Port Blair, May 25: Heavy (7 to 11 cm) rainfall very likely to occur at isolated places over Andaman and Nicobar Islands in next three days. In view of onset of Southwest monsoon over some parts of Southeast Bay, of Bengal, South Andaman sea and Nicobar Islands, Strong Southwesterly wind speed between 35 and 45 kmph gusting to 55 kmph and rough to very rough seas very likely along and off Andaman & Nicobar coast. Fishermen are advised not to venture in to the sea during next 48 hours.