Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: The National Hydrologic Discussion, Area Hydrologic Discussion, and Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via https://www.weather.gov/owp/operations, as described in the StoryMap here.

Warnings & Forecasts

Graphical Forecasts

National Maps

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River Forecasts

Long-Range River Flood Risk

Precipitation

River Download

Other Information

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.

Observed

• Shapefile

  • Shapefile (Observed)
    • Description: The most recent observation values from 06/02/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 1,219 KB

• KMZ

  • KMZ (Observed)
    • Description: The most recent observation values from 06/02/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 962 KB

Forecast

• Shapefile

  • Shapefile (Maximum Forecast 1-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/03/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 625 KB
  • Shapefile (Maximum Forecast 2-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/04/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 623 KB
  • Shapefile (Maximum Forecast 3-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/05/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 619 KB
  • Shapefile (Maximum Forecast 4-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/06/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 614 KB
  • Shapefile (Maximum Forecast 5-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/07/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 604 KB
  • Shapefile (Maximum Forecast 6-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/08/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 603 KB
  • Shapefile (Maximum Forecast 7-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/09/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 596 KB
  • Shapefile (Maximum Forecast 8-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/10/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 596 KB
  • Shapefile (Maximum Forecast 9-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/11/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 587 KB
  • Shapefile (Maximum Forecast 10-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/12/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 584 KB
  • Shapefile (Maximum Forecast 11-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/13/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 584 KB
  • Shapefile (Maximum Forecast 12-Day)
    • Description: The maximum forecast values from 06/02/2023 14:54 UTC to 06/14/2023 14:54 UTC.
    • Last Updated: 06/02/2023 14:54 UTC
    • Size: 584 KB
  • Shapefile (Maximum Forecast 13-Day)
    • Description: The maximum forecast values from 06/02/2023 14:54 UTC to 06/15/2023 14:54 UTC.
    • Last Updated: 06/02/2023 14:54 UTC
    • Size: 584 KB
  • Shapefile (Maximum Forecast 14-Day)
    • Description: The maximum forecast values from 06/02/2023 14:54 UTC to 06/16/2023 14:54 UTC.
    • Last Updated: 06/02/2023 14:54 UTC
    • Size: 584 KB
  • Shapefile (Maximum Forecast Entire Period)
    • Description: The maximum forecast values from 06/02/2023 14:54 UTC to 06/16/2023 14:54 UTC.
    • Last Updated: 06/02/2023 14:54 UTC
    • Size: 628 KB

• KMZ

  • KMZ (Maximum Forecast 1-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/03/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 362 KB
  • KMZ (Maximum Forecast 2-Day)
    • Description: The maximum forecast values from 06/02/2023 14:53 UTC to 06/04/2023 14:53 UTC.
    • Last Updated: 06/02/2023 14:53 UTC
    • Size: 360 KB
  • KMZ (Maximum Forecast 3-Day)
    • Description: The maximum forecast values from 06/02/2023 14:54 UTC to 06/05/2023 14:54 UTC.
    • Last Updated: 06/02/2023 14:54 UTC
    • Size: 360 KB
  • KMZ (Maximum Forecast 4-Day)
    • Description: The maximum forecast values from 06/02/2023 14:54 UTC to 06/06/2023 14:54 UTC.
    • Last Updated: 06/02/2023 14:54 UTC
    • Size: 360 KB
  • KMZ (Maximum Forecast 5-Day)
    • Description: The maximum forecast values from 06/02/2023 14:54 UTC to 06/07/2023 14:54 UTC.
    • Last Updated: 06/02/2023 14:54 UTC
    • Size: 355 KB
  • KMZ (Maximum Forecast 6-Day)
    • Description: The maximum forecast values from 06/02/2023 14:54 UTC to 06/08/2023 14:54 UTC.
    • Last Updated: 06/02/2023 14:54 UTC
    • Size: 355 KB
  • KMZ (Maximum Forecast 7-Day)
    • Description: The maximum forecast values from 06/02/2023 14:54 UTC to 06/09/2023 14:54 UTC.
    • Last Updated: 06/02/2023 14:54 UTC
    • Size: 355 KB
  • KMZ (Maximum Forecast 8-Day)
    • Description: The maximum forecast values from 06/02/2023 14:55 UTC to 06/10/2023 14:55 UTC.
    • Last Updated: 06/02/2023 14:55 UTC
    • Size: 355 KB
  • KMZ (Maximum Forecast 9-Day)
    • Description: The maximum forecast values from 06/02/2023 14:55 UTC to 06/11/2023 14:55 UTC.
    • Last Updated: 06/02/2023 14:55 UTC
    • Size: 358 KB
  • KMZ (Maximum Forecast 10-Day)
    • Description: The maximum forecast values from 06/02/2023 14:55 UTC to 06/12/2023 14:55 UTC.
    • Last Updated: 06/02/2023 14:55 UTC
    • Size: 358 KB
  • KMZ (Maximum Forecast 11-Day)
    • Description: The maximum forecast values from 06/02/2023 14:55 UTC to 06/13/2023 14:55 UTC.
    • Last Updated: 06/02/2023 14:55 UTC
    • Size: 358 KB
  • KMZ (Maximum Forecast 12-Day)
    • Description: The maximum forecast values from 06/02/2023 14:55 UTC to 06/14/2023 14:55 UTC.
    • Last Updated: 06/02/2023 14:55 UTC
    • Size: 358 KB
  • KMZ (Maximum Forecast 13-Day)
    • Description: The maximum forecast values from 06/02/2023 14:55 UTC to 06/15/2023 14:55 UTC.
    • Last Updated: 06/02/2023 14:55 UTC
    • Size: 358 KB
  • KMZ (Maximum Forecast 14-Day)
    • Description: The maximum forecast values from 06/02/2023 14:56 UTC to 06/16/2023 14:56 UTC.
    • Last Updated: 06/02/2023 14:56 UTC
    • Size: 358 KB
  • KMZ (Maximum Forecast Entire Period)
    • Description: The maximum forecast values from 06/02/2023 14:56 UTC to 06/16/2023 14:56 UTC.
    • Last Updated: 06/02/2023 14:56 UTC
    • Size: 366 KB

Long Range

• Shapefile

  • Shapefile (Long Range Flood Risk - 3 month, 5%)
    • Description: Flood levels based on a 5% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 150 KB
  • Shapefile (Long Range Flood Risk - 3 month, 10%)
    • Description: Flood levels based on a 10% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 150 KB
  • Shapefile (Long Range Flood Risk - 3 month, 25%)
    • Description: Flood levels based on a 25% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 150 KB
  • Shapefile (Long Range Flood Risk - 3 month, 50%)
    • Description: Flood levels based on a 50% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 150 KB
  • Shapefile (Long Range Flood Risk - 3 month, 75%)
    • Description: Flood levels based on a 75% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 150 KB
  • Shapefile (Long Range Flood Risk - 3 month, 90%)
    • Description: Flood levels based on a 90% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 150 KB
  • Shapefile (Long Range Flood Risk - 3 month, 95%)
    • Description: Flood levels based on a 95% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 150 KB

• KMZ

  • KMZ (Long Range Flood Risk - 3 month, 5%)
    • Description: Flood levels based on a 5% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 198 KB
  • KMZ (Long Range Flood Risk - 3 month, 10%)
    • Description: Flood levels based on a 10% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 200 KB
  • KMZ (Long Range Flood Risk - 3 month, 25%)
    • Description: Flood levels based on a 25% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 201 KB
  • KMZ (Long Range Flood Risk - 3 month, 50%)
    • Description: Flood levels based on a 50% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 201 KB
  • KMZ (Long Range Flood Risk - 3 month, 75%)
    • Description: Flood levels based on a 75% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 201 KB
  • KMZ (Long Range Flood Risk - 3 month, 90%)
    • Description: Flood levels based on a 90% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 201 KB
  • KMZ (Long Range Flood Risk - 3 month, 95%)
    • Description: Flood levels based on a 95% threshold for the 3-month period Jun-Jul-Aug
    • Last Updated: 06/02/2023 15:00 UTC
    • Size: 201 KB

• CSV

  • Long Range River Flood Risk Data
    • Description: A complete list of all lids that receive LRO data showing the most recent data received by each.
    • Size: 439k
    • Last Updated: 06/02/2023 15:00 UTC (Updated every 1 hour)

RSS

• AHPS RSS

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