The warning follows the latest advisory issued by the Southern Meteorological Centre (West Coast), which warned that a relatively strong southwest monsoon covering the Andaman Sea and Thailand’s west coast will continue to bring heavy to very heavy rain across the region through June 4.
Officials warned that Phuket, Krabi and Trang could experience heavy rain in many areas, while the highest risk of very heavy rainfall remains in Ranong and Phang Nga.
The weather office cautioned that persistent rainfall may trigger flash floods, runoff and landslides, particularly in foothill areas, near waterways and in low-lying locations.
Sea conditions are also expected to remain dangerous during the warning period.
Waves in the upper Andaman Sea, including waters off Phuket, are forecast at two to three metres, rising above three metres in areas experiencing thunderstorms. Small boats have been advised to remain ashore, while all vessels have been urged to navigate with caution and avoid storm areas.
Less than an hour of intense rainfall yesterday afternoon caused flooding in several locations, particularly along Chao Fa East Rd and in the Phuket Villa 3 area of Wichit, both prone to flooding during heavy downpours.
Water accumulated on road surfaces in several areas, slowing traffic and creating hazardous driving conditions. Although most roads remained passable, motorists were forced to reduce speed because of slippery surfaces, standing water and reduced visibility.
Long traffic queues were reported on sections of Chao Fa East Rd as vehicles moved slowly through flooded areas.
Local authorities deployed crews to monitor the situation and accelerate drainage efforts in flood-prone locations as water levels gradually subsided.
In response, the Phuket Provincial Disaster Prevention and Mitigation Office (DDPM Phuket) ordered district offices, municipalities and other agencies to remain on alert through June 4, with personnel, machinery and emergency equipment placed on standby. Officials have also been instructed to closely monitor flood-prone and landslide-risk areas and issue warnings as conditions change.
Authorities were also instructed to close or restrict access to natural attractions if conditions pose a risk to public safety.
Local authorities have been directed to install warning signs, warn tourists against entering the sea during dangerous conditions and alert boat operators to deteriorating weather.
Officials may prohibit boats from leaving shore if sea conditions worsen.
Agencies have also been ordered to activate water pumps before water reaches critical levels and deploy additional pumps where needed.
Officials have also been ordered to maintain 24-hour monitoring in areas vulnerable to flash floods and landslides, with residents in low-lying communities advised to move valuables to higher ground and prepare for possible evacuation if conditions deteriorate.
Residents have been urged to monitor weather updates, avoid flooded routes and exercise caution during periods of heavy rain.
People requiring emergency assistance can contact the DDPM hotline at 1784.