Tomorrow also heavy rains are very likely at isolated places over Bihar, Assam and Meghalaya, Nagaland, Manipur, Mizoram and Tripura and Konkan and Goa, it said.
The rains, which began on Sunday night, continued on Monday, throwing normal life off gear on the first working day of the week.
Asansol, Raniganj and Durgapur experienced heavy rain and squally winds, which have led to many trees being uprooted and waterlogging at some places.
Owing to the inclement weather up and down Asansol-Tata Express, Andal-Jasidih Passenger and Jasidih-Banka Passenger had to be cancelled and some mail/express trains were delayed enroute, he said.
The situation in the districts of Howrah, Hooghly, Burdwan and Birbhum, Bankura and Purulia was no better.
The system is very likely to continue to move west-northwestwards and weaken into a depression during next 06 hours & into a well marked low pressure area during subsequent 24 hours.
"The city received 123 mm of rain in the last 24 hours till 5.30 p.m.", Director of the Regional Meteorological Centre, Kolkata, G.K. Das, said.
Fishermen have been advised not to venture into the sea during the same period. Several long distance trains, including Punjab mail, and Coalfield Express, were held up on the way.
Twenty-six domestics flights were diverted to Silchar, Ranchi, Agartala, Patna, Bhubaneswar airport.
According to the weather office, the rainfall is resulting from a deep depression which formed over the Gangetic West Bengal and adjoining north Bay of Bengal.
Under its influence, rainfall will occur at most places over Gangetic West Bengal, north Odisha and east Jharkhand, with heavy to very heavy precipitation at isolated places in these areas, the MeT department said in its forecast till Wednesday morning. The rains were triggered by a depression that hit Kolkata and Gangetic Bengal early on October 9.