Thailand braces for floods and heavy rains amid monsoon trough
Flash floods and high waves threaten multiple regions nationwide
Heavy rain and rough seas are expected across Thailand as a monsoon system moves in, prompting warnings for residents and travellers to stay alert.
The Thai Meteorological Department (TMD) warned that residents in affected areas should be cautious of heavy to very heavy rainfall, which could lead to flash floods and overflows, particularly along foothills, near waterways, and in low-lying areas.
The wet weather is expected to be most intense in provinces like Rayong, Chanthaburi and Trat, with Bangkok not escaping the deluge.
Meanwhile, the seas are set to turn choppy. In the upper Andaman Sea and upper Gulf of Thailand, waves are forecast to reach 2 metres, surging higher during thunderstorms. The lower Andaman is expected to see waves of 1 to 2 metres, also rising above 2 metres during storms.
The TMD advised all ships to proceed with caution and avoid areas with thundershowers, urging both fishermen and tourists to remain vigilant.
The tropical storm Mitag, which had been hovering over Guangdong, China, has now weakened to a tropical depression and is expected to dissipate quickly. However, travellers are still advised to check local forecasts before setting out.
The weather forecast from 6am today, September 20, to 6am tomorrow, September 21, is as follows:
In North Thailand, fairly widespread thundershowers and isolated heavy rain are expected across several provinces including Mae Hong Son, Chiang Mai, Chiang Rai, Phayao, Nan, Lampang, Lamphun, Phrae, Tak, Sukhothai, Uttaradit, Kamphaeng Phet, Phitsanulok, Phichit, and Phetchabun. Temperatures will range from 22 to 25°C in the early hours and climb to 29 to 33°C during the day. Winds are expected to be variable at 5 to 15 km/hr.
In northeastern Thailand, scattered thundershowers and isolated heavy rain are forecast in Loei, Nong Khai, Bueng Kan, Nong Bua Lamphu, Udon Thani, Chaiyaphum, Khon Kaen, and Nakhon Ratchasima. Morning lows are predicted to fall between 23 and 25°C, with daytime highs reaching 31 to 33°C. Winds will remain variable between 10 and 15 km/hr.
For central Thailand, provinces including Nakhon Sawan, Uthai Thani, Lop Buri, Saraburi, Phra Nakhon Si Ayutthaya, Kanchanaburi, and Ratchaburi will experience fairly widespread thundershowers and isolated heavy rain. Temperatures will range from 23 to 25°C in the early morning and rise to between 32 and 34°C in the afternoon. Winds will be variable at 10 to 15 km/hr.
The eastern region will face fairly widespread thundershowers and isolated heavy rainfall, particularly in Nakhon Nayok, Prachin Buri, Chachoengsao, Chon Buri, Rayong, Chanthaburi, and Trat. Minimum temperatures will range from 23 to 27°C, with maximum temperatures between 31 and 34°C. Southwesterly winds will blow at speeds of 20 to 35 km/hr, with sea waves reaching about 2 metres, rising above 2 metres during thundershowers.
Along the southern east coast, scattered thundershowers are forecast, mainly in Phetchaburi, Prachuap Khiri Khan, Chumphon, and Surat Thani. Temperatures will dip to 23 to 25°C overnight and rise to 33 to 36°C during the day. Southwesterly winds will range from 15 to 35 km/hr. Wave height will be about 1 metre near the coast, 1 to 2 metres offshore, and exceeding 2 metres during thunderstorms.
On the southern west coast, scattered thundershowers and isolated heavy rain are likely in Ranong and Phangnga. Temperatures are expected to fall between 23 and 26°C at night and reach 30 to 34°C during the day. From Phangnga northwards, southwesterly winds will range from 20 to 35 km/hr, with waves around 2 metres, exceeding 2 metres in thunderstorm areas. From Phuket southwards, southwesterly winds of 15 to 35 km/hr will generate waves of 1 to 2 metres, also rising above 2 metres during thundershowers, according to the TMD.
In the Bangkok metropolitan area, scattered thundershowers and isolated heavy rain are expected throughout the day. Minimum temperatures will range from 25 to 27°C, while maximum temperatures could reach between 32 and 35°C. Southwesterly winds are expected at 10 to 15 km/hr.
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