Coastal Waters Forecast
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
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006 FZUS51 KLWX 170535 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 135 AM EDT Thu Jul 17 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. ANZ500-172000- 135 AM EDT Thu Jul 17 2025 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... A cold front will move over the waters Thursday night. Another cold front may move over the waters Sunday night. Small Craft Advisories may be needed Thursday night for portions of the waters. $$ ANZ535-172000- Tidal Potomac from Key Bridge to Indian Head- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 5 to 10 kt. Waves 1 ft. A slight chance of showers and tstms. .THU...SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .THU NIGHT...W winds 5 to 10 kt. Waves 1 ft. .FRI...NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .FRI NIGHT...E winds around 5 kt. Waves 1 ft or less. A chance of showers and tstms. .SAT...SE winds around 5 kt. Waves 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...SW winds around 5 kt. Waves 1 ft. A chance of showers and tstms. .SUN...NW winds around 5 kt. Waves 1 ft. A chance of showers and tstms through the night. .MON...NE winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-172000- Tidal Potomac from Indian Head to Cobb Island- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 10 kt with gusts to 20 kt. Waves 1 ft. A slight chance of showers and tstms. .THU...SW winds 10 kt with gusts to 20 kt. Waves 1 ft. .THU NIGHT...W winds 5 to 10 kt. Waves 1 ft. .FRI...N winds around 5 kt. Waves 1 ft. A chance of showers and tstms. .FRI NIGHT...SE winds around 5 kt. Waves 1 ft or less. A chance of showers and tstms. .SAT...SE winds around 5 kt. Waves 1 ft. A chance of showers and tstms. .SAT NIGHT...SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SUN...NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms through the night. .MON...NE winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-172000- Tidal Potomac from Cobb Island to Smith Point- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 15 kt with gusts to 25 kt. Waves 2 ft. A slight chance of showers. .THU...SW winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft. .THU NIGHT...SW winds 10 to 15 kt with gusts to 20 kt...becoming W 5 to 10 kt late. Waves 1 to 2 ft. .FRI...N winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .FRI NIGHT...SE winds around 5 kt. Waves 1 ft or less. A chance of showers and tstms. .SAT...SE winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .MON...NE winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-172000- Chesapeake Bay north of Pooles Island- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 10 kt. Waves 1 ft. A chance of showers and tstms. Vsby 1 NM or less. .THU...SW winds 10 kt with gusts to 20 kt. Waves 1 ft. .THU NIGHT...W winds 5 to 10 kt...becoming NW late. Waves 1 ft. .FRI...N winds 5 to 10 kt. Waves 1 ft. .FRI NIGHT...NE winds 5 kt. Waves flat. .SAT...SE winds 5 kt. Waves flat. A chance of showers. .SAT NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers. A chance of tstms through the night. .MON...NE winds 5 to 10 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-172000- Chesapeake Bay from Pooles Island to Sandy Point- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 10 kt with gusts to 20 kt. Waves 1 to 2 ft. A chance of showers and tstms. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .THU NIGHT...W winds 10 kt...becoming NW late. Waves 1 to 2 ft. .FRI...N winds 5 to 10 kt. Waves 1 ft. .FRI NIGHT...NE winds 5 kt. Waves less than 1 ft. .SAT...SE winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SAT NIGHT...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms through the night. .MON...NE winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-172000- Patapsco River including Baltimore Harbor- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .THU...SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .THU NIGHT...W winds 5 to 10 kt. Waves 1 ft. .FRI...N winds 5 kt. Waves flat. .FRI NIGHT...E winds around 5 kt. Waves flat. .SAT...SE winds around 5 kt. Waves 1 ft or less. Showers likely with a chance of tstms. .SAT NIGHT...SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SUN...NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms through the night. .MON...NE winds 5 kt. Waves less than 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ539-172000- Chester River to Queenstown MD- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 10 kt with gusts to 20 kt. Waves 1 to 2 ft. A chance of showers and tstms. .THU...SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .THU NIGHT...W winds 5 to 10 kt...becoming NW late. Waves 1 ft. .FRI...N winds 5 to 10 kt. Waves 1 ft. .FRI NIGHT...E winds around 5 kt. Waves flat. .SAT...SE winds 5 kt. Waves flat. A chance of showers and tstms. .SAT NIGHT...SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SUN...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms through the night. .MON...NE winds 5 to 10 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-172000- Chesapeake Bay from Sandy Point to North Beach- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 15 kt with gusts to 20 kt. Waves 2 ft. A slight chance of showers and tstms. .THU...SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .THU NIGHT...W winds 5 to 10 kt...becoming NW late. Waves 1 to 2 ft. .FRI...N winds 5 to 10 kt. Waves 1 ft. .FRI NIGHT...E winds 5 kt. Waves less than 1 ft. A chance of showers. .SAT...SE winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms through the night. .MON...NE winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-172000- Eastern Bay- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A chance of showers and tstms. .THU...SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .THU NIGHT...W winds 5 to 10 kt...becoming NW late. Waves 1 ft. .FRI...N winds 5 to 10 kt. Waves 1 ft. .FRI NIGHT...E winds around 5 kt. Waves flat. A chance of showers. .SAT...SE winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms through the night. .MON...NE winds 5 to 10 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-172000- Chesapeake Bay from North Beach to Drum Point- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 15 kt with gusts to 20 kt. Waves 2 ft. A slight chance of showers and tstms. .THU...SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .THU NIGHT...W winds 5 to 10 kt. Waves 1 to 2 ft. .FRI...N winds 5 to 10 kt. Waves 1 ft. .FRI NIGHT...E winds 5 kt. Waves less than 1 ft. A chance of showers. .SAT...SE winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms through the night. .MON...NE winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-172000- Choptank River to Cambridge MD and the Little Choptank River- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers and tstms. .THU...SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .THU NIGHT...W winds 5 to 10 kt. Waves 1 ft. .FRI...N winds 5 to 10 kt. Waves 1 ft. .FRI NIGHT...E winds around 5 kt. Waves flat. A chance of showers. .SAT...SE winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SAT NIGHT...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms through the night. .MON...NE winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-172000- Patuxent River to Broomes Island MD- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 10 kt with gusts to 20 kt. Waves 1 ft. A slight chance of showers and tstms. .THU...SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .THU NIGHT...W winds 5 to 10 kt. Waves 1 ft. .FRI...N winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .FRI NIGHT...E winds around 5 kt. Waves 1 ft. A chance of showers and tstms. .SAT...SE winds around 5 kt. Waves 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SUN...NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms through the night. .MON...NE winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-172000- Chesapeake Bay from Drum Point to Smith Point- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. A slight chance of showers and tstms. .THU...SW winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. .THU NIGHT...SW winds 10 to 15 kt...becoming W late. Gusts up to 20 kt. Waves 2 ft. .FRI...N winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .FRI NIGHT...NE winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SAT...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SAT NIGHT...SW winds 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .MON...NE winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-172000- Tangier Sound and the inland waters surrounding Bloodsworth Island- 135 AM EDT Thu Jul 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .OVERNIGHT...SW winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. A slight chance of showers and tstms. .THU...SW winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. .THU NIGHT...SW winds 10 to 15 kt...becoming W late. Gusts up to 20 kt. Waves 1 to 2 ft. .FRI...NW winds 5 to 10 kt. Waves 1 ft. .FRI NIGHT...NE winds 5 kt. Waves less than 1 ft. A chance of showers. .SAT...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SAT NIGHT...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...W winds 5 to 10 kt. Waves 1 ft. A chance of showers. A chance of tstms. .MON...NE winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$