TMD Warning No. 4: Heavy Rain and Flash Flood Risks in 31 Provinces

Khaosod•Society•21d ago

Reader Briefing

The Thai Meteorological Department warns 31 provinces of heavy to very heavy rainfall and flash floods from August 6 to 9, 2026.

•The Thai Meteorological Department issued Warning No. 4 (146/2026) on August 5, 2026.
•Heavy to very heavy rain is expected in the Northern, Northeastern, and Eastern regions, with heavy rain in the Central region, Bangkok, its vicinity, and the Southern region.
•The warning period for the impact is from August 6 to 9, 2026.
•Small boats are advised to avoid leaving shore in the upper Andaman Sea and upper Gulf of Thailand during this period.

•The Thai Meteorological Department issued the warning at 17:00 on August 5, 2026.
•Heavy rain is caused by a monsoon trough passing through upper Northern and upper Northeastern Thailand, combined with a strong southwest monsoon.
•The Thai Meteorological Department warns of flash floods and forest runoff, particularly in slope areas near waterways and low-lying areas.
•Wave heights in the upper Andaman Sea are expected to be 2-4 meters, and over 4 meters in thunderstorm areas.
•Wave heights in the upper Gulf of Thailand are expected to be 2-3 meters, and over 3 meters in thunderstorm areas.
•The Thai Meteorological Department advises sailors in the Andaman Sea and Gulf of Thailand to navigate with caution and avoid thunderstorm areas.
•Small boats in the upper Andaman Sea and upper Gulf of Thailand should refrain from leaving shore between August 6 and 9, 2026.
•The Thai Meteorological Department will issue the next announcement on August 6, 2026, at 05:00.

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Thai Meteorological Department(กรมอุตุนิยมวิทยา)ℹ️

The government agency issuing weather warnings and monitoring meteorological data.

Andaman Sea(ทะเลอันดามัน)ℹ️

A sea area where strong winds and high waves are expected.

Gulf of Thailand(อ่าวไทย)ℹ️

A sea area where strong winds and high waves are expected.

Bangkok(กรุงเทพมหานคร)ℹ️

An area expected to experience heavy rainfall.