Sri Vijaya Puram, July 15: Heavy rain (07-11 cm) is very likely to occur at one or two places over Andaman Island and thunderstorm with gusty wind (30-40 kmph) and lightning is also very likely to occur at one or two places over Nicobar Island on July 16. Squally weather with surface wind speed reaching 35-45 kmph gusting to 55 kmph is very likely over South Andaman Sea. Sea conditions are likely to be rough. Fishermen have been advised not to venture into the sea along and off South Andaman Sea on July 18 and 19.