The West Bengal government on Saturday alerted six districts of the state after the Met office forecast that a deep depression in the Bay of Bengal, bringing heavy rains, was likely to cross the coastal areas this evening or Sunday morning.
Depression is equivalent to tropical storm in intensity and comprises large low-pressure centres and numerous thundershowers.
In a low-pressure centre, there is cloud formation and precipitation.
"The met office has forecast heavy rains during the next 24 hours. In the wake of the forecast we have alerted the administration in six districts," state Finance minister Asim Dasgupta told media persons.
The districts alerted include North and South 24-Parganas, East and West Midnapore, Purulia and Bankura, he said.
Irrigation embankments were damaged at six places in North and South 24-Paraganas following incessant rains overnight, the minister said.
Control rooms have been opened in the headquarters of all the six districts, along with one at the state secretariat here, to monitor the situation and take appropriate measures in case of an emergency.
Dasgupta said 30,000 pieces of tarpaulin have been sent to the six districts.
The depression in the northwest bay was lying 150 km south west near the sea resort of Digha in East Midnapore district and was likely to cross the state's coast this evening or tomorrow morning, the Met office said.