"Mekong River in Bueng Kan" is the subject of this report. The Mekong River in Bueng Kan remains stable, with large amounts of wood debris floating downstream, while the Department of Disaster Prevention and Mitigation has issued warnings of heavy to very heavy rain that could cause flash floods and forest runoff.
At 06:00 on 4 September 2026, reporters observed that the Mekong River level in Bueng Kan Province at the Ban Phan Lam measurement point, Village No. 2, Wisit Subdistrict, Mueang Bueng Kan District, was recorded at 10.68 meters, 3.72 meters below the riverbank (which is at 14.00 meters), considered normal (green flag), and 40 centimeters higher than on 2 September.
The rising Mekong water level has begun to back up tributaries connected to the river again. This increase not only affects the main tributaries on both the Thai and Lao sides but also brings large amounts of wood debris and aquatic plants floating on the river, obstructing ferry services between Bueng Kan city and Pakxan city in Bolikhamxay Province, Laos. Operators must exercise caution due to the risk of water accidents. Additionally, this situation affects local fishermen who cannot lay nets or fishing lines effectively.
Meanwhile, the Bueng Kan Provincial Office of Disaster Prevention and Mitigation has issued a warning of heavy to very heavy rain that may cause flash floods, forest runoff, landslides, and waterlogging from 4 to 7 September 2026. Particularly in high-risk areas prone to flooding and landslides, including natural tourist sites such as waterfalls and Tham Lod cave, authorities are advised to prepare temporary shelters to accommodate evacuees adequately.
In case of flooding emergencies, responsible agencies, including local administrative organizations, village heads, and community leaders, are requested to prepare sufficient food, drinking water, and essential supplies at temporary shelters. They should also ensure disaster relief equipment, machinery, vehicles, and personnel are ready to assist flood victims around the clock. Relevant agencies are instructed to follow disaster prevention and mitigation plans, alert the public through all channels, and closely monitor official water level and situation updates.
From 4 to 7 September 2026, upper Thailand will experience heavy rain in some areas, with northern and northeastern regions facing heavy to very heavy rain, and some southern areas also receiving heavy rain. This is due to the monsoon trough shifting across the north and upper northeast into a low-pressure area over the northern Gulf of Tonkin. Meanwhile, the southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand remains moderate. Wave conditions in the Andaman Sea and Gulf of Thailand are moderate, with wave heights around 2 meters, increasing to over 2 meters in areas with thunderstorms.
From 8 to 10 September 2026, upper Thailand will see increased rainfall coverage with heavy rain in many areas, including lower northern, northeastern, central, eastern regions, and the western southern coast. This is due to the monsoon trough shifting across central and lower northeastern Thailand into a low-pressure area over the upper South China Sea.
Meanwhile, the southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand will strengthen. Waves in the upper Andaman Sea will become quite strong, with wave heights between 2 to 3 meters and over 3 meters in areas with thunderstorms. The upper Gulf of Thailand and lower Andaman Sea will have wave heights around 2 meters, rising above 2 meters in areas experiencing thunderstorms.
Authorities warn residents in upper Thailand to be cautious of heavy to very heavy rain and accumulated rainfall that may cause flash floods, forest runoff, and riverbank overflows, especially in low-lying and waterway-adjacent areas. Boaters should navigate with care and avoid sailing during thunderstorms. Small boats in the upper Andaman Sea are advised to remain ashore from 8 to 9 September 2026.