FZUS51 KLWX 180627 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 226 AM EDT Sat Apr 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- 226 AM EDT Sat Apr 18 2026 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... It will remain very warm and dry through today as high pressure remains off the southeastern U.S. coast. A cold front late Saturday night will bring the next chance for widespread showers. Small Craft Advisories are in effect for most waters at times Saturday afternoon through Sunday evening. Additional Small Craft Advisories are possible in northwest flow on Monday. $$ ANZ535-182000- Tidal Potomac from Key Bridge to Indian Head- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .OVERNIGHT...Light winds. Waves flat. .SAT...SE winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft. .SAT NIGHT...SE winds 10 to 15 kt with gusts to 25 kt...diminishing to 5 kt after midnight, then becoming N late. Waves 1 ft. A chance of showers. .SUN...NW winds 15 to 20 kt with gusts to 30 kt. Waves 1 to 2 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft. .MON...NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...SW winds around 5 kt. Waves 1 ft. .WED...W winds around 5 kt. Waves 1 ft or less. A chance of showers through the night. $$ ANZ536-182000- Tidal Potomac from Indian Head to Cobb Island- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .OVERNIGHT...NE winds around 5 kt. Waves flat. .SAT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .SAT NIGHT...SE winds 10 to 15 kt...becoming W 5 to 10 kt late. Gusts up to 20 kt. Waves 1 to 2 ft. A chance of showers. .SUN...NW winds 20 to 25 kt...diminishing to 10 to 15 kt in the afternoon. Gusts up to 30 kt. Waves 2 to 3 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers. .MON...NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...W winds around 5 kt...becoming S. Waves 1 ft. .WED...W winds 5 to 10 kt...becoming N after midnight. Waves 1 ft. A chance of showers through the night. $$ ANZ537-182000- Tidal Potomac from Cobb Island to Smith Point- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH SUNDAY AFTERNOON... .OVERNIGHT...NE winds around 5 kt. Waves flat. .SAT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .SAT NIGHT...SE winds 15 to 20 kt...becoming SW 10 to 15 kt late. Waves 2 ft. .SUN...NW winds 15 to 20 kt with gusts to 30 kt. Waves 3 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. A chance of showers. .MON...NW winds 10 to 15 kt. Waves 1 to 2 ft. .MON NIGHT...N winds 10 to 15 kt. Waves 1 to 2 ft. .TUE...N winds 5 to 10 kt...becoming SE 10 to 15 kt in the afternoon and evening, then becoming S after midnight. Waves 1 to 2 ft. .WED...SW winds 10 to 15 kt...becoming NW 5 kt. Waves 1 to 2 ft. $$ ANZ530-182000- Chesapeake Bay north of Pooles Island- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .OVERNIGHT...E winds 5 kt. Waves less than 1 ft. .SAT...SE winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft. .SAT NIGHT...SE winds 10 to 15 kt with gusts to 20 kt...becoming NE 5 to 10 kt late. Waves 1 ft. A chance of showers. .SUN...NW winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. Showers. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 ft. A chance of showers. .MON...NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...W winds around 5 kt...becoming S. Waves 1 ft. .WED...SW winds 5 to 10 kt...becoming N. Waves 1 ft. $$ ANZ531-182000- Chesapeake Bay from Pooles Island to Sandy Point- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .OVERNIGHT...NE winds 5 kt. Waves flat. .SAT...E winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Waves 1 to 2 ft. .SAT NIGHT...SE winds 10 to 15 kt with gusts to 20 kt...becoming NE 5 to 10 kt late. Waves 1 to 2 ft. A chance of showers. .SUN...NW winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. Showers. .SUN NIGHT...NW winds 10 to 15 kt...becoming W 5 to 10 kt after midnight. Waves 1 to 2 ft. A chance of showers. .MON...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .MON NIGHT...N winds 10 to 15 kt. Waves 1 to 2 ft. .TUE...N winds 5 kt...becoming S 10 to 15 kt. Waves 1 to 2 ft. .WED...SW winds 10 to 15 kt...becoming N 5 kt. Waves 1 ft or less. $$ ANZ538-182000- Patapsco River including Baltimore Harbor- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .OVERNIGHT...NE winds 5 kt. Waves flat. .SAT...E winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft. .SAT NIGHT...SE winds 10 to 15 kt with gusts to 20 kt...becoming NE 5 kt after midnight. Waves 1 ft. A chance of showers. .SUN...NW winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers. .MON...NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft or less. .TUE...E winds around 5 kt...becoming S. Waves 1 ft or less. .WED...NW winds around 5 kt. Waves 1 ft or less. $$ ANZ539-182000- Chester River to Queenstown MD- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .OVERNIGHT...NE winds 5 kt. Waves flat. .SAT...E winds 5 to 10 kt. Waves 1 ft. .SAT NIGHT...SE winds 5 to 10 kt...becoming NE late. Waves 1 ft. A chance of showers. .SUN...NW winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. A chance of showers. .MON...NW winds 5 to 10 kt. Waves 2 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 to 2 ft. .TUE...W winds 5 kt...becoming S 10 to 15 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt...becoming N. Waves 1 ft or less. $$ ANZ532-182000- Chesapeake Bay from Sandy Point to North Beach- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .OVERNIGHT...NE winds 5 kt. Waves flat. .SAT...SE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .SAT NIGHT...SE winds 10 to 15 kt with gusts to 20 kt...becoming NE 5 to 10 kt late. Waves 2 to 3 ft. A chance of showers. .SUN...NW winds 15 to 20 kt with gusts to 30 kt. Waves 3 ft. Showers. .SUN NIGHT...NW winds 10 to 15 kt...becoming W after midnight. Waves 1 to 2 ft. A chance of showers. .MON...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .MON NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TUE...N winds 5 to 10 kt...becoming S 10 to 15 kt. Waves 1 to 2 ft. .WED...SW winds 10 to 15 kt...becoming N 5 kt. Waves 1 to 2 ft. $$ ANZ540-182000- Eastern Bay- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .OVERNIGHT...NE winds 5 kt. Waves flat. .SAT...SE winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft. .SAT NIGHT...SE winds 10 to 15 kt with gusts to 20 kt...becoming NE 5 to 10 kt late. Waves 1 ft. A chance of showers. .SUN...NW winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers. .MON...NW winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...N winds 5 kt...becoming S 10 to 15 kt. Waves 1 ft. .WED...SW winds 10 to 15 kt...becoming N 5 kt. Waves 1 ft or less. $$ ANZ533-182000- Chesapeake Bay from North Beach to Drum Point- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .OVERNIGHT...NE winds 5 kt. Waves flat. .SAT...SE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .SAT NIGHT...SE winds 15 to 20 kt...becoming W 10 to 15 kt late. Waves 2 to 3 ft. A chance of showers. .SUN...NW winds 20 to 25 kt with gusts to 30 kt. Waves 3 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. A chance of showers. .MON...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .MON NIGHT...N winds 10 to 15 kt. Waves 2 ft. .TUE...N winds 5 to 10 kt...becoming SE 10 to 15 kt in the afternoon and evening, then becoming S after midnight. Waves 1 to 2 ft. .WED...SW winds 10 to 15 kt...becoming N 5 to 10 kt. Waves 1 to 2 ft. $$ ANZ541-182000- Choptank River to Cambridge MD and the Little Choptank River- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .OVERNIGHT...NE winds 5 kt. Waves flat. .SAT...SE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .SAT NIGHT...SE winds 10 to 15 kt...becoming SW late. Gusts up to 20 kt. Waves 1 to 2 ft. A chance of showers. .SUN...NW winds 15 to 20 kt with gusts to 30 kt. Waves 3 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. A chance of showers. .MON...NW winds 10 to 15 kt. Waves 2 ft. .MON NIGHT...N winds 10 to 15 kt. Waves 1 to 2 ft. .TUE...N winds 5 to 10 kt...becoming S 10 to 15 kt. Waves 1 to 2 ft. .WED...SW winds 10 to 15 kt...becoming N 5 kt. Waves 1 to 2 ft. $$ ANZ542-182000- Patuxent River to Broomes Island MD- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .OVERNIGHT...N winds around 5 kt. Waves 1 ft or less. .SAT...E winds 5 kt...becoming SE 10 to 15 kt with gusts to 20 kt in the afternoon. Waves 1 ft. .SAT NIGHT...SE winds 10 to 15 kt...becoming SW 5 to 10 kt late. Gusts up to 20 kt. Waves 1 ft. A chance of showers. .SUN...NW winds 15 to 20 kt with gusts to 25 kt. Waves 1 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers. .MON...NW winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...E winds 5 kt...becoming S. Waves 1 ft. .WED...W winds 5 to 10 kt...becoming N after midnight. Waves 1 ft. $$ ANZ534-182000- Chesapeake Bay from Drum Point to Smith Point- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH SUNDAY AFTERNOON... .OVERNIGHT...N winds 5 kt. Waves flat. .SAT...E winds 10 to 15 kt with gusts to 20 kt... becoming SE with gusts to 20 kt late. Waves 1 ft... building to 3 ft in the afternoon. .SAT NIGHT...SE winds 15 kt...becoming S late. Gusts up to 20 kt. Waves 3 ft. .SUN...NW winds 20 to 25 kt with gusts to 30 kt. Waves 4 ft. Showers. .SUN NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .MON...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .MON NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .TUE...N winds 5 to 10 kt...becoming S in the afternoon, then increasing to 15 to 20 kt. Waves 1 to 2 ft... building to 3 ft after midnight. .WED...SW winds 15 to 20 kt...becoming W 5 to 10 kt in the afternoon and evening, then becoming N after midnight. Waves 2 to 3 ft... subsiding to 1 ft. $$ ANZ543-182000- Tangier Sound and the inland waters surrounding Bloodsworth Island- 226 AM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH SUNDAY AFTERNOON... .OVERNIGHT...N winds 5 kt. Waves flat. .SAT...E winds 10 to 15 kt with gusts to 20 kt... becoming SE with gusts to 20 kt late. Waves 1 ft. .SAT NIGHT...SE winds 10 to 15 kt...becoming S late. Gusts up to 20 kt. Waves 2 ft. .SUN...NW winds 20 to 25 kt with gusts to 30 kt. Waves 2 to 3 ft. Showers likely. .SUN NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers likely. .MON...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .MON NIGHT...N winds 10 to 15 kt. Waves 1 ft. .TUE...N winds 5 to 10 kt...becoming SW 15 to 20 kt. Waves 1 to 2 ft. .WED...SW winds 15 to 20 kt...diminishing to 5 to 10 kt in the afternoon and evening, then becoming N after midnight. Waves 1 to 2 ft. $$