Which of the following jet streams brings the western cyclonic disturbances in the northern part of India during the winter months?

Correct option is D

The correct answer is (d) Westerly Jet Stream

Explanation:

The Westerly Jet Stream is responsible for bringing Western Disturbances to northern India during the winter months.

These are extratropical storms that originate over the Mediterranean region and are carried towards the Indian subcontinent by these high-altitude westerly winds.

These disturbances cause rainfall in the north-western plains and snowfall in the Himalayan region during winters, which are crucial for Rabi crop irrigation.

Information Booster:

Western Disturbances:

• They are low-pressure systems.
• Travel from west to east, guided by upper-level westerlies (westerly jet stream).
• Due to unseasonal rainfall, hailstorms, and cold wave conditions.
• Important for the wheat crop in northwestern India.

Jet Streams:

• Narrow bands of fast-moving air in the upper levels of the atmosphere.
• They influence weather patterns across the globe.
• In India, the Subtropical Westerly Jet Stream becomes dominant during winter.

Additional Knowledge:

Easterly Jet Stream:

• Active during the summer monsoon.
• Associated with tropical easterlies.
• Does not bring winter disturbances.

Polar-Night Jet Stream:

• Located in the polar stratosphere during polar winter.
• Not directly linked to weather systems affecting India.

African Easterly Jet:

• Influences the climate of West Africa.
• Not connected with the Indian subcontinent's winter weather.

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