# Flooding and landslides in northern Thailand

> Live situation record from CLSTR: https://clstr.news/situations/flooding-and-landslides-in-northern-thailand
> Updated: 2026-08-21T01:46:03.000Z. Sources: 24. Developments: 2.

Severe flash floods and heavy rainfall have caused widespread destruction in northern Thailand, particularly in Nan province. The disaster has resulted in at least two deaths and five injuries, with more than 30,000 people affected. In Nan, approximately 13,000 homes have sustained damage across the Pua, Tha Wang Pha, Phu Phiang, and Santisuk districts.

Heavy rains in forested mountainous areas, with some regions recording up to 300mm of rainfall within four hours, triggered rapid runoff and mudslides into lower-lying communities. This has caused significant infrastructure damage, including the collapse of roads and the destruction of highway networks. The Department of Highways has deployed emergency crews and heavy machinery to clear landslides and repair washed-out sections of Highway 1256 and Highway 1371.

In response, Prime Minister and Minister of Interior Anutin Charnvirakul has initiated a rapid action plan involving early evacuations and the establishment of temporary shelters. Approximately 2,000 residents in the hardest-hit villages across Nan and Mae Hong Son provinces have been moved to higher ground. Deputy Prime Minister Yodchanan Wongsawat has visited affected areas to monitor relief efforts and has issued warnings regarding potential landslides in the Chaloem Phra Kiat, Thung Chang, and Bo Kluea districts.

Recovery efforts continue with roughly 700 military personnel mobilized to assist with mud removal and cleaning in residential areas. While water levels began to recede in some areas, heavy rains have shifted toward southern and northeastern provinces, including Phitsanulok, Sukhothai, and Ubon Ratchathani. Rescue workers and volunteers continue to use boats to distribute food and water to flooded settlements.

## Claims

- Deputy Prime Minister Yotsachanan Wongswasdi is traveling to Nan to monitor the situation and direct relief efforts. (disputed by 4 sources)
- One fatality, a bedridden patient, has been reported due to the flash floods. (disputed by 2 sources)
- At least two people have died and more than 30,000 people have been affected by flooding in Nan province. (disputed by 2 sources)
- Nan province has declared disaster areas following heavy rain and flash floods. (corroborated by 5 sources)
- Prime Minister and Minister of Interior Anutin Charnvirakul has ordered all sectors to provide full assistance to flood victims. (corroborated by 3 sources)
- Approximately 13,000 homes have been damaged in the Pua, Tha Wang Pha, Phu Phiang, and Santisuk districts. (corroborated by 2 sources)
- Prime Minister and Minister of Interior Anutin Charnvirakul announced a rapid action plan involving early evacuations and the establishment of temporary shelters. (corroborated by 2 sources)
- In Pua district, 9 sub-districts and 35 villages are affected, impacting approximately 8,000 households and 16,000 people. (single source)
- Five roads have been cut off due to the flooding. (single source)
- The Ministry of Public Health has raised its preparedness level to the highest to handle potential flooding in Nan city. (single source)
- DDPM Region 10 Lampang has deployed rescue personnel, jet skis, and machinery to assist in Pua, Nan. (single source)
- The Department of Highways has dispatched emergency crews and heavy machinery to Nan province to repair roads damaged by floods. (single source)

## Timeline

### 2026-08-21: Tolikara shooting injures police officer in Papua

A police officer was critically wounded in a shooting by the KKB in Tolikara, Papua. Meanwhile, the BNPT clarified that KKB actions in the region do not meet the legal definition of terrorism.

8 sources. https://clstr.news/cluster/thailand-floods-cause-two-deaths-and-thousands-of-evacuations

### 2026-08-19: Nan province hit by deadly flash floods and landslides

Flash floods in Nan, Thailand, have killed at least two people and affected over 30,000 residents. Heavy rainfall caused widespread home damage and destroyed critical road infrastructure.

16 sources. https://clstr.news/cluster/nan-province-faces-severe-flooding-and-flash-floods

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Cite as: Flooding and landslides in northern Thailand. CLSTR, https://clstr.news/situations/flooding-and-landslides-in-northern-thailand