Sir Vijay Puram, Aug. 18: Thunderstorm with gusty wind (30-40 kmph) and lightning is very likely to occur at one or two places over Andaman & Nicobar Islands. Due to squally weather with surface wind speed reaching 35 to 45 kmph gusting to 55 kmph is very likely along and off Andaman Nicobar coast and over Andaman sea during next 24 hours and sea condition is likely to be rough to very rough. Fisherman have been advised not to venture in to sea along and off Andaman Nicobar coast and into Andaman sea during next 24 hours.