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What are jet streams ? How does it affect the climate of India

Jet streams are streams of air that flow horizontally through the upper layers of the troposphere from west to east direction. They flow at an altitude of 20,000-50,000 feet. Jet streams develop where air masses of differing temperatures meet. Greater difference in temperature means faster velocity of winds. The polar jets are the strongest jet streams followed by subtropical jets.

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Jet Streams are a narrow belt of high altitude westerly winds in the troposphere.

Jet streams blow south of the Himalayas, all through the year except in summer. The western cyclonic disturbances experienced in the north and north-western parts of the country are brought in by this westerly flow. In summer, the subtropical westerly jet stream moves north of the Himalayas with the apparent movement of the sun. The tropical easterly jet stream blows over peninsular India, approximately over 14°N during the summer months. Thus, it affects most part of Indian climate throughout the year.

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Jet streams are air currents found in the tropopause which is the transition between troposphere and stratosphere. These are westerly flows which blow south of the Himalayas, all through the year except in summer. The western cyclonic disturbances experienced in the north and north-western parts of the country are brought in by this westerly flow. In summer, the subtropical westerly jet stream moves north of the Himalayas with the apparent movement of the sun. An easterly jet stream, called the tropical easterly jet stream blows over peninsular India, approximately over 14°N during the summer months.

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