Safety
GISTDA Issues Flood Warning for Nan and Phrae Provinces
Thailand's space agency has warned of potential flash floods as water masses move from Pua District toward central and lower Nan, eventually reaching Phrae.
On August 19, 2026, the Geo-Informatics and Space Technology Development Agency (GISTDA) issued a flood alert based on satellite data and analysis from its 'Check Nam' (Check Water) application. The agency identified a high risk of flash floods and forest runoff originating in Pua District, Nan Province.
According to GISTDA’s predictive modeling, the water mass is expected to flow into the central and lower regions of Nan Province before continuing its path toward Phrae Province. The agency emphasizes that this satellite-based analysis is intended to provide residents with sufficient lead time to secure property, relocate vehicles, and ensure the safety of vulnerable family members and livestock.
For residents and travelers in these areas, the situation is evolving. GISTDA advises the public to remain calm but prepared, suggesting that individuals monitor the movement of the water in real-time via the 'Check Nam' application, which provides 24-hour updates. While the agency has provided a trajectory for the water mass, the exact impact on specific communities remains to be confirmed as the situation develops. Travelers planning to visit or transit through Nan or Phrae should exercise caution, stay informed through official channels, and be prepared for potential disruptions to local travel routes.