A number of regional and national real-time flood forecasting systems are emerging for a variety of different flood-related applications. These new systems are taking advantage of new national hydrologic data standards, new advances in supercomputing availability and improvements in model parameterizations and meteorological forcing datasets. This session encourages contributions from all sectors of the AMS enterprise (academic, government and the private sector) who have built and deployed such systems. Additionally, contributions are welcome from researchers who have developed novel methodologies to sense and model flood generation dynamics at a variety of time and space scales. We are also seeking abstracts that focus on hydrological modeling systems which require, and utilize high performance computing (HPC) resources to improve the overall understanding and real-time prediction of hydrologic processes at all scales (land surface, aquifer, and stream/river flows) and their extremes (especially those with high impacts on society). Also in this session, interdisciplinary researchers, from meteorologists to engineers, are encouraged to demonstrate different methodologies and tools for better understanding the spatiotemporal characteristics of tropical cyclones (TCs) and improving risk-based analysis and real-time forecasts of the rainfall and/or storm surge associated with TCs. In addition, studies involving flood mitigation from the local to the regional scale are invited given the increasing need for protection from such events. Research and application contributions from within the United States as well as internationally are also encouraged.