FZUS51 KLWX 220857 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 457 AM 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. ANZ500-222300- 457 AM 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 conditiosn returning. Weak high pressure builds over the waters for early next week bringing fair weather. $$ ANZ535-222300- Tidal Potomac from Key Bridge to Indian Head- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...Light winds. Waves flat. Numerous showers with isolated tstms. .TODAY...E winds around 5 kt. Waves 1 ft. Showers and scattered tstms. .TONIGHT...S winds around 5 kt. Waves 1 ft. A chance of showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...NW winds around 5 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds around 5 kt. Waves 1 ft. .TUE...W winds around 5 kt. Waves 1 ft or less. .WED...S winds around 5 kt. Waves 1 ft. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-222300- Tidal Potomac from Indian Head to Cobb Island- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...SE winds 5 kt. Waves flat. Showers with isolated tstms. .TODAY...E winds around 5 kt. Waves 1 ft. Showers and scattered tstms. .TONIGHT...S winds around 5 kt. Waves 1 ft. A chance of showers. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 kt. Waves less than 1 ft. .MON...W winds 5 kt. Waves less than 1 ft. .MON NIGHT...NW winds 5 kt. Waves less than 1 ft. .TUE...W winds around 5 kt. Waves 1 ft or less. .WED...S winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-222300- Tidal Potomac from Cobb Island to Smith Point- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...SE winds 5 kt. Waves less than 1 ft. Showers with isolated tstms. .TODAY...E winds 5 to 10 kt. Waves 1 ft. Showers and scattered tstms. .TONIGHT...SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...NW winds 5 kt. Waves less than 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds around 5 kt. Waves 1 ft or less. .WED...S winds 5 to 10 kt. Waves 1 ft or less. A chance of showers through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-222300- Chesapeake Bay north of Pooles Island- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...E winds 5 kt. Waves less than 1 ft. Isolated showers. .TODAY...E winds 5 to 10 kt. Waves 1 ft. Numerous showers and scattered tstms. .TONIGHT...SE winds 5 to 10 kt...becoming SW late. Waves 1 ft. Showers likely with a chance of tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. A chance of 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 around 5 kt. Waves 1 ft or less. .WED...W winds around 5 kt...becoming S. Waves 1 ft or less. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-222300- Chesapeake Bay from Pooles Island to Sandy Point- 457 AM EDT Sat Aug 22 2026 .REST OF THEOVERNIGHT...SE winds 5 kt. Waves flat. Scattered showers. .TODAY...E winds 5 to 10 kt. Waves 1 ft. Numerous showers and scattered tstms. .TONIGHT...SE winds 5 to 10 kt...becoming SW late. Waves 1 ft. Showers likely. .SUN...W winds 5 to 10 kt. Waves 1 ft. A chance of showers. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft or less. .WED...N winds around 5 kt...becoming S. Waves 1 ft or less. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-222300- Patapsco River including Baltimore Harbor- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...SE winds 5 kt. Waves flat. Scattered showers. .TODAY...E winds 5 to 10 kt. Waves 1 ft. Numerous showers and scattered tstms. .TONIGHT...E winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft or less. Showers likely. .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 or less. .TUE...W winds around 5 kt. Waves 1 ft or less. .WED...N winds around 5 kt...becoming S. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ539-222300- Chester River to Queenstown MD- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...SE winds 5 kt. Waves flat. Scattered showers. .TODAY...E winds 5 kt. Waves less than 1 ft. Showers and scattered tstms. .TONIGHT...SE winds around 5 kt. Waves 1 ft or less. A chance of showers. .SUN...W winds 5 to 10 kt. Waves 1 ft. A chance of showers. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds around 5 kt. Waves 1 ft or less. .WED...W winds around 5 kt...becoming S. Waves 1 ft or less. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-222300- Chesapeake Bay from Sandy Point to North Beach- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...SE winds 5 kt. Waves less than 1 ft. Scattered showers with isolated tstms. .TODAY...E winds 5 to 10 kt. Waves 1 ft. Numerous showers and scattered tstms. .TONIGHT...SE winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft. A chance of showers. .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. .WED...NW winds around 5 kt...becoming S. Waves 1 ft or less... building to 2 ft. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-222300- Eastern Bay- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...SE winds 5 kt. Waves flat. Numerous showers. .TODAY...E winds 5 to 10 kt. Waves 1 ft. Showers and scattered tstms. .TONIGHT...SE winds 5 to 10 kt...becoming SW late. Waves 1 ft or less. A chance of showers. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds around 5 kt. Waves 1 ft or less. .WED...E winds around 5 kt...becoming S. Waves 1 ft or less. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-222300- Chesapeake Bay from North Beach to Drum Point- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...SE winds 5 kt. Waves less than 1 ft. Showers with isolated tstms. .TODAY...E winds 5 to 10 kt. Waves 1 ft. Showers and scattered tstms. .TONIGHT...SE winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft. A chance of showers. .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...W winds 5 to 10 kt. Waves 1 ft. .WED...S winds 5 to 10 kt. Waves 1 ft or less... building to 2 ft. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-222300- Choptank River to Cambridge MD and the Little Choptank River- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...SE winds 5 kt. Waves less than 1 ft. Numerous showers with isolated tstms. .TODAY...E winds 5 to 10 kt. Waves 1 ft. Showers and scattered tstms. .TONIGHT...SE winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft. A chance of showers. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...NW winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft. .WED...SE winds 5 to 10 kt. Waves 1 ft or less. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-222300- Patuxent River to Broomes Island MD- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...E winds 5 kt. Waves less than 1 ft. Showers with isolated tstms. .TODAY...E winds 5 to 10 kt. Waves 1 ft. Showers and scattered tstms. .TONIGHT...S winds around 5 kt. Waves 1 ft. A chance of showers. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 kt. Waves less than 1 ft. .MON...NW winds 5 kt. Waves less than 1 ft. .MON NIGHT...NW winds around 5 kt. Waves 1 ft. .TUE...W winds around 5 kt. Waves 1 ft. .WED...S winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-222300- Chesapeake Bay from Drum Point to Smith Point- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...E winds 10 kt. Waves 1 ft. Showers with isolated tstms. .TODAY...E winds 5 to 10 kt. Waves 2 ft. Showers and scattered tstms. .TONIGHT...S winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft. A chance of showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...NW winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...NW winds 5 to 10 kt...becoming SW. Waves 1 ft. .WED...S winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-222300- Tangier Sound and the inland waters surrounding Bloodsworth Island- 457 AM EDT Sat Aug 22 2026 .REST OF THE OVERNIGHT...E winds 10 kt. Waves 1 ft. Numerous showers with isolated tstms. .TODAY...E winds 5 to 10 kt. Waves 1 ft. Showers and scattered tstms. .TONIGHT...SE winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft. A chance of 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...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...becoming SW. Waves 1 ft. .WED...S winds 10 to 15 kt. Waves 1 ft or less. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$