CTP Information Exchange // NWS Flood Inundation Mapping Services

Originally presented on 11.20.25 The National Weather Service (NWS) is in the midst of a national rollout of new transformational forecast flood inundation mapping (FIM) services to the nation. These new services complement the issuance of flood watches and warnings by providing near-real-time, high-resolution, neighborhood-level visualizations of inundation extent. This inundation modeling capability provides actionable information for emergency and water resource managers to prepare, mitigate and respond to flood impacts throughout the life cycle of an event. These services improve the ability to provide impact-based decision support services so that communities can preposition people and resources ahead of flood events.