We are working on generating information on surface water extent for South Asia to support the monitoring and forecasting of flood inundation in the region. This has been made possible through our collaboration with the NASA SERVIR Applied Sciences Team (AST) member – Franz J Meyer, at the University of Alaska Fairbanks. HydroSAR uses weather-independent data from spaceborne radar remote sensing sensors to map surface water extent every time the satellite collects imagery over an area of interest. Using a fully cloud-based implementation, HydroSAR is able to create flood-relevant data products quickly even across large spatial scales, delivering information within hours of satellite data acquisition. To facilitate access to global radar remote sensing archives, the HydroSAR team is working to implement the SAR data processing workflows in the Alaska Satellite Facility (ASF)’s cloud environment. ASF, NASA’s main data centre for radar remote sensing data, currently provides access to more than 13 petabytes of Synthetic Aperture Radar (SAR) data acquired by air- and space borne radar sensors over a time span of more than 40 years. ASF hosts a copy of the global Sentinel-1 archive, a currently-flying sensor constellation operated by the European Space Agency since 2014. ASF will also be the main data centre for the upcoming NASA-ISRO L-band SAR mission NISAR, which will be launched in 2023 and will provide global coverage with free-and-open SAR data every 12 days. ASF operates most of its archive in the cloud and has developed a number of higher-level products as well as cloud-based services to make its data holdings more accessible to an ever-growing community of science and applications users. At ICIMOD, we are developing a web application to disseminate the inundation extent to users and stakeholders in the region. The app is currently under development and can be accessed here. EXPLORE APPLICATION