Frequent spells of rain and thundershowers at many places are likely over Bankura, Bardhaman, Birbhum, East Midnapore, Hooghly, Howrah, Kolkata, Murshidabad, Nadia, North 24 Parganas, South 24 Parganas and West Midnapore districts of West Bengal with strong average winds of 50 kmph gusting at 80 kmph during the next 4 to 8 hours.