Cyclone Thane over the Bay of Bengal lay centred about 250 km east-southeast of Chennai and 270 km east of Puducherry.
Under the influence of the cyclone, isolated rain is predicted over north Tamil Nadu and Puducherry till Saturday afternoon. Rain is also predicted over south coastal Andhra Pradesh and Rayalaseema.
Squally winds with speed reaching 55-65 kmph gusting to 75 kmph are likely along and off north Tamil Nadu, Puducherry and south Andhra Pradesh coasts.
The wind speed will increase gradually, becoming 110-120 kmph gusting to 135 kmph along and off the coasts of north Tamil Nadu and south Andhra Pradesh from Thursday night, an IMD bulletin here said.
Fishermen along north Tamil Nadu, Puducherry and south Andhra Pradesh coasts have been advised not to venture into the sea till Saturday afternoon as the conditions will be rough.