Q99. Consider the following statements:
- Jet streams occur in the Northern Hemisphere only.
- Only some cyclones develop an eye.
- The temperature inside the eye of a cyclone is nearly 10°C lesser than that
of the surroundings.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 2 only
(d) 1 and 3 only
Answer: C
- Statement 1 is not correct: Jet Stream is a geostrophic wind blowing horizontally through the upper layers of the troposphere, generally from west to east, at an altitude of 20,000 – 50,000 feet. Jet Streams develop where air masses of different temperatures meet. So, usually, surface temperatures determine where the Jet Stream will form. The greater the difference in temperature, the faster the wind velocity inside the jet stream. Jet Streams extend from 20° latitude to the poles in both hemispheres.
- Statement 2 is correct: The hurricane’s center is a relatively calm and clear area of sinking air and light that usually do not exceed 15 mph (24 km/h) and is typically 20- 40 miles (32-64 km) across. An eye will usually, develop when the maximum sustained wind speeds go above 74 mph (119 km/h) and is the calmest part of the storm
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