Chiang Mai issues urgent flood alert as heavy rain forecast through 1st June

 | Fri 29 May 2026 16:00 ICT
Chiang Mai’s Disaster Prevention and Mitigation Office has issued an urgent alert to all 25 districts, warning of heavy to very heavy rainfall forecast from 28th May to 1st June, with risks of flash floods, forest runoff and waterlogging across multiple vulnerable areas.

Deputy Governor Siwakorn Buapong has ordered round-the-clock monitoring of high-risk zones, with immediate closure of natural attractions — including caves, waterfalls and cave passages — if conditions are deemed dangerous. No entry by residents or tourists will be permitted in closed areas. Temporary shelters, food, drinking water and essential supplies are to be prepared in readiness for emergency deployment.

For this rainy season, Chiang Mai has activated CMFlood, an urban flood warning system developed by Chiang Mai University in partnership with allied agencies. The system was introduced following the province’s major flood in 2024, when water levels at the Ping River’s P.1 station reached 5.30 metres, affecting residents across a wide area. CMFlood provides real-time monitoring, advance situation forecasting and early warnings through an online platform, supporting both authorities and the public in flood preparedness and damage mitigation.

The system also incorporates Flood Mark indicators showing maximum recorded water levels, allowing residents to assess risk in their own areas. A five-level flood risk map — covering scenarios where the P.1 station reads between 4.30 and 5.30 metres — has been published on the CMFlood platform and is available at watercenter.cmu.ac.th/chiangmai/cmflood/warning.​​​​​​​​​​​​​​​​