Chennai Deluge
- January 1, 2022
- Posted by: OptimizeIAS Team
- Category: DPN Topics
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Chennai Deluge
Subject – Geography
Context – Chennai deluge likely handiwork of winter weather system over North India
Concept –
- Chennai deluge is because of the resetting of the seasonal anticyclone over Rajasthan and its neighbourhood bringing its southern flanks to bear on the South Peninsula.
- The anticyclone with its clockwise movement of air establishes over North India to preside over the winter.
- The clockwise motion forces the air to sink to the ground level, and along with it, the chill that north-westerly winds from across the international border with Pakistan fetch.
- The recent spurt in western disturbance activity had forced this anticyclone to move south of its normal position – down to the latitude of Maharashtra, Telangana and North Karnataka.
- Its eastern flanks bore down heavy on the Bay of Bengal, suddenly altering the wind flows therein.
- The clockwise winds of the anticyclone worked up on the easterly to north-easterly flows of the North-East monsoon across the Bay.
- Late December also represents the fag-end of the North-East monsoon, but the overwhelming influence of the anticyclone on easterlies suddenly added a sting in its tail.