National Water Center Products and Services HOME FORECAST Local Graphical Aviation Marine Rivers and Lakes Hurricanes Severe Weather Fire Weather Sunrise/Sunset Long Range Forecasts Climate Prediction Space Weather PAST WEATHER Past Weather Astronomical Data Certified Weather Data SAFETY INFORMATION Wireless Emergency Alerts Weather-Ready Nation Brochures Cooperative Observers Daily Briefing Damage/Fatality/Injury Statistics Forecast Models GIS Data Portal NOAA Weather Radio Publications SKYWARN Storm Spotters StormReady TsunamiReady Service Change Notices EDUCATION NEWS SEARCH Search For NWS All NOAA ABOUT About NWS Organization For NWS Employees National Centers Careers Contact Us Glossary Social Media NWS Transformation Office of Water Prediction National Program 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: [email protected] 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 NEW Key Messages NEW 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 Surveillance NEW 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 Follow us on X Follow us on Facebook Follow us on YouTube OWP RSS Feed US Dept of Commerce National Oceanic and Atmospheric Administration National Weather Service Office of Water Prediction 1325 East West Highway Silver Spring, MD 20910 Comments? Questions? Please Contact Us. Disclaimer Information Quality Help Glossary Privacy Policy Freedom of Information Act (FOIA) About Us Career Opportunities