The Indian Meteorological Department (IMD), Thiruvananthapuram, on Monday said the southwest monsoon had withdrawn from the entire country.
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In a press release, the IMD stated, "In view of a significant reduction in rainfall activity over most parts of the country, the southwest monsoon has withdrawn from the entire country on Monday, October 25, 2021."
The release further said," Simultaneously with the setting in of northeasterly winds in the lower tropospheric levels, the northeast monsoon rain have commenced over extreme south peninsular India on Monday, October 25, 2021."

"A cyclonic circulation is likely to develop over Southeast Bay of Bengal and neighbourhood by Tuesday (October 25). It is likely to move westwards. Under its influence, a low-pressure area is likely to form over central parts of South Bay of Bengal during subsequent 48 hours," said the release.
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The Met office has warned of thunderstorms and lightning over Kerala, Mahe, Tamil Nadu, Karaikal and Puducherry till the end of this week. In particular, heavy rainfall (64.4 mm to 115.5 mm in 24 hours) has been forecast for Kerala, Tamil Nadu, Karaikal and Puducherry till Tuesday.

Normally, the southwest monsoon withdraws completely by October 15, after which the monsoon winds reverse their direction and align along the northeast direction.
-PTC News