The Meteorological Department is warning people in the South to brace for more heavy rain that may trigger flash floods and overflows through until Saturday, with Tropical Storm Nesat expected to make landfall over upper Vietnam on Thursday or Friday.
The typhoon that was Nesat was downgraded to a tropical storm over the upper South China Sea around 7am on Wednesday. At 10am, the storm was about 400 kilometres east of Dong Hai in Vietnam and moving westward about 15kph through southern Hainan in China.
It was expected to make landfall over upper Vietnam on Oct 20-21 and then further degrade rapidly. Only isolated light rain was likely in upper Thailand.
From Oct 19-22, the monsoon trough would lie across the middle South and the southwesterly winds across the Andaman Sea and the South become stronger. This would cause heavy to very heavy rain in the South. Waves up to 2-3 metres high were expected in the Andaman Sea and more than 3 metres during thundershowers.
In the Gulf of Thailand, waves up to 1-2 metres were expected and more than 2 metres during thundershowers.
The department warned people living in the South to prepare for danger from heavy to heavy rain and accumulated rainfall that may cause flash floods and water courses to overflow.
For the western coast of the South, people were told to brace for inshore surges. All boats should proceed with caution and small boats should stay ashore.