Geological Survey Warns 15 Provinces of Landslides and Flash Floods
Thailand's Geological Survey warns 15 provinces across the north, central, and east regions of landslide and flash flood risks through August 21, as heavy monsoon rains exceed 200mm daily.
The Geological Survey Department's Disaster Operations Centre issued an alert on August 19, 2026 warning of landslides and flash floods over the coming one to three days. The department has requested volunteers and the public to monitor conditions in 15 provinces: Nan, Phayao, Phrae, Uttaradit, Chiang Rai, Chiang Mai, Lamphun, Lampang, Tak, Mae Hong Son, Phitsanulok, Phetchabun, Kanchanaburi, Chanthaburi, and Trat, with heightened vigilance from August 19-21, 2026.
Northern regions under alert include specific districts in Nan such as Pua, Bo Kluea, Tha Wang Pha, and Mae Chrim, and multiple districts across Phayao, Phrae, Uttaradit, Chiang Rai, Chiang Mai, Lamphun, Lampang, Tak, and Mae Hong Son. Central region areas include Sangkhla Buri and Thong Pha Phum in Kanchanaburi. Eastern areas include Ko Chang and Bo Rai in Trat, and Khao Khitchakut and Khlung in Chanthaburi.
The monsoon trough passing through the northern highlands and Laos, combined with a low-pressure system over northern Vietnam, has triggered continuous heavy rainfall exceeding 200 millimetres in 24 hours, causing flash floods in some areas and increasing landslide risk. Volunteers are asked to maintain continuous rainfall monitoring and alert communities immediately if landslides or flash floods occur, then notify relevant authorities and follow established emergency response protocols.
