Question

What are jet stream? How do they affect climate of India?

Answer 1

The jet stream is a core of strong winds around 5 to 7 miles above the Earth’s surface, blowing from west to east. Wind speeds can exceed 200 mph but we don’t see or feel this at ground level. Instead, this part of the atmosphere helps develop and steer weather around the globe, sometimes bringing storms, sometimes bringing very calm and settled days.The westerly jet streams are responsible for bringing western cyclonic disturbances to north west India resulting in rainfall in winters.The easterly jet stream blowing over north India result in the creation of tropic depressions. The latter play a significant role in the distribution of rainfall in the country.

Answer 2

Answer : Jet streams are a narrow belt of high altitude (above 12000 m) westerly winds in the troposphere.

a) Their speed varies from about 110 km/h in summer to about 184 km/h in winter.

(b) A number of separate jet streams have been identified.

(c) The most constant are the mid latitude and subtropical jet streams.

(d) Jet streams over the Indian peninsula during the summer affect the monsoon.

(e) The subtropical westerly jet stream blow south of the Himalayas and is responsible for the western cyclonic disturbances experienced in the north and north western parts of the country.

(f) An easterly jet stream blows over peninsular India. It affects the coastal regions of the country and is responsible for tropical cyclones during the monsoon as well as during the October to November period.


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