 This research aims to design a hybrid cloud computing, HCC, platform that can utilize and integrate the computing resources across different organizations to build a unified geospatial cloud computing platform, enabling geoscientists to test and leverage the cloud capabilities through a web interface and providing different geospatial cloud services such as workflow as a service on top of common cloud services provided by general cloud platforms. A HCC prototype is developed and dust storm simulation is used to demonstrate the capability and feasibility of such platform in facilitating geosciences by leveraging a cross-organization computing and model resources. This article was authored by Kuning Huang, Jing Li, and Shen Long Li.