Thai Met Dept Warns 22 Provinces of Heavy Rain, Flash Floods
The Thai Meteorological Department warns of heavy to very heavy rain across 22 provinces in the North and South, raising risks of flash floods and mountain runoff. Mountain peaks in the North have dropped to 9°C, while the Andaman Sea and Gulf of Thailand face waves up to 3 meters or higher during storms. Small boats are advised to stay in port, and residents in vulnerable areas should prepare for sudden flooding.
On November 12, 2026, the Thai Meteorological Department forecast heavy to very heavy rain in parts of the South over the next 24 hours. People in southern provinces are warned of dangers from thunderstorms, heavy downpours, and accumulated rainfall that could trigger flash floods and mountain runoff, particularly in foothill areas near waterways and drainage basins. The upper country continues to experience cool mornings, with scattered rain in the upper North. Residents in the upper regions should look after their health due to the cold, and farmers should protect crops from potential damage. A moderately strong high-pressure system or cold air mass covers upper Thailand and the South China Sea, while a westerly wind wave moves through Myanmar, upper Thailand, and upper Laos. The northeast monsoon prevails over the Gulf of Thailand, the South, and the Andaman Sea. Winds are strengthening over the Andaman Sea and the Gulf. The lower Gulf has waves 2-3 meters high, exceeding 3 meters in thundershowers. Mariners should proceed with caution and avoid thunderstorm areas. Small boats in the lower Gulf should remain in port. The forecast covers 06:00 today to 06:00 tomorrow. North: Cool mornings, temperatures dropping slightly, 30% chance of rain mostly in Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Nan, and Uttaradit. Low 16-22°C, high 23-31°C. Mountain tops cold at 9-15°C. Northwest winds 10-25 km/h. Northeast: Cool mornings, isolated light rain. Low 17-20°C, high 28-31°C. Hilltops cold at 10-14°C. Northeast winds 10-30 km/h. Central: Cool mornings, isolated light rain. Low 20-23°C, high 29-32°C. Northwest winds 10-25 km/h. East: Cool mornings, isolated light rain. Low 20-24°C, high 30-34°C. Northeast winds 15-30 km/h. Waves about 1 meter, over 1 meter offshore. South (east coast): Thundershowers covering 70% of the area with heavy rain in Phatthalung, Songkhla, Pattani, Yala, and Narathiwat; very heavy rain in Chumphon, Surat Thani, and Nakhon Si Thammarat. Low 22-24°C, high 28-32°C. From Surat Thani upward: East winds 15-35 km/h, waves 1-2 meters, over 2 meters in thundershowers. From Nakhon Si Thammarat downward: Southeast winds 20-40 km/h, waves 2-3 meters, over 3 meters in thundershowers. South (west coast): Thundershowers covering 60% of the area with heavy rain in Ranong, Phang Nga, Phuket, Krabi, Trang, and Satun.
