Chennai, Kancheepuram, Tiruvallur, Cuddalore and Nagapattinam have bore the brunt of the monsoon fury, with torrential rains inundating low-lying areas. Nine people died across the state in the recent spell of heavy rain.
"I assure all possible support to the Tamil Nadu government to tackle the situation due to rains," Modi said at a function to celebrate the 75th anniversary of Tamil daily Dina Thanthi here.
"On landing in Chennai, PM @narendramodi discussed the situation arising due to heavy rains and floods in Chennai and other parts of Tamil Nadu with the CM (K Palaniswami) & Dy CM (O Panneerselvam) of the state. He assured them of all assistance from the Centre," @PMOIndia, the official twitter handle of Prime Minister's Office, said in a tweet.
The North-East monsoon, which set in on October 27, has been active over Tamil Nadu, with Chennai, Kancheepuram, Tiruvallur, Nagapattinam and Cuddalore districts receiving heavy rains since last week.
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S Balachandran, Director, Area Cyclone Warning Centre, told reporters that heavy to very heavy rains were likely in the next 24 hours in south Tamil Nadu, Cauvery delta districts and Karaikal.
The weather office also forecast occasional spells of rains for Chennai.
In the last 24 hours ending at 8.30 AM today, Parangipettai in Cuddalore district received 10.6 cm of rain. Puducherry recorded 10.2 cm of rainfall.