The NSSL Warning Decision Support System – Integrated Information (WDSS-II) continues to provide an invaluable development environment to facilitate the development of innovative multiple-sensor severe weather applications. During 2003, NSSL created new, and improved multiple-sensor algorithms. These new applications include improved multiple-sensor data quality control applications, a two-dimensional reflectivity motion estimation algorithm, and applications designed to blend data from WSR-88D and TDWR radars. These new concepts have been tested in an operational setting at the NWS Forecast Offices at Jackson, Mississippi, and Wichita, Kansas, where multiple level-II WSR-88D and mesoscale model data streams were available for operations. We have evaluated the operational utility of the new severe weather algorithms (and the new display concepts) in a proof-of-concept test setting. These new concepts will continue to be tested to determine whether they will be included in future operational National Weather Service systems that help guide and manage the severe weather warning decision making process.