FZUS51 KLWX 090628 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 227 AM EDT Thu Jul 9 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. ANZ500-092000- 227 AM EDT Thu Jul 9 2026 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... A frontal zone will meander about the Mid Atlantic through Friday. Another cold front will push south across the waters this weekend. Special Marine Warnings may be needed for strong to severe thunderstorms Thursday through Saturday. $$ ANZ535-092000- Tidal Potomac from Key Bridge to Indian Head- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. Isolated showers and tstms. .THU...S winds around 5 kt. Waves 1 ft. Showers and numerous tstms. .THU NIGHT...W winds around 5 kt. Waves 1 ft. Numerous showers and tstms. .FRI...W winds around 5 kt. Waves 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds around 5 kt. Waves 1 ft. A chance of showers and scattered tstms. .SAT...NW winds around 5 kt. Waves 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...N winds around 5 kt. Waves 1 ft. .SUN...E winds around 5 kt. Waves 1 ft or less. .MON...E winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-092000- Tidal Potomac from Indian Head to Cobb Island- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. Isolated showers and tstms. .THU...S winds around 5 kt. Waves 1 ft. Showers and numerous tstms. .THU NIGHT...W winds around 5 kt. Waves 1 ft. Numerous tstms and scattered showers. .FRI...W winds around 5 kt. Waves 1 ft. Numerous showers and scattered tstms. .FRI NIGHT...W winds around 5 kt. Waves 1 ft. A chance of showers and scattered tstms. .SAT...NW winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...N winds around 5 kt. Waves 1 ft. .SUN...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-092000- Tidal Potomac from Cobb Island to Smith Point- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .THU NIGHT...W winds 5 to 10 kt. Waves 1 ft. Numerous tstms. .FRI...W winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .SAT...NW winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...E winds 5 to 10 kt. Waves 1 to 2 ft. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-092000- Chesapeake Bay north of Pooles Island- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. Isolated showers and tstms. .THU...S winds 5 kt. Waves less than 1 ft. Showers and numerous tstms. .THU NIGHT...SW winds around 5 kt. Waves 1 ft or less. Showers and numerous tstms. .FRI...W winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds around 5 kt. Waves 1 ft or less. A chance of showers. .SAT...N winds 5 kt. Waves flat. A chance of showers and tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft or less. .SUN...E winds 5 to 10 kt. Waves 1 ft or less. .MON...SE winds around 5 kt. Waves flat. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-092000- Chesapeake Bay from Pooles Island to Sandy Point- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 10 kt. Waves 1 ft. Isolated showers and tstms. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .THU NIGHT...SW winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .FRI...W winds 5 to 10 kt. Waves 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds 5 to 10 kt. Waves 1 ft. A chance of showers and scattered tstms. .SAT...N winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds 5 to 10 kt...becoming S after midnight. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-092000- Patapsco River including Baltimore Harbor- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 5 kt. Waves flat. Isolated showers and tstms. .THU...S winds 5 to 10 kt. Waves 1 ft or less. Showers and numerous tstms. .THU NIGHT...W winds 5 kt. Waves flat. Showers and numerous tstms. .FRI...W winds 5 to 10 kt. Waves 1 ft or less. Scattered showers and tstms. .FRI NIGHT...W winds around 5 kt. Waves 1 ft or less. A chance of showers and scattered tstms. .SAT...N winds 5 kt. Waves flat. A chance of showers and tstms. .SAT NIGHT...NE winds 5 kt. Waves less than 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...SE winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ539-092000- Chester River to Queenstown MD- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. Isolated showers and tstms. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .THU NIGHT...SW winds 5 kt. Waves less than 1 ft. Showers and numerous tstms. .FRI...W winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds 5 kt. Waves less than 1 ft. A chance of showers and scattered tstms. .SAT...NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SAT NIGHT...NE winds 5 kt. Waves less than 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft or less. .MON...E winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-092000- Chesapeake Bay from Sandy Point to North Beach- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 10 kt. Waves 1 ft. Isolated showers and tstms. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .THU NIGHT...SW winds 5 to 10 kt...becoming W late. Waves 1 ft. Showers and numerous tstms. .FRI...W winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds 5 kt. Waves less than 1 ft. A chance of showers and scattered tstms. .SAT...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-092000- Eastern Bay- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. Isolated showers and tstms. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .THU NIGHT...SW winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .FRI...W winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds around 5 kt. Waves 1 ft or less. A chance of showers and scattered tstms. .SAT...NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft or less. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-092000- Chesapeake Bay from North Beach to Drum Point- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 10 kt. Waves 1 ft. Isolated showers and tstms. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .THU NIGHT...W winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .FRI...W winds 5 to 10 kt. Waves 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds 5 to 10 kt. Waves 1 ft. A chance of showers and scattered tstms. .SAT...NW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-092000- Choptank River to Cambridge MD and the Little Choptank River- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 10 kt. Waves 1 ft. Isolated showers and tstms. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .THU NIGHT...SW winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .FRI...W winds 5 to 10 kt. Waves 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds 5 kt. Waves less than 1 ft. A chance of showers and scattered tstms. .SAT...NW winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds 5 to 10 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-092000- Patuxent River to Broomes Island MD- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .THU NIGHT...W winds 5 kt. Waves less than 1 ft. Showers and numerous tstms. .FRI...W winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds around 5 kt. Waves 1 ft. A chance of showers and scattered tstms. .SAT...NW winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...NE winds around 5 kt. Waves 1 ft. A chance of showers and tstms. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-092000- Chesapeake Bay from Drum Point to Smith Point- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 to 2 ft. Numerous showers and scattered tstms. .THU NIGHT...W winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .FRI NIGHT...W winds 5 to 10 kt. Waves 1 ft. Scattered showers and tstms. .SAT...NW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...E winds 5 to 10 kt. Waves 1 to 2 ft. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-092000- Tangier Sound and the inland waters surrounding Bloodsworth Island- 227 AM EDT Thu Jul 9 2026 .OVERNIGHT...S winds 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. Numerous showers and scattered tstms. .THU NIGHT...SW winds 5 to 10 kt. Waves 1 ft. Showers and scattered tstms. .FRI...W winds 5 to 10 kt. Waves 1 ft. .FRI NIGHT...W winds 5 to 10 kt. Waves 1 ft. A chance of showers and scattered tstms. .SAT...NW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower inand near tstms. $$