The rather strong southwest monsoon prevails over the andaman sea thailand and the gulf of thailand torrential rain and isolated heavy falls are likely over the country since2-3days heavy rainfalls have affected much of the south region leading to possible flash along foothills and waterways to be in effect for alert areas for provinces of chumphon ranong surat thani phangnga phuket krabi thang and satun during1-2 days wind-waves above2meters in the thundershower areas are likely in the andaman sea and the gulf of thailand all ships should proceed with caution during1-2days