Heavy to very heavy rain have been forecast in districts of south Bengal, with the intensity likely to be more in the coastal districts of East Midnapore, South 24 Parganas and North 24 Parganas.
The well-marked low pressure area over northwest Bay of Bengal and adjoining West Bengal and Odisha coasts is likely to concentrate into a depression during the next two days, regional Met director G K Das said.
Fishermen have been advised not to venture into the sea till July 22.
The metropolis, which has been experiencing sweltering heat for the last few days, is likely to receive heavy rain tomorrow and a few spells of rain thereafter, Das said.
Kolkata recorded the day's highest temperature at 36.1 degree Celsius yesterday, which is three notches above normal, while the minimum temperature was two counts above average at 28.5 degree Celsius.
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