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The water resources of South Asia, which contribute to the livelihood of over a fifth of the world’s population, are the outcome of complex interactions involving glaciers, mountain snow packs, and monsoons. The complexity is further exacerbated by the rapidly changing waterscape: glaciers are receding and snow packs are thinning from the combination of global warming and increased dust/black carbon emissions, and monsoon patterns are shifting. The continued wellbeing of hundreds of millions of people therefore depends on the careful understanding and management of the evolving South Asian water stores. NASA Earth observations such as GRACE and MODIS provide the continental-scale perspective that is necessary to describe the changing water resources of South Asia. NASA remote sensing assets, aided by detailed hydrologic modeling, therefore have the capacity to bring information down to the local management scale. We propose to collaborate with the Hindu-Kush Himalaya SERVIR hub to train regional stakeholders and local water managers to combine existing remotely sensed data (GRACE and MODIS) with NASA modeling assets (GLDAS and RAPID) in order to provide actionable information on water resources and water - related disasters (floods and droughts) focusing on near real time conditions and on seasonal forecast. The knowledge and technology transfers associated with this proposal are both entirely based on existing open-source tools that we developed, and that can be directly applied even with limited computing capabilities. Our team is composed of experts in hydrologic applications of NASA Earth observations with demonstrated capacity building experience, including previous collaborations with the Hindu-Kush Himalaya SERVIR Hub.