Glacial lakes and dams in Bhutan's Himalaya pose sudden flood risk
Scientists warn that rapidly changing glaciers in the Himalaya have created unstable glacial lakes near Lunana, Bhutan, which could unleash flash floods within minutes.
Rapid warming has altered the glaciers of the world’s highest mountain range, forming several high-altitude lakes in the Lunana valley of Bhutan, close to the Chinese border. Four glacial dams sit in the upper valley, including the Thorthormi dam, which experts label as one of the most hazardous in the Himalaya. A sudden breach could generate a wave that would sweep downstream, threatening thousands of residents in the valley. The speed of a potential flood would leave little time for warning or evacuation.
Why it matters
An abrupt glacial dam breach could cause a fast-moving flood, endangering thousands in Bhutan's remote Himalayan communities.
How this story developed
- Sep 1 Scientists Spot Early Glacier Warning Signs Before Nepal Flood Disaster
- Sep 9 Two hydropower workers were rescued after being trapped for nine days.
- Sep 9 Death toll increased to 1,365 and bodies recovered reached 1,367.
- Sep 14 UN assistant secretary‑general Kanni Wignaraja warned of expanding flood risk across the Himalayas.
- Sep 17 A new UN Environment Programme review labeled glacier melt an “immediate” climate risk.
- Sep 20 The missing‑person count was increased by roughly one thousand.
- Sep 24 A World Weather Attribution study was released indicating that human‑induced warming likely increased the likelihood of the slope collapse.
- Sep 25 Prime Minister Balendra Shah addressed the United Nations, requesting grant‑based assistance and proposing a Himalayan climate‑resilience mechanism.
- Sep 26 Australian families have newly demanded disclosure of mobile‑phone activity logged on August 27.
- Sep 27 An avalanche on the 7,126-metre Himlung Himal in Manang’s Nar Phu area left ten climbers and support workers unaccounted for.
- Sep 27 The UN loss‑and‑damage fund has still not announced any allocation for Nepal’s flood response.
- Sep 28 A rescue team arrived at Himlung base camp on Monday to begin searches.
- Sep 30 Switzerland’s glaciers shed more than 5% of their ice in 2026, continuing a decade-long trend of rapid melt linked to global warming.
- Oct 2 Aletsch Glacier recorded its largest melt on record and Glacier de Tsanfleuron thinned by more than four metres.
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