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Which of the following reason of rainfall during winters in north-western part of India?

A Western Disturbance is an extratropical storm originating in the Mediterranean region that brings sudden winter rain to the northwestern parts of the Indian subcontinent. It is a non-monsoonal precipitation pattern driven by the westerlies.

Ans: Western Disturbance 

It is originates over the Mediterranean Sea and the Atlantic Ocean.Western Disturbances are important for the development of the Rabi crop, which includes the locally important staple wheat.

Western disturbances are usually associated with cloudy sky, higher night temperatures and unusual rain. Excessive precipitation due to western disturbances can cause crop damage, landslides, floods and avalanches. Over the Indo-Gangetic plains, they occasionally bring cold wave conditions and dense fog. These conditions remain stable until disturbed by another western disturbance. When western disturbances move across northwest India before the onset of monsoon, a temporary advancement of monsoon current appears over the region.

Source: wikipedia
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