Samui Harbour Office issued warnings to the ferry operator asking it to be careful in both directions on Surat Thani run with waves up high as 3 metres today, August 8, in Gulf of Thailand.
The office also prohibited small boats from leaving Samui Island. The ferry operator was warned to check all safety facilities and lifejackets on their boats.
Latest forecasts issued by Thai Meteorological Department said that the monsoon trough on Wednesday and Thursday would lie across upper North and upper north-east due to active low pressure over South China Sea, while strong southwest monsoon would prevail across Andaman Sea, as well as east through Gulf of Thailand.
Thai Meteorological Department warned that 2-3 metre high waves and strong winds were forecast in Andaman Sea, along with waves of around 2 metres high in upper Gulf, and above 3 metres in areas that experience thunderstorm cells.
The department warned that all ships should proceed with caution, while small boats should stay ashore.