Thailand faces widespread thunderstorms and localised heavy rain today, August 22, with the Thai Meteorological Department warning of flash flood risk in the North, Central and Eastern regions. A monsoon trough stretching across upper Laos and into a depression over Hainan Island, China, combined with a strengthening southwest monsoon over the Andaman Sea, is driving the wet conditions.
The Thai Meteorological Department (TMD) urged residents in affected areas to watch for flash floods, runoff from higher ground and overflowing waterways, particularly near foothills and low-lying land.
North
Sixty percent of the region can expect thunderstorms, with heavy rain possible in Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Kamphaeng Phet, Phitsanulok, Phetchabun and Tak. Temperatures will range from 22°C to 26°C at the low end and 31°C to 34°C at the high end, with southwest winds of ten to twenty kilometres an hour.
Northeast
Forty percent of the region will see thunderstorms, with heavy rain possible in Nong Khai, Bueng Kan and Nakhon Phanom. Lows will sit between 23°C and 24°C, highs between 31°C and 33°C, with southwest winds of ten to twenty kilometres an hour.
Central
Sixty percent of the region faces thunderstorms, with heavy rain possible in Nakhon Sawan, Uthai Thani, Ratchaburi and Kanchanaburi. Temperatures will range from 23°C to 25°C at the low end and 32°C to 34°C at the high end, with southwest winds of ten to twenty five kilometres an hour.
East
Sixty percent of the region will see thunderstorms, with heavy rain possible in Nakhon Nayok, Prachin Buri, Chanthaburi and Trat. Lows will range from 23°C to 27°C, highs from 31°C to 33°C, with southwest winds of twenty to thirty five kilometres an hour. Sea waves will reach around two metres, rising above two metres in thunderstorm areas.
South East Coast
Thirty percent of the region can expect thunderstorms, mostly in Phetchaburi, Prachuap Khiri Khan, Chumphon and Surat Thani. Temperatures will range from 23°C to 25°C at the low end and 30°C to 37°C at the high end.
From Surat Thani northward, southwest winds of twenty to thirty five kilometres an hour will bring waves of one to two metres, rising to around two metres further offshore and above two metres in thunderstorm areas. From Nakhon Si Thammarat southward, winds of fifteen to thirty five kilometres an hour will bring waves of around one metre, rising to one to two metres offshore and above two metres in thunderstorm areas.
South West Coast
Thirty percent of the region faces thunderstorms, with heavy rain possible in Ranong. Lows will range from 22°C to 25°C, highs from 30°C to 35°C.
From Phang Nga northward, southwest winds of twenty to forty kilometres an hour will bring waves of two to three metres, rising above three metres in thunderstorm areas. From Phuket southward, winds of fifteen to thirty five kilometres an hour will bring waves of one to two metres, rising above two metres in thunderstorm areas.
Bangkok and Vicinity
Sixty percent of the area will see thunderstorms. Lows will range from 25°C to 26°C, highs from 32°C to 33°C, with southwest winds of ten to twenty five kilometres an hour.
Sea Conditions
The upper Andaman Sea will see fairly strong winds and waves of two to three metres, rising above three metres in thunderstorm areas. The upper Gulf of Thailand will see waves of around two metres, rising above two metres in thunderstorm areas. Sailors in both areas were advised to navigate with caution and avoid thunderstorm zones, while small boats in the upper Andaman Sea were told to stay ashore for now.
Separately, the depression over Hainan Island is expected to strengthen into a tropical storm and make landfall in southern Guangxi province, China, around August 24 to 25. The storm is not expected to track into Thailand or directly affect the country’s weather, though the Thai Meteorological Department advised anyone travelling to the region during that period to check conditions before departure.
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