FZUS51 KLWX 231156 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 756 AM EDT Sun Aug 23 2026 Tidal Potomac River and Maryland portion of Chesapeake Bay. Forecasts of wave heights do not include effects of wind direction relative to tidal currents. Expect higher waves when winds are blowing against the tidal flow. Waves flat where waters are iced over. ANZ500-232000- 756 AM EDT Sun Aug 23 2026 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... A weak area of low pressure will traverse the waters throughout the day today, bringing heavy showers and some thunderstorms. A cold front will move across the waters into Sunday, resulting in drier conditions returning. Weak high pressure builds over the waters for early next week bringing fair weather. $$ ANZ535-232000- Tidal Potomac from Key Bridge to Indian Head- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 5 to 10 kt. Waves 1 ft. .TONIGHT...W winds around 5 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds around 5 kt. Waves 1 ft. .TUE...W winds around 5 kt. Waves 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft or less. .WED...SE winds around 5 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning, then showers likely with a chance of tstms through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-232000- Tidal Potomac from Indian Head to Cobb Island- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 5 to 10 kt. Waves 1 ft. .TONIGHT...NW winds around 5 kt. Waves 1 ft. .MON...W winds around 5 kt. Waves 1 ft. .MON NIGHT...NW winds around 5 kt. Waves 1 ft. .TUE...NW winds around 5 kt. Waves 1 ft. .TUE NIGHT...SW winds around 5 kt. Waves 1 ft or less. .WED...E winds around 5 kt...becoming SE. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-232000- Tidal Potomac from Cobb Island to Smith Point- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 5 to 10 kt. Waves 1 ft. .TONIGHT...NW winds 5 kt. Waves less than 1 ft. .MON...W winds 5 kt. Waves less than 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...NW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...SW winds around 5 kt. Waves flat. .WED...SE winds 5 to 10 kt. Waves 1 ft or less... building to 1 to 2 ft. A chance of showers after midnight. .THU...S winds 5 to 10 kt. Waves 1 to 2 ft. A chance of showers in the morning, then showers likely with a chance of tstms through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-232000- Chesapeake Bay north of Pooles Island- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 10 kt. Waves 1 ft. .TONIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...NW winds around 5 kt. Waves 1 ft or less. .WED...SE winds around 5 kt...increasing to 5 to 10 kt. Waves 1 ft or less. A chance of showers and tstms after midnight. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of tstms. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-232000- Chesapeake Bay from Pooles Island to Sandy Point- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 10 kt. Waves 1 ft. .TONIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...NW winds 5 to 10 kt. Waves 1 ft or less. .WED...NE winds around 5 kt...becoming S. Waves 1 ft or less. A chance of showers and tstms after midnight. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of tstms. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-232000- Patapsco River including Baltimore Harbor- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 5 to 10 kt. Waves 1 ft or less. .TONIGHT...W winds 5 to 10 kt. Waves 1 ft or less. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft or less. .TUE...W winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...NW winds around 5 kt. Waves 1 ft or less. .WED...NE winds around 5 kt...becoming SE. Waves 1 ft or less. A chance of showers and tstms after midnight. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ539-232000- Chester River to Queenstown MD- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 10 kt. Waves 1 ft. .TONIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 kt. Waves less than 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft or less. .WED...SE winds around 5 kt...becoming S. Waves 1 ft or less. A chance of showers after midnight. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. $$ ANZ532-232000- Chesapeake Bay from Sandy Point to North Beach- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 10 kt. Waves 1 ft. .TONIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft or less. .WED...NE winds 5 kt...becoming SE 10 to 15 kt. Waves 1 ft or less... building to 2 ft. A chance of showers after midnight. .THU...S winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers in the morning, then showers likely with a chance of tstms through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-232000- Eastern Bay- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 10 kt. Waves 1 ft. .TONIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft or less. .WED...NE winds around 5 kt...becoming S. Waves 1 ft or less. A chance of showers after midnight. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. $$ ANZ533-232000- Chesapeake Bay from North Beach to Drum Point- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 10 kt. Waves 1 ft. .TONIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...SW winds 5 kt. Waves less than 1 ft. .WED...NE winds around 5 kt...becoming SE 10 to 15 kt. Waves 1 ft or less...building to 2 ft. A chance of showers after midnight. .THU...SE winds 10 to 15 kt...becoming SW 5 to 10 kt after midnight. Waves 1 to 2 ft. A chance of showers in the morning, then showers likely with a chance of tstms through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-232000- Choptank River to Cambridge MD and the Little Choptank River- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 10 kt. Waves 1 ft. .TONIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 kt. Waves less than 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...SW winds around 5 kt. Waves 1 ft or less. .WED...E winds around 5 kt...becoming S. Waves 1 ft or less. A chance of showers after midnight. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. A chance of tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-232000- Patuxent River to Broomes Island MD- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 5 to 10 kt. Waves 1 ft. .TONIGHT...NW winds around 5 kt. Waves 1 ft. .MON...W winds around 5 kt. Waves 1 ft. .MON NIGHT...NW winds around 5 kt. Waves 1 ft. .TUE...NW winds 5 kt. Waves less than 1 ft. .TUE NIGHT...SW winds around 5 kt. Waves 1 ft. .WED...NE winds around 5 kt...becoming SE. Waves 1 ft. A chance of showers after midnight. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning, then showers likely with a chance of tstms through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-232000- Chesapeake Bay from Drum Point to Smith Point- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 10 kt. Waves 1 ft. .TONIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...NW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...SW winds 5 kt. Waves less than 1 ft. .WED...SE winds 10 to 15 kt. Waves 1 ft or less... building to 2 ft. A chance of showers after midnight. .THU...SE winds 10 to 15 kt...becoming SW after midnight. Waves 1 to 2 ft. A chance of showers. A chance of tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-232000- Tangier Sound and the inland waters surrounding Bloodsworth Island- 756 AM EDT Sun Aug 23 2026 .TODAY...W winds 10 kt. Waves 1 ft. .TONIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...NW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...SW winds 5 kt. Waves less than 1 ft. .WED...SE winds 10 to 15 kt. Waves 1 ft or less. A chance of showers after midnight. .THU...SE winds 10 to 15 kt...becoming SW after midnight. Waves 1 ft. A chance of showers through the day. A chance of tstms. Showers likely through the night. Winds and waves higher and visibilities lower in and near tstms. $$