More and heavier rainfall is expected in Cuddalore, Nagai, Thiruvarur, Thanjavur, Pudukottai, Tuticorin and Ramanathapuram, the director of Chennai’s Regional Meteorological Centre Balachandran said.
Locals have been advised to stock up on water and food supplies for the next few days.
Rescue forces including navy, coastguard and disaster response forces are also on high alert.