Sri Vijaya Puram, July 25: Thunderstorm with gusty wind (30-40 kmph) and lightning is very likely to occur at one or two places over A&N Islands on July 26 & 27. Due to squally weather with surface wind speed reaching 35-45 kmph gusting to 55 kmph is very likely over Andaman Sea. Sea condition is likely to be rough. Fishermen have been advised not to venture into the sea along and off Andaman Sea till July 27.