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What happened, where and when?
According to successive UN situation reports that are referring to in initial government assessment reports, between 21 and 30 July 2025, heavy rainfall associated with the remnants of Tropical Depression Wipha caused widespread flooding and landslides across northern and central provinces of Lao PDR. A disaster update has been released following Tropical Depression Wipha, which brought heavy rainfall and triggered ooding, ash oods, and landslides across several provinces in Lao PDR between 21-25 July 2025. Provinces affected by Tropical Depression Wipha include Vientiane, Bolikhamxay, Luang Prabang, Xayabouly, Xiengkhouang, Houaphan, Xaysomboun, Khammouane, Bokeo.
According to the UN Lao PDR Monsoon Situation Report (Sitrep) No. 5 published on 31 July 2025, between 27 and 28 July, In Hinboun District, Khammouane Province, oods submerged homes—some up to the ceilings of single-storey buildings—and affected 13 villages.
The flooding damaged rice fields (41.32 hectares), crops (4.30 hectares), livestock (2 pigs), and 41 fishponds, impacting more than 335 families. Road access between Thongmixay and Paklay districts was temporarily cut o due to erosion and fallen trees but has since been restored by local authorities. Total damages in the district are estimated at over 1.2 billion Lao kip (equivalent CHF44,581)
As of 29 July, water levels in the Mekong River had risen significantly. At Sisattanak (Km4 Station) in Vientiane Capital, as well as in Nong Khai and Pakse, water levels reached warning thresholds. The Mekong River Commission has forecasted that ood levels in Vientiane Capital and Pakse may be exceeded between 30 July and 3 August, urging people living in low-lying areas to remain alert for flash floods and landslides.
On 31 July, the Department of Meteorology and Hydrology issued a water level warning for Mekong tributaries due to the combined effect of a low-pressure system and the southwest monsoon. Provinces including Khammouane, Savannakhet, and Champasak are experiencing rising water levels. In some locations—such as the Xe Bang Hieng and Xe Champhone rivers—levels have already exceeded flood thresholds. Authorities have advised people in riverside and low-lying areas to remain on high alert for potential flash floods over the next fews days.