How ice patch collapse triggered deadly Uttarkashi flash flood
ISRO scientists discovered that the flash flood that hit Dharali village in Uttarkashi on August 5, 2025, was triggered by a sudden collapse of an exposed ice patch on Srikanta Glacier.
The disaster claimed six lives and caused major damage.
Their findings were published in NPJ Natural Hazards (publication month not specified).
Ice patch appeared in recent imagery prior to the flood
Satellite images showed a large ice patch of about 0.25 sq km (roughly 46-47 American football fields, or about 35 soccer fields) that appeared in recent imagery prior to the August 5, 2025 flood.
It had vanished by August 5, 2025 (the day of the flash flood), leaving deep scars behind.
Researchers call for more satellite monitoring to spot risks early
When the ice patch broke off and slid down 1,700 meters into a stream below, it mixed with meltwater and debris to unleash a powerful flash flood.
Researchers warn that these exposed patches are signs of glaciers melting faster than before and say more satellite monitoring could help spot risks early and keep mountain communities safer.