FZUS51 KLWX 190859 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 458 AM EDT Tue May 19 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. ANZ500-192300- 458 AM EDT Tue May 19 2026 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... High pressure will continue to strengthen offshore today leading to increased south to southwesterly flow. Expect Small Craft Advisories for channeling this afternoon and evening before winds subside tonight. Additional Small Craft Advisories will be needed Wednesday into Thursday as a cold front crosses the waters. The front will bring scattered to numerous showers and thunderstorms Wednesday afternoon and evening. Special Marine Warnings may be needed for stronger thunderstorms during this time. No marine hazards are expected Thursday with Small Craft conditions returning FRiday into the weekend. $$ ANZ535-192300- Tidal Potomac from Key Bridge to Indian Head- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .TODAY...SW winds 5 to 10 kt. Waves 1 ft. .TONIGHT...S winds 5 to 10 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .THU...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .THU NIGHT...E winds around 5 kt. Waves 1 ft. Showers likely. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-192300- Tidal Potomac from Indian Head to Cobb Island- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...SW winds 5 kt. Waves less than 1 ft. .TODAY...SW winds 5 to 10 kt. Waves 1 ft. .TONIGHT...SW winds 5 to 10 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .THU...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .THU NIGHT...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning, then showers likely. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-192300- Tidal Potomac from Cobb Island to Smith Point- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...SW winds 10 kt. Waves 1 ft. .TODAY...SW winds 5 to 10 kt. Waves 1 ft. .TONIGHT...S winds 10 kt. Waves 1 to 2 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...NE winds 5 to 10 kt. Waves 1 to 2 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 2 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning, then showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-192300- Chesapeake Bay north of Pooles Island- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...SW winds 5 kt. Waves less than 1 ft. .TODAY...SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt until early morning. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .THU...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .THU NIGHT...E winds around 5 kt. Waves flat. A chance of showers. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-192300- Chesapeake Bay from Pooles Island to Sandy Point- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...S winds 10 kt. Waves 1 ft. .TODAY...S winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 to 2 ft. .TONIGHT...S winds 5 to 10 kt with gusts to 20 kt. Waves 1 to 2 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .WED NIGHT...N winds 10 to 15 kt. Waves 1 to 2 ft. Showers with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers likely. .THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers. .FRI...E winds 10 to 15 kt. Waves 1 to 2 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-192300- Patapsco River including Baltimore Harbor- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .TODAY...SW winds 5 to 10 kt. Waves 1 ft or less. .TONIGHT...SW winds 5 to 10 kt. Waves 1 ft. .WED...W winds 5 to 10 kt. Waves 1 ft or less. Showers with a chance of tstms. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .THU...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .THU NIGHT...E winds around 5 kt. Waves flat. A chance of showers. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ539-192300- Chester River to Queenstown MD- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...S winds 10 kt. Waves 1 ft. .TODAY...S winds 5 to 10 kt. Waves 1 ft. .TONIGHT...S winds 5 to 10 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .THU NIGHT...E winds 5 kt. Waves less than 1 ft. A chance of showers. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-192300- Chesapeake Bay from Sandy Point to North Beach- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...S winds 10 kt. Waves 1 ft. .TODAY...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Waves 1 to 2 ft. .TONIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...N winds 10 to 15 kt. Waves 1 to 2 ft. Showers with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 1 to 2 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely in the morning, then showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-192300- Eastern Bay- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...S winds 10 kt. Waves 1 ft. .TODAY...S winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...S winds 10 kt with gusts to 20 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely in the morning, then showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-192300- Chesapeake Bay from North Beach to Drum Point- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...S winds 10 kt. Waves 1 ft. .TODAY...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Waves 1 to 2 ft. .TONIGHT...S winds 10 to 15 kt...becoming SW late. Gusts up to 20 kt. Waves 2 ft. .WED...SW winds 5 to 10 kt. Waves 1 to 2 ft. A chance of showers. .WED NIGHT...NW winds 10 to 15 kt. Waves 1 to 2 ft. Showers with a chance of tstms. .THU...NE winds 15 to 20 kt. Waves 2 to 3 ft. Showers likely. .THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 1 to 2 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely in the morning, then showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-192300- Choptank River to Cambridge MD and the Little Choptank River- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...S winds 10 kt. Waves 1 ft. .TODAY...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers. .WED NIGHT...N winds 10 to 15 kt. Waves 1 ft. Showers with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers likely. .THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely in the morning, then showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-192300- Patuxent River to Broomes Island MD- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...SW winds 5 kt. Waves less than 1 ft. .TODAY...SW winds 5 to 10 kt. Waves 1 ft. .TONIGHT...S winds 5 to 10 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely in the morning, then showers. $$ ANZ534-192300- Chesapeake Bay from Drum Point to Smith Point- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...SW winds 10 kt. Waves 2 ft. .TODAY...S winds 10 to 15 kt. Gusts up to 20 kt... increasing to 25 kt late. Waves 2 to 3 ft. .TONIGHT...S winds 10 to 15 kt. Gusts up to 25 kt until early morning. Waves 2 to 3 ft. .WED...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .WED NIGHT...SW winds 10 to 15 kt...becoming N 5 to 10 kt after midnight. Gusts up to 20 kt. Waves 1 to 2 ft. Showers likely. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...NE winds 10 to 15 kt. Waves 2 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 2 ft. Showers. .SAT...SE winds 10 kt. Waves 1 to 2 ft. A chance of showers in the morning, then showers likely. $$ ANZ543-192300- Tangier Sound and the inland waters surrounding Bloodsworth Island- 458 AM EDT Tue May 19 2026 .REST OF THE OVERNIGHT...S winds 15 kt with gusts to 20 kt. Waves 2 ft. .TODAY...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TONIGHT...S winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft. .WED...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .WED NIGHT...SW winds 10 to 15 kt with gusts to 20 kt...becoming N 5 to 10 kt after midnight. Waves 1 to 2 ft. Showers likely. .THU...NE winds 10 to 15 kt. Waves 1 ft. Showers likely. .THU NIGHT...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 1 ft. Showers likely. .SAT...SE winds 10 kt. Waves 1 ft. A chance of showers in the morning, then showers likely. $$