A red alert is issued for extremely heavy rain in Cuddalore and Mayiladuthurai on Wednesday, while Chennai remains under a yellow alert.

On November 27, light to moderate rain at many places with thunderstorms and lightning at one or two places is likely to occur over Tamil Nadu, Puducherry and Karaikal.

Heavy rainfall leads to a holiday for educational institutions on November 27, while CM Stalin reviews cyclone preparedness across affected districts.

The weather department predicted that the deep depression over the Bay of Bengal would turn into a cyclonic storm on November 27 and is expected to impact parts of Tamil Nadu.

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.

A deep depression in the Bay of Bengal is intensifying and expected to become a cyclonic storm, named Fengal, by November 27. It's currently southeast

The India Meteorological Department has issued a red alert for rain for Mayiladuthurai, Nagapattinam and Thiruvarur districts in Tamil Nadu and Karaikal in Puducherry.

Heavy rainfall led to waterlogging in various parts of Chennai city on November 26. Streets and roads were flooded with muddy water following heavy rainfall. India Meteorological Department (IMD) issued a yellow alert for heavy rainfall in Chennai from November 27 to 29.

Moving north-northwestwards at 12 km/h, the storm system is expected to bypass Sri Lanka’s coast and approach Tamil Nadu within the next two days. However, slightly cooler sea surface temperatures closer to the coastline could weaken the system marginally before landfall.