\">enhanced phase of the MJO <\/span><\/b><span data-contrast=\"auto\">occurs simultaneously. This combination can lead to unexpectedly good rains, highlighting the severe challenges in accurately forecasting monsoon performance. These complex interactions are the primary reason for the high degree of rainfall variability and manifest in India&#8217;s distinct seasonal weather patterns.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:302,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:0,&quot;335559740&quot;:276}\"> <img decoding=\"async\" class=\"wp-image-51681 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image27.jpeg\" alt=\"\" width=\"629\" height=\"338\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 629px; --smush-placeholder-aspect-ratio: 629\/338;\" \/><\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"The_Seasonal_Cycle_in_India\"><\/span><b><span data-contrast=\"none\">The Seasonal Cycle in India<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:675,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:315,&quot;469777462&quot;:[675],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"auto\">India&#8217;s seasons are uniquely de\ufb01ned by the monsoon system rather than by the sharp temperature variations typical of temperate climates. This is due to the moderating in\ufb02uence of the Himalayas, which block cold Central Asian winds, and the vast peninsular coastline, which tempers temperature extremes. As a result, India&#8217;s seasonal calendar is more appropriately categorised by monsoon-driven rainfall patterns, dividing the year into four distinct periods.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1092,&quot;335559738&quot;:297,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1092,&quot;335559738&quot;:297,&quot;335559740&quot;:276}\"><br \/><\/span> <img decoding=\"async\" class=\"wp-image-51682 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image29-1.jpeg\" alt=\"\" width=\"626\" height=\"350\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 626px; --smush-placeholder-aspect-ratio: 626\/350;\" \/> <br \/><b><span data-contrast=\"none\">1. The Dry Winters (Northeast Monsoon Season: Dec 15 &#8211; Mar 15).<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:832,&quot;335559737&quot;:0,&quot;335559738&quot;:249,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:472,&quot;469777462&quot;:[832],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span> <span data-contrast=\"auto\">This season is generally characterised by cold and dry conditions across most of the country. The prevailing winds are the offshore Northeast Trade Winds, which blow from the land to the sea and carry little moisture.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1080,&quot;335559738&quot;:302,&quot;335559740&quot;:273}\">\u00a0<\/span> <span data-contrast=\"auto\">However, three distinct regions receive rainfall during this otherwise dry period:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:8,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">Northwest and Northeast India: <\/span><\/b><span data-contrast=\"auto\">Precipitation in these regions is caused by <\/span><b><span data-contrast=\"auto\">Western Disturbances<\/span><\/b><span data-contrast=\"auto\">. The Sub-Tropical Westerly Jet (STWJ) carries moisture from the Mediterranean region, which is then intercepted by the Himalayas, causing light rain and snowfall.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1080,&quot;335559737&quot;:1406,&quot;335559738&quot;:0,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1080],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">Tamil Nadu \/ Coromandel Coast: <\/span><\/b><span data-contrast=\"auto\">Due to the unique southeastward orientation of this coastline, the Northeast Trade winds, after passing over the Bay of Bengal, become <\/span><b><span data-contrast=\"auto\">onshore winds<\/span><\/b><span data-contrast=\"auto\">. They pick up moisture from the Bay and bring signi\ufb01cant winter rainfall to this region, making it the primary rainy season for the Coromandel Coast.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1080,&quot;335559737&quot;:1082,&quot;335559738&quot;:2,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1080],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1169,&quot;335559738&quot;:204,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:359}\"> <img decoding=\"async\" class=\"wp-image-51683 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image31.jpeg\" alt=\"\" width=\"643\" height=\"352\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 643px; --smush-placeholder-aspect-ratio: 643\/352;\" \/><\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"The_Hot_Dry_Summers_Mar_15_%E2%80%93_Jun_15\"><\/span><b><span data-contrast=\"none\">The Hot, Dry Summers (Mar 15 &#8211; Jun 15)<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:832,&quot;335559737&quot;:0,&quot;335559738&quot;:319,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:472,&quot;469777462&quot;:[832],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><span data-contrast=\"auto\">This pre-monsoon season is marked by rapidly rising temperatures as the sun moves northwards.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:302,&quot;335559740&quot;:273}\">\u00a0<\/span> <span data-contrast=\"auto\">The intense heating of the subcontinent, especially the Tibetan Plateau, leads to the development of a strong low-pressure system.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:244,&quot;335559740&quot;:276}\">\u00a0<br \/><\/span><\/p>\r\n<p><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:0,&quot;335559740&quot;:276}\"> <img decoding=\"async\" class=\"wp-image-51684 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image33-1.jpeg\" alt=\"\" width=\"664\" height=\"354\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 664px; --smush-placeholder-aspect-ratio: 664\/354;\" \/><\/span> <br \/><span data-contrast=\"auto\">However, the southern branch of the STWJ remains positioned over the northern plains, creating a dynamic high-pressure block that prevents the moist oceanic winds from entering India. Consequently, this season remains predominantly hot and dry.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:322,&quot;335559740&quot;:276}\">\u00a0<\/span> <span data-contrast=\"auto\">This period is characterised by several local weather phenomena driven by intense surface heating:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:360,&quot;335559737&quot;:1148,&quot;335559738&quot;:242,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">Loo: <\/span><\/b><span data-contrast=\"auto\">A hot, dry, and dusty wind that blows across the Northern Plains, causing sharp increases in temperature.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1080,&quot;335559737&quot;:1896,&quot;335559738&quot;:241,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1080],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1080,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[9642],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"3\"><b><span data-contrast=\"auto\">Pre-Monsoon Thunderstorms: <\/span><\/b><span data-contrast=\"auto\">Localised and intense convectional heating can trigger brief but powerful showers, often accompanied by strong winds. These thunderstorms have distinct regional names:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1080,&quot;335559737&quot;:1118,&quot;335559738&quot;:1,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1080],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cb\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1800,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cb&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"0\" data-aria-level=\"4\"><b><span data-contrast=\"auto\">Kal Baisakhi: <\/span><\/b><span data-contrast=\"auto\">Occurring in Bihar and on the plains of Bengal.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1799,&quot;335559737&quot;:0,&quot;335559738&quot;:2,&quot;335559739&quot;:0,&quot;335559740&quot;:240,&quot;335559991&quot;:359,&quot;469777462&quot;:[1799],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cb\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1800,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cb&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"4\"><b><span data-contrast=\"auto\">Tea Showers: <\/span><\/b><span data-contrast=\"auto\">Bene\ufb01ting tea cultivation on the hills of Bengal and Assam.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1800,&quot;335559737&quot;:1292,&quot;335559738&quot;:57,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1800],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cb\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1800,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cb&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"2\" data-aria-level=\"4\"><b><span data-contrast=\"auto\">Blossom Showers: <\/span><\/b><span data-contrast=\"auto\">Aiding the blossoming of coffee plants in Karnataka.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1800,&quot;335559737&quot;:1431,&quot;335559738&quot;:1,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1800],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<ul>\r\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cb\" data-font=\"Arial\" data-listid=\"3\" data-list-defn-props=\"{&quot;134224900&quot;:false,&quot;335551671&quot;:0,&quot;335552541&quot;:1,&quot;335559685&quot;:1800,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Arial&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cb&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"3\" data-aria-level=\"4\"><b><span data-contrast=\"auto\">Mango Showers: <\/span><\/b><span data-contrast=\"auto\">Helping in the ripening of mangoes in Kerala.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:1800,&quot;335559737&quot;:2005,&quot;335559738&quot;:1,&quot;335559739&quot;:0,&quot;335559740&quot;:276,&quot;335559991&quot;:360,&quot;469777462&quot;:[1800],&quot;469777927&quot;:[0],&quot;469777928&quot;:[1]}\">\u00a0<\/span><\/li>\r\n<\/ul>\r\n<p><span data-ccp-props=\"{&quot;335559738&quot;:2}\"> <img decoding=\"async\" class=\"wp-image-51685 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image35.jpeg\" alt=\"\" width=\"637\" height=\"351\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 637px; --smush-placeholder-aspect-ratio: 637\/351;\" \/><\/span> <span data-ccp-props=\"{&quot;335559739&quot;:0}\"> <img decoding=\"async\" class=\"wp-image-51686 aligncenter lazyload\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2026\/10\/word_media_image37-1.jpeg\" alt=\"\" width=\"629\" height=\"344\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 629px; --smush-placeholder-aspect-ratio: 629\/344;\" \/><\/span><\/p>\r\n<h1><span class=\"ez-toc-section\" id=\"PYQs\"><\/span><span data-ccp-props=\"{&quot;335559739&quot;:0}\">PYQs <\/span><span class=\"ez-toc-section-end\"><\/span><\/h1>\r\n<p><span data-contrast=\"auto\">1. <\/span><span data-contrast=\"auto\">Critically evaluate the role of primate cities in dominating the urban spheres of influence in developing countries. (15 Marks\/2025) <br \/><\/span><span data-contrast=\"auto\">2. <\/span><span data-contrast=\"auto\">Write a short note on primate cities. (2008)<\/span><span data-ccp-props=\"{}\"> <br \/>3. <\/span><span data-contrast=\"auto\">In urban geography, what are the concepts of primate city and Rank Size Rule? Discuss in detail. (2006)<\/span><span data-ccp-props=\"{}\"> <br \/>4. <\/span><span data-contrast=\"auto\">Write a short note: Concept of primate city. (2005)<\/span><span data-ccp-props=\"{}\"> <br \/>5. <\/span><span data-contrast=\"auto\">Write a short note: Primate city. (1999)<\/span><span data-ccp-props=\"{}\"> <br \/>6. <\/span><span data-contrast=\"auto\">Short note: Rank- Size Rule. (2000)<\/span><span data-ccp-props=\"{}\"> <br \/>7. <\/span><span data-contrast=\"auto\">Discuss the concept of \u2018Rank-Size-Rule\u2019 given by G.K. Zipf. Is this rule relevant in the Indian context? (15 Marks\/2022)<\/span><span data-ccp-props=\"{}\"> <br \/>8. <\/span><span data-contrast=\"auto\">Analyse the measuring patterns of settlement in relation to the nearest Neighbour Index and Rank-Size Rule in detail. (15 Marks\/2026)<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"In_case_you_still_have_doubts_contact_us_at_9773890604\"><\/span><strong>In case you still have doubts, contact us at 9773890604<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>Enrol in Geography Optional by Shabbir Sir: <a href=\"https:\/\/edukemy.com\/upsc\/geography-optional-by-shabbir-sir-foundation-course\" target=\"_blank\" rel=\"noopener\">Here<\/a> <br \/>Enrol in One-on-One Personalised Mentorship: <a href=\"https:\/\/edukemy.com\/upsc\/prime-one-on-one-personalised-mentorship\" target=\"_blank\" rel=\"noopener\">Here<\/a> <br \/>Enrol in GS Mentorship Program: <a href=\"https:\/\/edukemy.com\/upsc\/gs-foundation-mentorship-program-led-by-shabbir-sir\">Here<\/a> <br \/>Enrol In GS Mains Mentorship Program<a href=\"https:\/\/edukemy.com\/upsc\/gs-mains-mentorship-program-led-by-shabbir-sir\" target=\"_blank\" rel=\"noopener\">: Here<\/a> <br \/>Explore One Integrated Platform for UPSC Prep: <a href=\"http:\/\/askyooki.com\" target=\"_blank\" rel=\"noopener\">Yooki<\/a> <br \/>Visit our YouTube Channel: <a href=\"https:\/\/www.youtube.com\/c\/Shabbir%E2%80%99sEduKemyforIAS\" target=\"_blank\" rel=\"noreferrer noopener\">Here<\/a> <span data-ccp-props=\"{}\">\u00a0<\/span> <span data-ccp-props=\"{}\">\u00a0<\/span> <span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559685&quot;:1440,&quot;335559737&quot;:366,&quot;335559738&quot;:243,&quot;335559740&quot;:276}\">\u00a0<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>The South Asian Monsoon: General Characteristics and Unique Features\u00a0 1. De\ufb01ning the Monsoon Phenomenon\u00a0 Before delving into the complex mechanisms that drive the Indian monsoon, it is essential to \ufb01rst&hellip;<\/p>\n","protected":false},"author":25,"featured_media":51715,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[4],"tags":[],"class_list":["post-51662","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"The South Asian Monsoon: General Characteristics and Unique Features 1. 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