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A depression over the Bay of Bengal is likely to intensify into a cyclonic storm and cross the north Tamil Nadu coast early on December 2, bringing heavy rainfall in its wake, the weather office said on Wednesday.
The cyclonic storm has been named 'Nada', S Balachandran, Director, Area Cyclone Warning Centre, told reporters here.
The weather office said the depression over the south-east of Bay of Bengal moved west-northwestwards and intensified into a deep depression and lay centred about 830 km of south-east Chennai, 780 km east-southeast of Puducherry and 490 km east-southeast of Trincomalee in Sri Lanka.
"The system is very likely to continue to move west-northwestwards and intensify further into a cyclonic storm (Nada) during next 12 hours. It is very likely to cross north Tamil Nadu coast between Vedaranyam and Chennai close to Cuddalore by early hours of December 2," it said.
Those out in the sea were advised to return immediately.
In the next 24 hours in Tamil Nadu beginning 0830 hrs on Wednesday, rains will commence along coastal parts and gradually move to inner districts, Balachandran said.
In Chennai, rains are expected to start early tomorrow morning and intensify gradually, he said, adding, spells of heavy to very heavy rain are likely in the city.