"Heavy rainfall along with moderate thunderstorm and lightning are very likely to occur at isolated places in the districts of East Midnapore, North 24 Parganas, South 24 Parganas and Kolkata till tomorrow," a Met department bulletin said.
Districts of Gangetic West Bengal are also likely to experience isolated heavy rainfall on Saturday and Sunday.
Sub-Himalayan districts of Darjeeling, Kalimpong, Jalpaiguri, Coochbehar and Alipurduars are also likely to receive heavy rainfall till tomorrow, following which rainfall in the region would decrease for the next few days, the Met department said.