This two-part, mixed-methods research project seeks to discover how emergency managers’ (EMs) differing individual and job characteristics influence how effectively they use the National Weather Service’s (NWS) forecasts and Impact-Based Decision Support (IDSS). Primary project outputs include identifying particular EM characteristics that should be considered to help construct more effective IDSS, and a method whereby NWS Weather Forecast Offices can improve their IDSS in concert with their core partners.