A total of 17 disaster response teams, comprising NDRF and state personnel, have been dispatched to vulnerable areas such as Chennai, Mayiladuthurai, Nagapattinam, Cuddalore and Thanjavur districts.

Schools in Tiruchirappalli, Nagapattinam, Mayiladuthurai, and Tiruvarur are closed in anticipation of heavy rains.

The IMD forecasts heavy to very heavy rainfall in coastal Tamil Nadu and Puducherry on November 27, with isolated areas receiving extremely heavy rainfall. The downpour is likely to persist from November 28 to 30,

A deep depression in the Bay of Bengal is likely to amplify into a cyclone, threatening Tamil Nadu. The Indian Coast Guard and state agencies are ensuring seafarers' safety, while the IMD predicts heavy rainfalls prompting school closures and exam postponements.

Rains lashed several parts of Tamil Nadu on Tuesday, and the India Meteorological Department said the depression over Bay of Bengal has formed into a deep depression and it is likely to intensify into a cyclonic storm on November 27.