FZUS51 KLWX 222357 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 757 PM EDT Sat Aug 22 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. ANZ500-230800- 757 PM EDT Sat Aug 22 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. $$ ANZ535-230800- Tidal Potomac from Key Bridge to Indian Head- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 5 kt. Waves less than 1 ft. Numerous showers and scattered tstms this evening, then scattered showers with isolated tstms after midnight. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...W winds around 5 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds around 5 kt. Waves 1 ft. .TUE...NW winds around 5 kt. Waves 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft or less. .WED...SE winds around 5 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-230800- Tidal Potomac from Indian Head to Cobb Island- 757 PM EDT Sat Aug 22 2026 .TONIGHT...S winds 5 kt. Waves less than 1 ft. Scattered showers and tstms this evening, then scattered showers with isolated tstms after midnight. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...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. A chance of tstms through the night. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-230800- Tidal Potomac from Cobb Island to Smith Point- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 5 kt...becoming SW after midnight. Waves 1 ft. Scattered showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 kt. Waves less than 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...NW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...S winds around 5 kt. Waves flat. .WED...E winds 5 to 10 kt...becoming SE. Waves 1 ft or less. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of tstms through the night. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-230800- Chesapeake Bay north of Pooles Island- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 5 to 10 kt. Waves 1 ft. Numerous showers and scattered tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. Scattered showers. .SUN NIGHT...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 kt. Waves less than 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft or less. .WED...SE winds around 5 kt. Waves 1 ft or less. .THU...SE 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. $$ ANZ531-230800- Chesapeake Bay from Pooles Island to Sandy Point- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 10 kt...becoming S late. Waves 1 ft. Numerous showers and scattered tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. Scattered showers. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft or less. .WED...E winds around 5 kt...becoming SE. Waves 1 ft or less. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-230800- Patapsco River including Baltimore Harbor- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 5 kt. Waves less than 1 ft. Numerous showers and scattered tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...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 kt. Waves flat. .TUE NIGHT...W winds around 5 kt. Waves flat. .WED...SE winds around 5 kt. 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. $$ ANZ539-230800- Chester River to Queenstown MD- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. Scattered showers. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 kt. Waves less than 1 ft. .TUE...W winds 5 kt. Waves less than 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft or less. .WED...SE winds around 5 kt. Waves 1 ft or less. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of tstms through the night. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-230800- Chesapeake Bay from Sandy Point to North Beach- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 10 kt...becoming SW late. Waves 1 ft. Scattered showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...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 5 kt. Waves less than 1 ft. .WED...NE winds 5 kt...becoming SE. Waves 1 ft or less. A chance of showers after midnight. .THU...S winds 10 to 15 kt...becoming SW 5 to 10 kt 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. $$ ANZ540-230800- Eastern Bay- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds around 5 kt. Waves 1 ft. .TUE NIGHT...W winds around 5 kt. Waves flat. .WED...E winds 5 kt...becoming SE. Waves 1 ft or less. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-230800- Chesapeake Bay from North Beach to Drum Point- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 10 kt...becoming SW late. Waves 1 ft. Scattered showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...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 5 kt. Waves less than 1 ft. .WED...NE winds 5 kt...becoming SE. Waves 1 ft or less...building to 2 ft. .THU...S winds 10 to 15 kt...becoming SW 5 to 10 kt after midnight. Waves 1 to 2 ft. A chance of showers. A chance of tstms through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-230800- Choptank River to Cambridge MD and the Little Choptank River- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 5 to 10 kt...becoming SW late. Waves 1 ft. Scattered showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 kt. Waves less than 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...SW winds around 5 kt. Waves 1 ft or less. .WED...SE winds around 5 kt...increasing to 5 to 10 kt. Waves 1 ft or less. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. A chance of tstms through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-230800- Patuxent River to Broomes Island MD- 757 PM EDT Sat Aug 22 2026 .TONIGHT...S winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...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. .WED...NE winds around 5 kt...becoming SE. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-230800- Chesapeake Bay from Drum Point to Smith Point- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 10 kt...becoming SW after midnight. Waves 1 ft. Scattered showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...NW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...S winds 5 kt. Waves less than 1 ft. .WED...SE winds 10 to 15 kt...becoming S after midnight. Waves 1 to 2 ft. A chance of showers after midnight. .THU...S winds 10 to 15 kt...becoming SW 5 to 10 kt after midnight. Waves 1 to 2 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-230800- Tangier Sound and the inland waters surrounding Bloodsworth Island- 757 PM EDT Sat Aug 22 2026 .TONIGHT...SE winds 10 kt...becoming SW after midnight. Waves 1 ft. Scattered showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...NW winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...NW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...S 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...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$