The depression over central Bay of Bengal moved north-northeastwards with a speed of 16kmph on Friday and lay centred at 11.30am on Friday, over east-central Bay of Bengal near latitude 15.8°N and longitude 88.9°E, around 700km south-southwest of Khepupara (Bangladesh), about 660km south-southeast of Sagar Islands (West Bengal) and 710km south of Canning (West Bengal).
There are high chances of it continuing to move north-northeastwards and intensifying into a cyclonic storm over east-central Bay of Bengal by Saturday. Subsequently, it would move nearly northwards, intensify into a severe cyclonic storm by Saturday night. Continuing to move nearly northwards, it is very likely to cross Bangladesh and adjoining West Bengal coasts between Sagar Islands and Khepupara around Sunday midnight as a severe cyclonic storm.
Rainfall forecast for south Bengal
There are high chances of light to moderate rainfall at many places over the districts on Saturday and moderate rainfall at most places over the districts on Sunday and Monday.
Saturday
Yellow warning (rainfall) was issued for one or two places over North- and South 24-Parganas and Purba Medinipur districts.
Sunday
Red warning (rainfall) was issued for one or two places over North- and South 24-Parganas districts. Heavy to very heavy rain (12 - 20 cm) is likely at one or two places over Kolkata, Howrah, Hooghly, Nadia and Purba Medinipur districts.
Yellow warning has been sounded for heavy rain (7-11 cm) at one or two places in Paschim Medinipur and Purba Bardhaman districts.
Monday
Orange warning issued for heavy (7–11 cm) to very heavy rain (12 - 20 cm) at one or two places over North- and South 24-Parganas, Kolkata, Nadia, Hooghly, Howrah and Murshidabad districts.
Yellow warning for heavy rain (7-11 cm) at one or two places over Purba and Paschim Bardhaman, Birbhum, Purba and Paschim Medinipur districts.
Wind warning
Saturday
Thunderstorm with gusty wind speed reaching 40 to 50 kmph likely over North and South 24 Parganas and East Midnapore districts and reaching 30 to 40 kmph likely over rest of the districts.
Sunday to Monday
Thunderstorm with wind speed reaching 100 to 110kmph gusting to 120kmph likely over South 24-Parganas; reaching 90 to 100kmph gusting to 110kmph likely over North 24 Parganas; reaching 80 to 90kmph gusting to 100 kmph likely over Kolkata, Howrah, Nadia, East Midnapore; reaching 60 to 70kmph gusting to 80kmph likely over Hooghly, East Bardhaman; reaching 40-50 kmph gusting to 60 kmph likely over rest of the districts.
.