Coastal Waters Forecast
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
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520 FZUS51 KLWX 220834 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 434 AM EDT Tue Jul 22 2025 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- 434 AM EDT Tue Jul 22 2025 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... Canadian High Pressure remains in place across the region through the middle of the week. Summertime thunderstorms return to the forecast late this week into the weekend. Small Craft Advisories may be needed for southerly channeling in the Chesapeake Bay Thursday evening into Thursday night. $$ ANZ535-222300- Tidal Potomac from Key Bridge to Indian Head- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 5 kt. Waves less than 1 ft. .TODAY...NE winds 5 kt. Waves less than 1 ft. .TONIGHT...E winds around 5 kt. Waves 1 ft. .WED...E winds around 5 kt. Waves 1 ft. .WED NIGHT...S winds around 5 kt. Waves 1 ft. .THU...S winds around 5 kt. Waves 1 ft. .THU NIGHT...S winds 5 kt. Waves less than 1 ft. .FRI...SW winds around 5 kt. Waves 1 ft. .SAT...NW winds around 5 kt. Waves 1 ft or less. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-222300- Tidal Potomac from Indian Head to Cobb Island- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 5 kt. Waves less than 1 ft. .TODAY...NE winds 5 kt. Waves less than 1 ft. .TONIGHT...E winds around 5 kt. Waves 1 ft. .WED...E winds around 5 kt. Waves 1 ft. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. .THU...S winds around 5 kt. Waves 1 ft. .THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. .FRI...SW winds around 5 kt. Waves 1 ft. .SAT...W winds around 5 kt. Waves 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-222300- Tidal Potomac from Cobb Island to Smith Point- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 10 kt. Waves 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft. .TONIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...SE winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. .THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .SAT...W winds 5 kt. Waves less than 1 ft. A chance of showers and tstms through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-222300- Chesapeake Bay north of Pooles Island- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 10 kt. Waves 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft. .TONIGHT...E winds 5 kt. Waves less than 1 ft. .WED...SE winds 5 kt. Waves less than 1 ft. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. .THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .SAT...NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-222300- Chesapeake Bay from Pooles Island to Sandy Point- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 10 kt. Waves 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft. .TONIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...SE winds 5 kt. Waves less than 1 ft. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. .THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .SAT...SW winds 5 kt. Waves flat. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-222300- Patapsco River including Baltimore Harbor- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 5 kt. Waves less than 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft or less. .TONIGHT...E winds 5 kt. Waves less than 1 ft. .WED...SE winds around 5 kt. Waves 1 ft or less. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft or less. .THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. .FRI...SW winds around 5 kt. Waves 1 ft or less. .SAT...E winds around 5 kt. Waves flat. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ539-222300- Chester River to Queenstown MD- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 10 kt. Waves 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft. .TONIGHT...E winds 5 kt. Waves less than 1 ft. .WED...SE winds 5 kt. Waves flat. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 kt. Waves less than 1 ft. .THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .SAT...W winds 5 kt. Waves flat. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-222300- Chesapeake Bay from Sandy Point to North Beach- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 10 kt. Waves 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft. .TONIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...SE winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. .THU NIGHT...S winds 5 to 10 kt. Waves 2 ft. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .SAT...N winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-222300- Eastern Bay- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 10 kt. Waves 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft. .TONIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...SE winds 5 kt. Waves flat. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft or less. .THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .SAT...W winds 5 kt. Waves flat. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-222300- Chesapeake Bay from North Beach to Drum Point- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 10 kt. Waves 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft. .TONIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. .THU NIGHT...S winds 5 to 10 kt. Waves 1 to 2 ft. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .SAT...NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-222300- Choptank River to Cambridge MD and the Little Choptank River- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 10 kt. Waves 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft. .TONIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 kt. Waves less than 1 ft. .WED NIGHT...SE winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. .THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .SAT...W winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-222300- Patuxent River to Broomes Island MD- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 5 kt. Waves less than 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft. .TONIGHT...E winds 5 kt. Waves less than 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...SE winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. .THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .SAT...NW winds around 5 kt. Waves 1 ft. A chance of showers and tstms through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-222300- Chesapeake Bay from Drum Point to Smith Point- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 10 kt. Waves 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft. .TONIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...SE winds 5 to 10 kt. Waves 1 to 2 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. .THU NIGHT...S winds 10 kt. Waves 2 ft. .FRI...SW winds 5 to 10 kt. Waves 1 to 2 ft. .SAT...NW winds 5 to 10 kt...becoming SW. Waves 1 ft. A chance of showers and tstms through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-222300- Tangier Sound and the inland waters surrounding Bloodsworth Island- 434 AM EDT Tue Jul 22 2025 .REST OF THE OVERNIGHT...NE winds 10 kt. Waves 1 ft. .TODAY...NE winds 5 to 10 kt. Waves 1 ft. .TONIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...SE winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. .THU NIGHT...S winds 10 kt. Waves 1 ft. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .SAT...W winds 5 to 10 kt...becoming SW. Waves 1 ft. A chance of showers and tstms through the night. Winds and waves higher and visibilities lower in and near tstms. $$