A cyclonic circulation over the north Bay of Bengal triggered heavy rain in Gangetic West Bengal on Wednesday, the Met department said.
South Bengal districts, including Kolkata, have been receiving intermittent showers with heavy downpour at one or two places since Tuesday.
The cyclonic circulation over the north Bay of Bengal will bring heavy rain in Gangetic West Bengal in the southern part of the state till Thursday morning, the Met department said in its forecast.
Most of the districts in south Bengal are likely to receive heavy rain, accompanied by gusty wind with a speed limit of 30 to 40 km per hour, it said.
The sub-Himalayan districts of the state might also receive heavy rain till Thursday morning owing to an active monsoon trough, the Met said.
The river port town of Canning on the fringe of Sunderbans received the highest rainfall in West Bengal in 24 hours till 8.30am on Wednesday at 169mm, while Purulia and Burdwan towns received 32mm and 30mm rainfall during the same period.
Kalimpong in north Bengal received 33mm rain, while Darjeeling got 16mm rain during the period.