NEW DELHI: On Friday, a depression over the southwest Bay of Bengal headed north-northwestwards towards the coast of Tamil Nadu, where it is expected to develop into a deep depression, delivering rainfall to the state's and neighbouring Andhra Pradesh's coastal areas.

"During the early hours of Friday morning, the depression over southwest Bay of Bengal moved north-northwestwards at a speed of about 15 kmph and lay centred at 8.30 a.m about 180 kilometres east of Trincomalee (Sri Lanka), 390 kilometres southeast of Nagappattinam (Tamil Nadu), 470 kilometres southeast of Puducherry (Tamil Nadu), and about 530 kilometres south-southeast of Chennai (Tamil Na

During the next 12 hours, it is expected to deepen further into a deep depression, move north-northwestwards off the east coast of Sri Lanka till March 5 am, and then move west-northwestwards towards the north Tamil Nadu Coast during the next 48 hours.

Later on Friday, light to moderate rainfall or isolated thundershowers are likely over coastal Tamil Nadu, Puducherry & Karaikal, south coastal Andhra Pradesh, and Rayalaseema, followed by similar light to moderate rainfall, thundershowers at a few places, and isolated heavy rainfall over north coastal Tamil Nadu, Puducherry & Karaikal on Saturday.

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