Sri Vijaya Puram, Sept. 14: Heavy rain (07-11 cm) is very likely to occur at one or two places over A&N Islands and thunderstorm with gusty wind (30-40 kmph) and lightning very likely to occur at one or two places over A&N Islands on Sept. 17, 18 & 19. Due to squally weather with surface wind speed reaching 35-45 kmph gusting to 55 kmph is very likely to prevail over Andaman Sea & A&N coast. Sea condition is also likely to be rough. Fishermen have been advised not to venture into the sea along and off Andaman Sea & A&N coast on Sept. 18.