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National Water Center Products and Services

Weather.gov > Office of Water Prediction > National Water Center Products and Services

Click here for the 2026 National Hydrologic Assessment

NEW - National Water
Prediction Service (NWPS) - NEW

On March 27, 2024, the National Water Prediction Service (NWPS) website hosted at https://water.noaa.gov was launched replacing the legacy Advanced Hydrologic Prediction Service (AHPS) page previously located at https://water.weather.gov. Resources and more information are listed below.

Public Notification Statement: November 16, 2023
Service Change Notice (SCN):January 12, 2024
SCN: March 6, 2024

NWPS Quick Start Guide
Accessing Hydrographs on a Mobile Device through NWPS
NWPS Flyer
NWPS API Flyer
NWPS Fact Sheet
NWPS Overview (Story Map)
NWPS Product and User Guide
Recording of NWPS Partner Webinar
Recording of NWPS API Webinar
Service Description Document (SDD)
Using the National Water Model within NWPS (StoryMap)

Contact: nwps.webmaster@noaa.gov

NEW - Flood Inundation
Mapping (FIM) Services - NEW

Experimental FIM services are now available for 60% of the U.S. population including Hawaii and portions of South Central Alaska. These services will be expanded to nearly 100% of the U.S. population in 2026. Experimental services depict the extent of predicted inundation, as derived from River Forecast Center forecasts and National Water Model analyses and forecasts. Services are available via the National Water Prediction Service, the NWS GIS Viewer, or directly via URLS hosted on the Hydrologic Visualization and Information Services (HydroVIS) cloud system. Additional informational resources are available below.

Public Notification Statement (PNS)
FIM Fact Sheet
Spanish Translation Dynamic FIM Services
Stage-based CatFIM Service Summary
Frequently Asked Questions (FAQs)
FIM Service Description Document (SDD)
Viewer Access Instructions
API Access Instructions
Viewing FIM in NWPS
Using CatFIM in NWPS
HydroVIS Technical Updates
FIM Technical Updates

CLICK HERE to Provide Feedback

NEWKey MessagesNEW

Key Messages graphics highlight the most essential information for upcoming flood potential by drawing attention to the most impactful hazards, aligning and amplifying the high-level flood message across the entire NWS field structure.

Flood Hazard Outlook

High Level graphical depiction and key messages highlighting the potential threat of inland flood hazards (flash, urban, small stream and riverine) and their associated impacts (catastrophic, considerable, and limited) for the next seven days.

FHO Product Description Document
Provide Feedback on FHO
FHO One-Pager

Area Hydrologic Discussion

Experimental short range, episodic, discussion and graphic which highlights locations across the nation that may be impacted by rapid-onset flooding, using National Water Model and other guidance.

AHD Product Description Document
Provide Feedback on AHD
AHD One-Pager

National Hydrologic Discussion

Experimental discussion of the current and forecast hydrologic conditions across the nation, including a variety of short and medium range (Days 1-10) observed and modeled hydrologic guidance.

NHD Product Description Document
Provide Feedback on NHD
NHD One-Pager

NEW River Ice SurveillanceNEW

The NWC experimental Synthetic Aperture Radar River Ice Surveillance (SARRIS) product provides periodic intelligence on the extent of river ice and open water across CONUS and Alaska during cold seasons based on Synthetic Aperture Radar remote sensing analyses.

SARRIS Product Description Document
Provide Feedback on SARRIS

Significant River Flood Outlook

Operational flood outlook intended to provide a general outlook for significant (moderate and above) river flooding. It is not intended to depict all areas of minor flooding or small-scale events such as localized flooding and/or flash flooding.

NWC Visualization Services

Experimental geospatial services depicting forecasts from the River Forecast Centers and the National Water Model. Services available via the prototype NWS National Map Viewer, or directly via URLs hosted on the Hydrologic Visualization and Inundation Services (HydroVIS) cloud resource.

Public Services Handbook
NWC Visualization Services Service Description Document
Provide Feedback on NWC Visualization Services

Office of Water Prediction

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US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
Office of Water Prediction
1325 East West Highway
Silver Spring, MD 20910

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