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Public Information Statement
National Weather Service Baltimore MD/Washington DC
1209 PM EDT Wed Apr 2 2025

To:     Subscribers:
        - Family of Services
        - NOAA Weather Wire Service
        - Emergency Managers Weather Information Network
        - Other NWS partners, users, and employees

From:   James E. Lee 
        Meteorologist in Charge 
        Baltimore MD/Washington DC Weather Forecast Office

Subject: Modification to Minor and Moderate flood categories for
the Washington D.C. tidal gauge located along the Washington
Channel at SW Waterfront (WASD2)

Effective at 12:00 Universal Coordinated Time (UTC) (8:00 AM EDT)
on Monday 7 April 2025, the National Weather Service will modify
the minor and moderate flood stages for WASD2.

The new flood categories will be as follows:

  1. The new minor flood stage will be 5.3 feet above Mean Lower 
    Low Water (MLLW). The previous minor flood stage was 4.2 feet 
    above MLLW.

 2. The new moderate flood stage will be 6.5 feet above MLLW. 
    The previous moderate flood stage was 5.3 feet above MLLW.

3. The major flood stage at this tidal gauge will remain
    unchanged at 7.0 feet above MLLW.

Therefore, starting at 12:00 UTC (8:00 AM EDT) on Monday 7 April
2025, Coastal Flood Advisories will reference the new minor flood
category and Coastal Flood Warnings will reference the new 
moderate flood category. This change is part of a re-evaluation of
tidal flood stages with local emergency managers and floodplain 
managers to reflect flooding impacts.

If you have any questions or comments on this change, please
contact:

Jeremy Geiger
Senior Service Hydrologist
National Weather Service 
Baltimore/Washington
43858 Weather Service Rd
Sterling, VA 20166

Phone: (571)888-3500
Email: Jeremy.Geiger@noaa.gov


$$