FZUS51 KLWX 191827 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 227 PM 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. ANZ500-200800- 227 PM 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. $$ ANZ535-200800- Tidal Potomac from Key Bridge to Indian Head- 227 PM EDT Tue May 19 2026 .THIS AFTERNOON...SW winds 10 kt. Waves 1 ft. A slight chance of showers and tstms. .TONIGHT...SW winds 5 to 10 kt. Waves 1 ft. .WED...W winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 10 kt. Waves 1 ft. Showers. .THU NIGHT...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers, mainly in the morning. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-200800- Tidal Potomac from Indian Head to Cobb Island- 227 PM EDT Tue May 19 2026 .THIS AFTERNOON...SW winds 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. .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. Waves 1 ft. A chance of showers. .THU NIGHT...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers likely. .SAT...NE winds 5 kt. Waves less than 1 ft. Showers likely. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-200800- Tidal Potomac from Cobb Island to Smith Point- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .THIS AFTERNOON...S winds 10 kt. Waves 1 ft. .TONIGHT...S winds 10 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...N winds 5 to 10 kt. Waves 1 to 2 ft. A chance of showers and tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 2 ft. Showers likely. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-200800- Chesapeake Bay north of Pooles Island- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .THIS AFTERNOON...SW winds 10 kt with gusts to 20 kt. Waves 1 ft. A slight chance of showers and tstms. .TONIGHT...SW winds 5 to 10 kt. Waves 1 ft. .WED...W 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 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 through the day, then showers likely through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-200800- Chesapeake Bay from Pooles Island to Sandy Point- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .THIS AFTERNOON...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A slight chance of showers and tstms. .TONIGHT...S winds 10 to 15 kt with gusts to 20 kt... becoming SW 5 kt late. Waves 1 to 2 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers. .FRI...E winds 10 to 15 kt. Waves 1 to 2 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-200800- Patapsco River including Baltimore Harbor- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .THIS AFTERNOON...SW winds 10 kt. Waves 1 ft. A slight chance of showers and tstms. .TONIGHT...SW winds 5 to 10 kt. Waves 1 ft or less. .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 likely 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 or less. A chance of showers. .FRI...E winds 10 to 15 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. $$ ANZ539-200800- Chester River to Queenstown MD- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .THIS AFTERNOON...S winds 10 kt with gusts to 20 kt. Waves 1 ft. A slight chance of showers and tstms. .TONIGHT...S winds 10 kt. Waves 1 ft. .WED...SW winds 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .THU NIGHT...E winds 10 kt. Waves 1 ft. A chance of showers. .FRI...E winds 10 to 15 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-200800- Chesapeake Bay from Sandy Point to North Beach- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .THIS AFTERNOON...S winds 10 kt. Waves 1 to 2 ft. A slight chance of showers and tstms. .TONIGHT...S winds 10 kt. Waves 1 to 2 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...NW 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 2 ft. Showers likely. .THU NIGHT...NE winds 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. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-200800- Eastern Bay- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .THIS AFTERNOON...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A slight chance of showers and tstms. .TONIGHT...S winds 10 kt with gusts to 20 kt. Waves 1 ft. .WED...SW winds 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers with a chance oftstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .THU NIGHT...NE winds 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-200800- Chesapeake Bay from North Beach to Drum Point- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .THIS AFTERNOON...S winds 10 to 15 kt with gusts to 20 kt. 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...N winds 5 to 10 kt. Waves 2 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 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 2 ft. Showers likely. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-200800- Choptank River to Cambridge MD and the Little Choptank River- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .THIS AFTERNOON...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .WED...SW winds 10 kt. Waves 1 ft. A chance of showers. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .THU NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 1 ft. Showers likely. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-200800- Patuxent River to Broomes Island MD- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .THIS AFTERNOON...S winds 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...N winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 10 kt with gusts to 20 kt. Waves 1 ft. A chance of showers. .THU NIGHT...NE winds 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt...becoming NE 5 kt after midnight. Waves 1 ft. Showers likely. .SAT...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-200800- Chesapeake Bay from Drum Point to Smith Point- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... ...SMALL CRAFT ADVISORY IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING... .THIS AFTERNOON...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .TONIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. .WED...SW winds 10 to 15 kt...becoming S late. Gusts up to 20 kt. Waves 2 ft. .WED NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 3 ft... subsiding to 1 ft after midnight. A chance of showers. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 2 ft. Showers likely. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. A chance of tstms through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-200800- Tangier Sound and the inland waters surrounding Bloodsworth Island- 227 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... ...SMALL CRAFT ADVISORY IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING... .THIS AFTERNOON...S winds 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TONIGHT...S winds 10 to 15 kt with gusts to 20 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...becoming N 5 to 10 kt after midnight. Gusts up to 20 kt. Waves 1 to 2 ft. A chance of showers. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 1 ft. Showers likely. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. A chance of tstms through the night. Winds and waves higher and visibilities lower in and near tstms. $$