ONWR Issues Flash Flood Warning for Northern and Northeastern Thailand

The Office of the National Water Resources (ONWR) has released Announcement No. 1/2026, alerting residents and travelers to the risk of flash floods, forest runoff, and landslides across several regions in Thailand. According to the report by Prachachat Business, the warning is in effect from August 29 through September 2, 2026.

Meteorological forecasts indicate an increase in rainfall, with heavy to very heavy precipitation expected in many areas. The regions identified as being at the highest risk include the upper North, the upper Northeast, and the eastern provinces. The ONWR advises monitoring water levels closely, particularly in areas prone to overflowing banks and mudslides.

For residents and travelers, this weather pattern may lead to sudden disruptions in local transportation and outdoor activities in affected provinces. It is important to stay updated on local weather reports and follow instructions from provincial authorities if you are currently in or planning to visit these regions during the specified timeframe.

While the ONWR has identified the regions at risk, the exact intensity of the rainfall and the specific locations that will experience the most significant impact remain to be confirmed as the weather system develops. Travelers are encouraged to check local news sources for real-time updates before embarking on travel plans in the northern and northeastern parts of the country.