The Regional Meteorological Centre predicted heavy rainfall in various south Bengal districts in the next 48 hours.
A low pressure trough that has formed over North Bay of Bengal will bring more rainfall. Warning of a rise in water levels of rivers in South Bengal owing to heavy rainfall in several districts till Friday was also issued.
Orange alert has been issued to various south Bengal districts which include Kolkata, Howrah, Hooghly, Bankura. The districts like Nadia, East Burdwan, West Burdwan and Birbhum will also receive heavy rainfall, MeT office said. The low pressure will gradually move towards Bangladesh.
The city and various south Bengal districts have been receiving scattered rainfall since Monday afternoon. A moderate rainfall lashed several parts of south Bengal late on Tuesday evening and also on Wednesday afternoon.
The situation will further intensify in the next 48 hours. The sky may remain mostly cloudy in various parts of south Bengal on Thursday.