The Chennai Regional Meteorological Centre said a low-pressure area formed over the southwest Bay of Bengal off the Tamil Nadu coast at 5.30 am on October 21 and persisted over the same region at 8.30 am.
For today, extremely heavy to very heavy rainfall is likely in Thoothukudi, Tirunelveli and Kanniyakumari districts, the bulletin said.
Heavy rain is also expected at isolated places in Nilgiris, Coimbatore, Erode, Tiruppur, Namakkal, Karur, Theni, Dindigul, Tenkasi, Madurai, Virudhunagar, Thanjavur, Tiruvarur, Nagapattinam, Mayiladuthurai, Pudukkottai, Sivaganga and Ramanathapuram, and in Karaikal.
For October 22, heavy to very heavy rain may occur at isolated places in Thoothukudi, Tirunelveli, Kanniyakumari, Tenkasi, Virudhunagar, Ramanathapuram, Theni, Dindigul, Madurai, Coimbatore, Nilgiris, Sivaganga, Pudukkottai, Thanjavur, Tiruvarur, Nagapattinam and Mayiladuthurai, along with Karaikal. Heavy rain is also likely at isolated places in Tiruchirappalli, Erode, Ariyalur, Perambalur, Cuddalore, Namakkal, Villupuram, Tiruppur and Karur, and in Puducherry.
The weather office added that moderate rain is likely in the remaining districts, while Chennai may see moderate rain today and tomorrow.
