Heavy rains hit the northern regions due to monsoon activity.
Thai Meteorological Department Issues Heavy Rain Warning for Northern and Northeastern Regions
On August 19, 2025, the Thai Meteorological Department (TMD) has forecasted heavy rain, particularly in the northern and northeastern regions of Thailand. This warning comes with alerts for flash floods and runoff near slopes and waterways in 25 provinces[2][5].
The monsoon trough has moved over the upper North, linking to a strong low-pressure system over the northern coast of Vietnam, causing the southwest monsoon to weaken[1].
Northern Region
In the northern region, thunderstorms are expected in about 40% of the area, with heavy rain in provinces such as Phayao, Nan, Uttaradit, and Tak[5]. Temperatures range from 23–25°C (min) up to 32–35°C (max), with southwesterly winds at 10–15 km/h[5].
Northeastern Region
The northeastern region is expected to experience fairly widespread rain with heavy rain in some areas, matching the alert for flash flood potential[2][5].
Central and Eastern Regions
In the central and eastern regions, scattered to fairly widespread thunderstorms with isolated heavy rain are expected. Temperatures range roughly from 23–37°C depending on the zone, with prevailing southwesterly winds around 10–20 km/h[3].
Sea Conditions
Waves in the upper Andaman Sea and upper Gulf of Thailand are mostly 1–2 meters high, about 1 meter in lower areas, but can exceed 2 meters in thunderstorm conditions. Mariners are cautioned to avoid sailing in stormy waters[1].
Caution for Residents
Residents in at-risk areas are urged to be cautious of flash floods and runoff, particularly in foothills, near waterways, and in low-lying areas[6].
The TMD's forecast was issued at 6am on Tuesday, August 19, for the 24 hours until 6am on Wednesday, August 19[4]. The TMD also issued a weather advisory for Tuesday, August 19, warning of heavy rainfall in several northern provinces[3].
Mariners are advised to exercise caution and avoid sailing in storm-affected zones. For the latest updates, residents and travellers are encouraged to check the TMD's website or local news sources.
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