NWS Hydrologic Services

Water is necessary for sustaining life. Too much or too little water can have tremendous consequences. Thus, water information is critical for the health and safety of all citizens and the economic well being of our nation. As the nation grows, more segments of society become vulnerable to flooding. The National Weather Service is working to expand and improve hydrologic forecast and warning information in order to meet these growing demands.

Prototype of the National Water Model Visualization Services:

• Service Description Document
• Handbook

Stakeholder Engagement

• Social Science Evaluation of National Water Center Hydrologic Ensemble Forecast Service and National Water Model Output and Technical Support Services, October 2019  
• Social Science Evaluation of National Water Center Hydrologic Ensemble Forecast Service and National Water Model Output and Technical Support Services: Assessing Economic Benefits, October 2019
• Summary of Delaware and Penobscot River Watershed Engagements, July 2019 
• Stakeholder Engagement to Inform National Weather Service Hydrologic Products and Services to Meet User Needs, February 2019
• Summary of Engagements with Water Resources Managers, March 2018

Integrated Water Resources Science and Service Reports

• Waterloo, Iowa Stakeholder Report August 10, 2017
• Greenville, North Carolina Stakeholder Report June 21, 2017
• Maricopa County, Arizona Stakeholder Report April 19, 2017
• Austin, Texas Stakeholder Report February 8, 2017
• Final Russian River Basin Partner Report, January 2016
• Flash Flood Services for the Future: Flash Flood Summit and Focus Groups Report, May 2015
• Final Ohio Stakeholder Report, May 2015
• Russian River Basin Partner Report April 2, 2014
• Final Mid-Atlantic Stakeholder Report, March 2014
• Hudson River Basin Stakeholder Report June 27, 2013
• Susquehanna River Basin Commission Stakeholder Report February 28, 2013
• Potomac River Basin Stakeholder Report, February 6, 2013
• Delaware River Basin Commission Stakeholder Report December 13, 2012
  • 2013 with Optional Section on Hydrologic Services
  • 2011 with Optional Section on Hydrologic Services
  • 2004, 2006, 2008

Customer Satisfaction Survey for the NWS Hydrologic Services Program:

• Aptima Report on Improving the Display of River and Flash Flood Predictions
• David Ford Report on Evaluation of NWS Flood Severity Categories and Use of Gage Station Flood History Information
• CFI Group Report on Probability Focus Groups

NWS Annual Flood Loss Summary Reports

To U.S. Army Corps of Engineers

• Water year 2024
• Water year 2023
• Water year 2022
• Water year 2021
• Water year 2020
• Water year 2019
• Water year 2018
• Water year 2017
• Water year 2016
• Water year 2015
• Water year 2014
• Water year 2013
• Water year 2012
• Water year 2011
• Water year 2010
• Water year 2009
• Water year 2008
• Water year 2007

More Information

• NOAA/USGS Memorandum of Understanding (MOU)
• More Information Flowing on Freshwater Floods Caused by Hurricanes
  Over half the fatalities associated with hurricanes have been related to inland flooding during the past 30 years. One of the NWS’ major outreach campaigns is designed to raise the awareness of this danger.
• Use and Benefits of the National Weather Service River and Flood Forecasts