The $1.3 billion NASA-ISRO Synthetic Aperture Radar (NISAR) satellite detected accelerating mountain movements weeks before Nepal’s catastrophic Rasuwa flash flood on 26 August 2026, yet no early warning was issued to downriver communities. The 99 million cubic metre rock-and-ice collapse from Langtang Lirung plunged 2,170 vertical metres, killing 1,451 people and leaving 5,745 missing.
Institutional coordination gaps between space agencies and disaster response authorities left critical earth-observation data unmonitored across processing pipelines like ISRO’s Bhoonidhi portal. L-band radar data recorded cumulative horizontal displacements exceeding five metres between 20 June and 19 August 2026. Data sat unanalyzed in real time. Unmonitored satellite telemetry highlights a severe command deficit, where sensor deployment outpaces joint operational analysis and actionable dissemination infrastructure. Sustained heatwaves reaching 8 to 9 degrees Celsius destabilised high-altitude permafrost, aggravating regional hazard risks across 25,000 Himalayan glaciers without real-time operational decision authority or oversight.