The government is closely monitoring the Nan River basin situation as water levels begin to ease, preparing to respond to rainfall expected on 23 August, and implementing continuous measures to protect the public.
On 22 August 2026, Ms. Lalida Pertvivattana, Deputy Spokesperson of the Prime Minister's Office, stated that the government continues to track flooding in Nan province as water levels in many areas have stabilized and started to recede. Preparations are underway to manage expected rainfall returning to the upper Nan River basin on 23 August 2026, with close monitoring of rainfall, water volume, and terrain conditions to ensure timely alerts and assistance to residents.
The Deputy Spokesperson said that according to the National Water Resources Office's assessment, the upper Nan River basin areas to watch on 23 August include Pua, Song Kwae, Chiang Klang, and Thung Chang districts, where rainfall accumulation in 24 hours is estimated at about 50–70 millimeters. Although this forecasted rainfall is not as intense as previous heavy rains, some areas still have saturated soil from prior precipitation, so relevant agencies remain vigilant.
"Even though this rain event is expected to be less intense than before, the saturated soil reduces its ability to absorb new rainfall, causing water to flow into waterways more rapidly. Therefore, the government prioritizes advance preparedness, especially in foothill areas, near waterways, and lowlands, to ensure that residents receive information and warnings promptly if the situation changes," she said. Ms. Lalida added.
Ms. Lalida further explained that Deputy Prime Minister Songsak Thongsri chaired a meeting on 20 August 2026 to review the Nan River basin flood situation, issuing eight directives for relevant agencies to coordinate and prepare continuously. These directives include having the Meteorological Department use radar data to monitor and pinpoint heavy rainfall areas, the Geo-Informatics and Space Technology Development Agency (GISTDA) to use satellite data to track flood boundaries, and the National Water Resources Office, Royal Irrigation Department, and Hydro-Informatic Institute to closely monitor water mass movements.
Simultaneously, the Department of Mineral Resources is tasked with monitoring landslide risk areas. Transportation agencies are instructed to maintain routes and traffic safety, electrical authorities to restore systems prioritizing safety, and communication agencies, Nan province, and the Department of Disaster Prevention and Mitigation (DDPM) are to prepare communication, personnel, machinery, and equipment to provide immediate assistance if necessary.
"While conditions in many areas are improving, the government remains cautious, especially concerning rainfall in upstream areas on 23 August. Residents are advised to continue normal activities but closely follow official updates, particularly those living near foothills, waterways, and lowlands, including Tha Wang Pha, Mueang Nan, Phu Phiang, and Wiang Sa districts, which must monitor water flows from upstream. Relevant agencies have prepared data, alerts, personnel, and equipment to manage the situation," she said. Ms. Lalida concluded.