Dated brief, 30 August 2026 (figures were still moving). This is not a UV-index forecast for the valley. It is a record of a disaster that sat at elevation, with sources you can open, plus one planning note if you are on high ground when the rain breaks.

On the morning of 26 August, ice, rock, and mud ran from near Langtang Lirung down the Lhende into the Bhotekoshi and Trishuli. Nepal’s NDRRMA and Chinese local authorities were still counting on Sunday: on the order of 800 dead and more than 3,000 missing across both sides of the border. Hydropower tunnels still held workers. A debris dam, then a second landslide, kept interrupting the search.

The U.S. Geological Survey told reporters the first “quake” was the collapse itself, not a tectonic trigger. University of Calgary researchers reading Planet Labs imagery for Reuters put the break near 5,200 m, with debris falling about 1,200 m to the valley floor. ICIMOD tracked the surge down the Bhote Koshi / Trishuli. Downstream at Galchhi, water was reported up by as much as nine metres in 30 minutes.

We are not a wire service. For the live casualty and rescue picture, use NDRRMA, Reuters’ reconstruction, the Kathmandu Post, and Chinese official statements from Gyirong—not this page.

If you are on a ridge when the cloud breaks

Thick monsoon rain that hides the solar disc cuts UV. A break that throws a sharp shadow does not. Search lines and high-ground waits sit well above the valley floor. Cool, wet air is not a low-UV signal.

UV still climbs as the atmosphere thins—see higher elevation, stronger UV. We are not publishing a local index for Rasuwa today. If you are actually in the sun on a Himalayan ridge, cover skin the way you would on any bright altitude day, then get back to the flood warning. The emergency is the water.

Sources

Public reporting as of Sunday 30 August 2026: Nepal NDRRMA, Reuters (USGS, Planet Labs, University of Calgary, ICIMOD), the Guardian, AFP / France 24, Al Jazeera, the Kathmandu Post, Xinhua / CCTV, U.S. State Department. Tibet-side counts came only from Chinese authorities; foreign journalists were not in. Death and missing totals were still rising.