Heavy rain and flash flood warnings for northern Thailand

The Thai Meteorological Department (TMD) issued a weather warning today, indicating heavy rainfall across the northern regions, with 80% of the area expected to be affected. People are advised to be cautious of flash floods and sudden water surges.

The TMD’s 24-hour forecast predicts moderate southwesterly monsoon winds over the upper Andaman Sea, Thailand, and the upper Gulf of Thailand. Additionally, a low-pressure area is present over northern Vietnam.

These conditions are expected to result in heavy rain in the northern, upper northeastern, and eastern regions of Thailand. Residents in these areas are urged to be vigilant about potential heavy rain and accumulated rainfall, which could lead to flash floods and sudden water surges, particularly in foothill regions near waterways and low-lying areas.

In the upper Andaman Sea and the upper Gulf of Thailand, moderate wind conditions with waves of 1 to 2 metres high are expected. In areas with thunderstorms, waves could exceed 2 metres. Mariners in these regions are advised to navigate cautiously and avoid sailing in stormy conditions during this period.

Forecast for Thailand from 6am today to 6am tomorrow:

Northern region

Thunderstorms are expected in 80% of the area, with heavy rain in some parts, including Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Sukhothai, Phayao, Nan, Uttaradit, Tak, Phitsanulok, and Phetchabun provinces. Temperatures will range from 23 to 26 degrees Celsius at the lowest and 27 to 33°C at the highest. Southwesterly winds are expected at speeds of 5 to 15 kilometres per hour.

Northeastern region

Thunderstorms are expected in 70% of the area, with heavy rain in some parts, including Loei, Nong Khai, Bueng Kan, Udon Thani, Sakon Nakhon, and Nakhon Phanom provinces. Temperatures will range from 24 to 26°C at the lowest and 29 to 33°C at the highest. Southwesterly winds are expected at speeds of 10 to 20 kilometres per hour.

Central region

Thunderstorms are expected in 60% of the area, mainly in Nakhon Sawan, Chai Nat, Lopburi, Saraburi, Phra Nakhon Si Ayutthaya, Kanchanaburi, and Ratchaburi provinces. Temperatures will range from 24 to 27°C at the lowest and 31 to 34°C at the highest. Southwesterly winds are expected at speeds of 10 to 20 kilometres per hour.

Eastern region

Thunderstorms are expected in 60% of the area, with heavy rain in some parts, including Nakhon Nayok, Prachin Buri, Chon Buri, Rayong, Chanthaburi, and Trat provinces. Temperatures will range from 24 to 28°C at the lowest and 30 to 33°C at the highest. Southwesterly winds are expected at speeds of 15 to 35 kilometres per hour. The sea will have waves of 1 to 2 metres high, with waves exceeding 2 metres in areas with thunderstorms.

Southern region (East Coast)

Thunderstorms are expected in 60% of the area, mainly in Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala, and Narathiwat provinces. Temperatures will range from 24 to 26°C at the lowest and 32 to 36°C at the highest. Southwesterly winds are expected at speeds of 15 to 30 kilometres per hour. The sea will have waves about 1 metre high, with waves exceeding 2 metres in areas with thunderstorms.

Southern region (West Coast)

Thunderstorms are expected in 40% of the area, mainly in Ranong, Phang Nga, Trang, and Satun provinces. Temperatures will range from 23 to 26°C at the lowest and 32 to 34°C at the highest. From Phang Nga upwards, southwesterly winds are expected at speeds of 15 to 35 kilometres per hour, with waves of 1 to 2 metres high and exceeding 2 metres in areas with thunderstorms. From Phuket downwards, southwesterly winds are expected at speeds of 15 to 30 kilometres per hour, with waves about 1 metre high and exceeding 2 metres in areas with thunderstorms.

Bangkok and surrounding areas

Rain or thunderstorms are expected in 60% of the area. Temperatures will range from 26 to 28°C at the lowest and 32 to 34°C at the highest. Southwesterly winds are expected at speeds of 10 to 20 kilometres per hour, reported KhaoSod.