FZUS51 KLWX 180628 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 228 AM EDT Mon May 18 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. ANZ500-182000- 228 AM EDT Mon May 18 2026 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... High pressure will continue to strengthen offshore today through Tuesday leading to increased south to southwesterly flow. Expect Small Craft Advisories for channeling this afternoon and again Tuesday afternoon. Winds will subside during the late evening and overnight periods. 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. $$ ANZ535-182000- Tidal Potomac from Key Bridge to Indian Head- 228 AM EDT Mon May 18 2026 .OVERNIGHT...Light winds. Waves 1 ft. .MON...S winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...S winds 5 to 10 kt. Waves 1 ft. .TUE...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft. .TUE NIGHT...SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers likely. .THU...NE winds 5 to 10 kt. Waves 1 ft. Showers likely . .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers likely. $$ ANZ536-182000- Tidal Potomac from Indian Head to Cobb Island- 228 AM EDT Mon May 18 2026 .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .MON...S winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...S winds 5 to 10 kt. Waves 1 ft. .TUE...SW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers. .THU...NE winds 5 to 10 kt. Waves 1 ft. Showers likely . .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers likely. $$ ANZ537-182000- Tidal Potomac from Cobb Island to Smith Point- 228 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .MON...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .MON NIGHT...S winds 10 to 15 kt...becoming SW late. Gusts up to 20 kt. Waves 1 to 2 ft. .TUE...SW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...S winds 10 to 15 kt. Waves 2 ft. .WED...SW winds 10 to 15 kt. Waves 1 ft. A chance of showers. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers likely. .THU...NE winds 10 to 15 kt...diminishing to 5 to 10 kt after midnight. Waves 1 to 2 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 2 ft. Showers likely . $$ ANZ530-182000- Chesapeake Bay north of Pooles Island- 228 AM EDT Mon May 18 2026 .OVERNIGHT...SW winds 5 kt. Waves less than 1 ft. .MON...S winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...S winds 5 to 10 kt. Gusts up to 20 kt until early morning. Waves 1 ft. .TUE...SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .TUE NIGHT...SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers. .WED NIGHT...NW winds 10 to 15 kt. Waves 1 ft. Showers likely. .THU...N winds 10 to 15 kt...becoming E around 5 kt. Waves 1 ft. A chance of showers. .FRI...E winds 5 to 10 kt. Waves 1 ft. A chance of showers through the day, then showers likely through the night. $$ ANZ531-182000- Chesapeake Bay from Pooles Island to Sandy Point- 228 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .MON...S winds 10 to 15 kt with gusts to 20 kt. Waves flat... building to 2 ft in the afternoon. .MON NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .TUE...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Waves 1 to 2 ft. .TUE NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers. .WED NIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Waves 1 to 2 ft. Showers likely. .THU...NE winds 10 to 15 kt...becoming E around 5 kt. Waves 1 to 2 ft...subsiding to 1 ft or less. Showers likely through the day, then a chance of showers through the night. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers likely. $$ ANZ538-182000- Patapsco River including Baltimore Harbor- 228 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... .OVERNIGHT...Light winds. Waves flat. .MON...S winds 5 to 10 kt. Waves 1 ft or less. .MON NIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft. .TUE...SW winds 5 to 10 kt. Waves 1 ft or less. .TUE NIGHT...SW winds 5 to 10 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers likely. .THU...NE winds 5 to 10 kt. Waves 1 ft or less. A chance of showers. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers likely. $$ ANZ539-182000- Chester River to Queenstown MD- 228 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .MON...S winds 5 to 10 kt. Waves 1 ft or less. .MON NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TUE...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft. .TUE NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers. .WED NIGHT...NW winds 5 kt...becoming N 10 to 15 kt after midnight. Waves 1 to 2 ft. Showers likely. .THU...N winds 10 to 15 kt...becoming E around 5 kt. Waves 1 to 2 ft...subsiding to flat. Showers likely through the day, then a chance of showers through the night. .FRI...E winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning, then showers likely. $$ ANZ532-182000- Chesapeake Bay from Sandy Point to North Beach- 228 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .MON...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .MON NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. .TUE...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Waves 1 to 2 ft. .TUE NIGHT...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. .WED NIGHT...N winds 10 to 15 kt. Gusts up to 20 kt after midnight. Waves 1 to 2 ft. Showers. .THU...N winds 10 to 15 kt...becoming E 5 to 10 kt. Waves 1 to 2 ft. Showers likely . .FRI...E winds 10 to 15 kt. Waves 1 to 2 ft. Showers likely. $$ ANZ540-182000- Eastern Bay- 228 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .MON...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft or less. .MON NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TUE...S winds 10 kt. Waves 1 ft. .TUE NIGHT...S winds 10 to 15 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely. .WED NIGHT...N winds 10 to 15 kt. Gusts up to 20 kt after midnight. Waves 1 ft.Showers. .THU...N winds 10 to 15 kt...becoming E around 5 kt. Waves 1 ft or less. Showers likely through the day, then a chance of showers through the night. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers likely. $$ ANZ533-182000- Chesapeake Bay from North Beach to Drum Point- 228 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .MON...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .MON NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .TUE...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TUE NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .WED...SW winds 5 to 10 kt. Waves 1 to 2 ft. Showers likely. .WED NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers. .THU...N winds 15 to 20 kt...becoming E 5 to 10 kt. Waves 2 to 3 ft...subsiding to 1 ft. Showers likely . .FRI...E winds 10 to 15 kt. Waves 1 to 2 ft. Showers likely. $$ ANZ541-182000- Choptank River to Cambridge MD and the Little Choptank River- 228 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .MON...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft or less. .MON NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TUE...S winds 10 to 15 kt. Waves 1 ft. .TUE NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely. .WED NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers. .THU...N winds 10 to 15 kt...becoming E 5 kt. Waves 1 to 2 ft. Showers likely . .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers likely. $$ ANZ542-182000- Patuxent River to Broomes Island MD- 228 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... .OVERNIGHT...S winds 5 kt. Waves less than 1 ft. .MON...S winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...S winds 5 to 10 kt. Gusts up to 20 kt until early morning. Waves 1 ft. .TUE...SW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...S winds 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...N winds 10 to 15 kt...becoming NE 5 kt. Waves 1 ft. Showers likely. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers likely . $$ ANZ534-182000- Chesapeake Bay from Drum Point to Smith Point- 228 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... .OVERNIGHT...S winds 10 kt. Waves 1 ft. .MON...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .MON NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. .TUE...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. .TUE NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. .WED...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .WED NIGHT...W winds 10 to 15 kt...becoming N 5 to 10 kt after midnight. Waves 1 to 2 ft. Showers likely. .THU...NE winds 10 to 15 kt...diminishing to 5 to 10 kt. Waves 1 to 2 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 2 ft. Showers likely . $$ ANZ543-182000- Tangier Sound and the inland waters surrounding Bloodsworth Island- 228 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... .OVERNIGHT...S winds 10 kt. Waves 1 ft. .MON...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft. .MON NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .TUE...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TUE NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves2 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. Showers likely. .THU...NE winds 10 to 15 kt...diminishing to 5 to 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt. Waves 1 ft. Showers likely . $$