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USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.

Web Portal Changes: In Spring 2024, the Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS) at a repurposed https://water.noaa.gov. A preview of NWPS is available here, where you can see your station hydrograph by replacing SSSSS with the station 5-character id: https://preview.water.noaa.gov/gauges/SSSSS.

Flood Inundation Mapping: Experimental real-time flood Inundation mapping services for 10% of the United States are now available via the NWS Map Viewer. Additional products and geospatial services depicting River Forecast Center and National Water Model forecasts continue to be accessible as described in the StoryMap here.

Please visit https://www.weather.gov/owp/operations for more information.



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AHPS Downloads

While the AHPS display allows for the use of interactive toggles with the image, AHPS data can also be utilized within GIS software. This page links to "Shapefiles" and "KMZ" files (generated every 15 minutes) which are compressed "KML" files compatible with several GIS software applications. A list of some of the software applications that support Shapefiles and KML can be found HERE or, visit the NWS website Standards Description Website which explains KML in more detail.

Recently, the downloadable observations and forecast files have changed. Click here to see a summary of the changes.

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