NOAA’s flood mapping tool now covers nearly 100% of U.S.

NOAA’s flood mapping tool now covers nearly 100% of U.S. Experimental Flood Inundation Mapping provides valuable guidance for decision-makers and public September 24, 2026 NOAA's flood inundation map (left) depicting the forecast for flooding extent in New London, Wisconsin, and a photo of flooded streets in New London (right), dated April 17, 2026. (Image credit: NOAA NWS) Download Image NOAA’s National Weather Service announced today that Flood Inundation Mapping (FIM), a revolutionary tool for predicting river flooding, is now available on an experimental basis to nearly 100% of the U.S. population. This is a massive expansion from FIM’s prior coverage of 60% of the country. FIM produces estimates of land area covered in water based on model forecast river flows and current conditions that predict where flooding impacts may occur in the following days. It’s a tool for forecasters, emergency managers and the public that alerts users to the latest river and stream flooding conditions. “Inundation maps are a critical tool for assessing the impacts of flooding,” said NOAA Administrator Neil Jacobs, Ph.D. “NOAA prioritized expanding FIM to ensure that nearly every American can access

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