FZUS51 KLWX 090857 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 457 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. ANZ500-092300- 457 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 before settling south over the Carolinas by early next week. Special Marine Warnings may be needed for strong to severe thunderstorms through Saturday, but especially this afternoon and evening. $$ ANZ535-092300- Tidal Potomac from Key Bridge to Indian Head- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .TODAY...S winds around 5 kt. Waves 1 ft. Showers and numerous tstms. .TONIGHT...W winds around 5 kt. Waves 1 ft. Numerous showers and tstms. .FRI...W winds around 5 kt. Waves 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds around 5 kt. Waves 1 ft. A chance of showers and scattered tstms. .SAT...NW winds around 5 kt. Waves 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...N winds around 5 kt. Waves 1 ft. .SUN...E winds around 5 kt. Waves 1 ft. .MON...E winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-092300- Tidal Potomac from Indian Head to Cobb Island- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .TODAY...S winds around 5 kt. Waves 1 ft. Showers and numerous tstms. .TONIGHT...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. $$ ANZ537-092300- Tidal Potomac from Cobb Island to Smith Point- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 5 kt. Waves less than 1 ft. Isolated showers and tstms. .TODAY...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .TONIGHT...W winds 5 to 10 kt. Waves 1 ft. Numerous tstms. .FRI...W winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .SAT...NW winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...E winds 5 to 10 kt. Waves 1 to 2 ft. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-092300- Chesapeake Bay north of Pooles Island- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 5 kt. Waves less than 1 ft. Isolated showers and tstms. .TODAY...S winds 5 kt. Waves less than 1 ft. Showers and numerous tstms. .TONIGHT...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 5to 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. $$ ANZ531-092300- Chesapeake Bay from Pooles Island to Sandy Point- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 10 kt. Waves 1 ft. .TODAY...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .TONIGHT...SW winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .FRI...W winds 5 to 10 kt. Waves 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds 5 to 10 kt. Waves 1 ft. A chance of showers and scattered tstms. .SAT...N winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds 5 to 10 kt...becoming S after midnight. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-092300- Patapsco River including Baltimore Harbor- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 5 kt. Waves flat. Isolated showers and tstms. .TODAY...S winds 5 to 10 kt. Waves 1 ft or less. Showers and numerous tstms. .TONIGHT...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. $$ ANZ539-092300- Chester River to Queenstown MD- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .TODAY...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .TONIGHT...SW winds 5 kt. Waves less than 1 ft. Showers and numerous tstms. .FRI...W winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds 5 kt. Waves less than 1 ft. A chance of showers and scattered tstms. .SAT...NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SAT NIGHT...NE winds 5 kt. Waves less than 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft or less. .MON...E winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-092300- Chesapeake Bay from Sandy Point to North Beach- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 10 kt. Waves 1 ft. Isolated showers and tstms. .TODAY...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .TONIGHT...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. $$ ANZ540-092300- Eastern Bay- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .TODAY...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .TONIGHT...SW winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .FRI...W winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds around 5 kt. Waves 1 ft or less. A chance of showers and scattered tstms. .SAT...NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft or less. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-092300- Chesapeake Bay from North Beach to Drum Point- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 10 kt. Waves 1 ft. Isolated showers and tstms. .TODAY...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .TONIGHT...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. $$ ANZ541-092300- Choptank River to Cambridge MD and the Little Choptank River- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 5 kt. Waves less than 1 ft. Isolated showers and tstms. .TODAY...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .TONIGHT...SW winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .FRI...W winds 5 to 10 kt. Waves 1 ft. Scattered showers and tstms. .FRI NIGHT...W winds 5 kt. Waves less than 1 ft. A chance of showers and scattered tstms. .SAT...NW winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds 5 to 10 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-092300- Patuxent River to Broomes Island MD- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 5 kt. Waves less than 1 ft. Isolated showers and tstms. .TODAY...S winds 5 to 10 kt. Waves 1 ft. Showers and numerous tstms. .TONIGHT...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. $$ ANZ534-092300- Chesapeake Bay from Drum Point to Smith Point- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 10 kt. Waves 1 ft. Isolated showers and tstms. .TODAY...S winds 5 to 10 kt. Waves 1 to 2 ft. Numerous showers and scattered tstms. .TONIGHT...W winds 5 to 10 kt. Waves 1 ft. Showers and scattered tstms. .FRI...SW winds 5 to 10 kt. Waves 1 ft. .FRI NIGHT...W winds 5 to 10 kt. Waves 1 ft. Scattered showers and tstms. .SAT...NW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .SUN...E winds 5 to 10 kt. Waves 1 to 2 ft. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-092300- Tangier Sound and the inland waters surrounding Bloodsworth Island- 457 AM EDT Thu Jul 9 2026 .REST OF THE OVERNIGHT...S winds 10 kt. Waves 1 ft. .TODAY...S winds 5 to 10 kt. Waves 1 ft. Numerous showers and scattered tstms. .TONIGHT...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 in and near tstms. $$