Why Nepal floods resulted in a disaster even after satellites spotted danger

CORRESPONDENCE 15 September 2026 By Rajeev Bhattarai0 Rajeev Bhattarai Mississippi State University, Starkville, Mississippi, USA. The flash flood that struck Nepal’s Bhotekoshi valley on 26 August, triggered by a glacial collapse, has killed more than 1,000 people and has left many more missing. Satellite imagery captured the collapse and is now informing recovery operations on the ground, proving that the observational capacity already exists. The more consequential question is whether comparable signals were detectable beforehand and, if so, did they reach anyone positioned to act on them? Nature 657, 848 (2026) doi: https://doi.org/10.1038/d41586-026-02907-5 Competing Interests The author declares no competing interests. Related Articles Early warning could have saved hundreds of lives in Nepal floods Satellite images before Nepal disaster showed warning signs Disaster early-warning systems can succeed — but collective action is needed Subjects Latest on: Climate change Environmental sciences Policy Make AI traceable before it shapes global climate assessments Correspondence 15 SEP 26 Underground hydrogen could spur a green-energy revolution — if companies can find it News Feature 15 SEP 26 How is climate change affecting conifers and their ability to sequester carbon? News & Views 14 SEP 26 Cities and countryside are intimately linked — green initiatives must recognize that Comment 15 SEP 26 Rivers deliver unexpectedly high loads of microplastics to the sea Research Highlight 10 SEP 26 Nepal disaster is a wake-up call to take compound climate risks seriously Correspondence 08 SEP 26 A wake-up call: diversify global research funding Correspondence 15 SEP 26 Make AI traceable before it shapes global climate assessments Correspondence 15 SEP 26 Global inequality panel is a chance for research to change lives Editorial 15 SEP 26