Sri Vijaya Puram, Oct. 27: Heavy rain (07-11 cm) is very likely to occur at one or two places over A&N Islands and thunderstorm with gusty wind (40-50 kmph) and lightning is also very likely to occur at one or two places over A&N Islands on Oct. 28, 29, 30 & 31. Squally weather with wind speed reaching 40-50 gusting to 60 kmph is likely to prevail over A&N Islands and Andaman Sea. Fishermen have been advised not to venture into the sea along and off A&N Coasts till Oct. 30.