A massive collapse of ice and rock along the Nepal-China border triggered a catastrophic flash flood through river valleys on Friday, killing more than 600 people and causing an estimated $6 billion to $10 billion in damage and economic losses.
Officials in Nepal and neighboring Tibet reported that over 1,500 people remain missing across the region as search-and-rescue teams struggle through ruined roads and downed communication lines.
The disaster began when a major glacier collapsed in Nepal’s Rasuwa District and Gyirong County in China. The impact registered as a 5.2-magnitude seismic signal. The falling mass of ice, mud, and boulders plunged into river channels, unleashing a wave of debris that tore down the Bhotekoshi and Trishuli river corridors.
Preliminary figures from private forecaster AccuWeather place the total direct and indirect economic hit between 915 billion and 1.5 trillion Nepalese rupees ($6 billion to $10 billion). That estimate covers destroyed bridges and homes, wiped-out power plants, emergency rescue costs, lost agricultural output, and long-term public health impacts.
“The devastation in Nepal is heartbreaking. Families and entire communities are dealing with a tremendous loss of life and destruction, while damage to critical infrastructure is making an already difficult situation even more challenging,” said AccuWeather Chief Meteorologist Jonathan Porter. “The full scope of this disaster will take time to understand, and recovery in some of the hardest-hit communities could be a long and difficult process that takes years.”
The wall of water severed vital transport links in the landlocked country. Floodwaters wrecked at least 41 bridges and buried roughly 13 kilometers (8 miles) of the Prithvi Highway under heavy mud, while shutting down another 10-kilometer stretch. The highway serves as a primary trade artery connecting the capital to western Nepal and external border points.
“Cleaning up from a disaster of this magnitude will be an enormous undertaking. Massive amounts of mud, rock and debris will have to be removed before some roads, bridges and communities can fully reopen, and that process could take months or longer in the hardest-hit areas,” Porter said. “Nepal is located between India and China making these transportation corridors especially important. The loss of critical roads and bridges can disrupt the movement of people, emergency supplies and commerce, adding to the economic impact and making the recovery even more challenging.”
Nepal deployed army units, disaster response personnel, medical staff, and helicopters to reach villages cut off by the surge.
Meteorologists noted that while single events require detailed study, regional conditions have grown increasingly unstable. Research indicates the Himalayas have warmed at a rate well above the global average, causing regional glaciers to retreat, leave behind fragile lakes, and destabilize steep mountainsides.
“Studies have shown that glacier-melt has rapidly increased, and all 23 high mountain glaciers in the region lost mass in 2025, according to a recent report,” said AccuWeather meteorologist Brett Anderson. “It is too early to say definitively that climate change directly triggered this collapse, but warming temperatures are certainly transforming the Himalayan landscape.”
Anderson cautioned that the broader hazard remains ongoing for valley settlements.
“Retreating glaciers can also leave large depressions that can form into glacier lakes,” Anderson said. “As the region continues to steadily warm over the coming decades the threat for sudden landslides of ice and rock will continue to increase, putting more villages in the region at risk.”
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