The mercury in all the south Bengal districts will go up in the next 48 hours, said the Alipore Meteorological office on Tuesday.
Director of Alipur Met office GC Debnath said there would be a rise in temperature up 3 to 4 degrees Celsius.
Though thundercloud would be noticed in North and South Bengal and there may be rain in some pockets, the overall temperature will not go down. In Kolkata, the temperature was around 35 degree Celsius on Tuesday.
He issued the alert in Burdwan, Bankura, Purulia and Birbhum, where the temperature would be around 40 degree Celsius and above. People in these districts had been asked not to go out in the afternoon.
Meanwhile, doctors in the city said political workers and leaders campaigning in these districts should avoid noon. They should consume water and should use umbrella or cap during the campaign. Political meetings should be held after 4 pm. They said any one suffering from fever due to excessive heat should take rest. It is also advisable to use sunglasses when people go out of home. It may be mentioned that all political parties are giving umbrella to the workers who were taking part in the rallies.
It may be recalled that the consumption of electricity in Kolkata and its neighbourhood has gone up as more and more people are buying AC machines. The CESC had supplied additional power to meet the demand in March and it has predicted that the demand will further go up in April.