For more than two decades, the National Weather Service (NWS) has delivered river observations and forecast products and services via the Advanced Hydrologic Prediction Service (AHPS). The NWS has replaced AHPS with a new, enhanced website, the National Water Prediction Service (NWPS). Existing AHPS content and features will be preserved and expanded within NWPS.

You can provide feedback on the upgraded site here.

Legacy AHPS - Advanced Hydrologic Prediction Service	NWPS - National Water Prediction Service

NWPS Page features:

• Dynamically-plotting hydrographs (example: Sac River @ I Street Bridge)
• Improved web map functionality and improved base maps and hydro-specific spatial layers
• Application Programming Interface (API) - partners can leverage directly into their own applications
• Summary of these features is on this Story Map

• Operational NWPS Page: https://water.noaa.gov/ | Sacramento-centric: https://water.noaa.gov/wfo/sto 
• Current AHPS Page (through May 27): https://water.weather.gov/ahps2/index.php?wfo=sto
• California-Nevada River Forecast Center Page (no URL changes): https://www.cnrfc.noaa.gov/

• Informational One-Pager on NWPS
• Detailed NWPS Product and User Guide
• NWPS Testing API
• National Public Information Statement

Note: The California-Nevada River Forecast Center's (CNRFC) page will continue to be available with the same look and feel.

If you have any questions or comments on this new website service, please contact:

Scott Rowe - scott.rowe@noaa.gov
Senior Service Hydrologist
National Weather Service - Sacramento, California
 

(last updated 3/27/2024)