Question

What is western disturbance

Answer 1

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

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Answer 2

Explanation:

• : Western Disturbances are low-pressure systems (temperate cyclones) embedded in the Westerlies, the planetary winds that flow from west to east between 30o - 60o latitude. These generally originate in the Mediterranean region and travel over Iran, Iraq, Afghanistan and Pakistan to enter India loaded with moisture. The frequency of these systems reaching India increases during winter with the southward shift of pressure belts (with the apparent movement of sun towards the tropic of cancer).

These disturbances generally lead to

Mild rain during winter (beneficial to the rabi crop)

• Snowfall in Western Himalayas
• Cold wave in the region
• Sometimes hail formation

• These disturbances generally affect North-west India but occasionally their effects go farther east and south (upto Central India). But in the recent past, it is observed that this beneficial weather phenomenon is increasingly becoming disastrous. The cloud burst in Leh in 2010, the floods and landslide in Uttarakhand in 2013 and the excessive rain in J&K in 2014 were all linked to these disturbances.