FZUS51 KLWX 181604 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 1204 PM 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. ANZ500-190800- 1204 PM EDT Sat Apr 18 2026 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... A cold front approaching the Appalachians will cross the Mid- Atlantic tonight, then move offshore Sunday morning. A secondary cold front will follow in its wake Sunday night into Monday morning. High pressure will build in behind these fronts late Monday through Tuesday. Another front looks to drop in from the north Wednesday. Small Craft Advisories may be needed Monday morning through Monday evening in northwest flow, and late Tuesday into Wednesday in south to southwest flow. $$ ANZ535-190800- Tidal Potomac from Key Bridge to Indian Head- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft. .TONIGHT...SE winds 10 to 15 kt with gusts to 25 kt... diminishing to 5 kt after midnight, then becoming N late. Waves 1 ft. Scattered showers. .SUN...NW winds 15 to 20 kt with gusts to 30 kt... diminishing to 10 kt with gusts to 20 kt late. Waves 1 to 2 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft. .MON...NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...SW winds around 5 kt. Waves 1 ft. .WED...W winds around 5 kt. Waves 1 ft. A chance of showers through the night. $$ ANZ536-190800- Tidal Potomac from Indian Head to Cobb Island- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TONIGHT...SE winds 10 to 15 kt...becoming W 5 to 10 kt late. Gusts up to 20 kt. Waves 1 to 2 ft. Scattered showers. .SUN...NW winds 20 to 25 kt...diminishing to 10 to 15 kt in the afternoon. Gusts up to 30 kt...diminishing to 20 kt late. Waves 2 to 3 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. 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...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. $$ ANZ537-190800- Tidal Potomac from Cobb Island to Smith Point- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 15 kt with gusts to 20 kt. Waves 2 ft. .TONIGHT...SE winds 15 to 20 kt...becoming SW 10 to 15 kt late. Waves 2 ft. .SUN...NW winds 15 to 20 kt. Gusts up to 30 kt in the late morning and early afternoon...diminishing to 20 kt. Waves 3 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. .MON...NW winds 10 to 15 kt. Waves 1 to 2 ft. .MON NIGHT...N winds 10 to 15 kt. Waves 1 to 2 ft. .TUE...N winds 5 to 10 kt...becoming SE 10 to 15 kt in the afternoon and evening, then becoming S after midnight. Waves 1 to 2 ft. .WED...SW winds 10 to 15 kt...becoming NW 5 kt. Waves 1 to 2 ft. $$ ANZ530-190800- Chesapeake Bay north of Pooles Island- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 10 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...SE winds 10 to 15 kt with gusts to 20 kt... becoming NE 5 to 10 kt late. Waves 1 ft. Scattered showers. .SUN...NW winds 15 to 20 kt with gusts to 25 kt... diminishing to 10 kt with gusts to 20 kt late. Waves 2 ft. Showers. .SUN NIGHT...W winds 5 to 10 kt. 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...W winds around 5 kt...becoming S. Waves 1 ft. .WED...SW winds 5 to 10 kt...becoming N. Waves 1 ft. $$ ANZ531-190800- Chesapeake Bay from Pooles Island to Sandy Point- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TONIGHT...SE winds 10 to 15 kt with gusts to 20 kt... becoming NE 5 to 10 kt late. Waves 1 to 2 ft. Scattered showers. .SUN...NW winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. Showers. .SUN NIGHT...NW winds 10 to 15 kt...becoming W 5 to 10 kt after midnight. Waves 1 to 2 ft. .MON...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .MON NIGHT...N winds 10 to 15 kt. Waves 1 to 2 ft. .TUE...N winds 5 kt...becoming S 10 to 15 kt. Waves 1 to 2 ft. .WED...SW winds 10 to 15 kt...becoming N 5 kt. Waves 1 to 2 ft. $$ ANZ538-190800- Patapsco River including Baltimore Harbor- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 10 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...SE winds 10 to 15 kt with gusts to 20 kt... becoming NE 5 kt after midnight. Waves 1 ft. Scattered 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. .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. $$ ANZ539-190800- Chester River to Queenstown MD- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 10 kt. Waves 1 ft. .TONIGHT...SE winds 5 to 10 kt...becoming NE late. Waves 1 ft. Scattered showers. .SUN...NW winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. .MON...NW winds 5 to 10 kt. Waves 2 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 to 2 ft. .TUE...W winds 5 kt...becoming S 10 to 15 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt...becoming N. Waves 1 ft or less. $$ ANZ532-190800- Chesapeake Bay from Sandy Point to North Beach- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TONIGHT...SE winds 10 to 15 kt with gusts to 20 kt... becoming NE 5 to 10 kt late. Waves 2 to 3 ft. Scattered 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. .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.$$ ANZ540-190800- Eastern Bay- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 10 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...SE winds 10 to 15 kt with gusts to 20 kt... becoming NE 5 to 10 kt late. Waves 1 ft. Scattered showers. .SUN...NW winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...NW winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...N winds 5 kt...becoming S 10 to 15 kt. Waves 1 to 2 ft. .WED...SW winds 10 to 15 kt...becoming N 5 kt. Waves 1 to 2 ft... subsiding to flat after midnight. $$ ANZ533-190800- Chesapeake Bay from North Beach to Drum Point- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TONIGHT...SE winds 15 to 20 kt...becoming W 10 to 15 kt late. Waves 2 to 3 ft. Scattered showers. .SUN...NW winds 20 to 25 kt with gusts to 30 kt... diminishing to 10 to 15 kt with gusts to 20 kt late. Waves 3 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. .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. $$ ANZ541-190800- Choptank River to Cambridge MD and the Little Choptank River- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...SE winds 10 to 15 kt...becoming SW late. Gusts up to 20 kt. Waves 1 to 2 ft. Scattered showers. .SUN...NW winds 15 to 20 kt with gusts to 30 kt. Waves 3 ft. Showers. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. .MON...NW winds 10 to 15 kt. Waves 2 ft. .MON NIGHT...N winds 10 to 15 kt. Waves 1 to 2 ft. .TUE...N winds 5 to 10 kt...becoming S 10 to 15 kt. Waves 1 to 2 ft. .WED...SW winds 10 to 15 kt...becoming N 5 kt. Waves 1 to 2 ft. $$ ANZ542-190800- Patuxent River to Broomes Island MD- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 15 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...SE winds 10 to 15 kt...becoming SW 5 to 10 kt late. Gusts up to 20 kt. Waves 1 ft. Scattered 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. .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. $$ ANZ534-190800- Chesapeake Bay from Drum Point to Smith Point- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 15 kt with gusts to 20 kt. Waves 2 to 3 ft. .TONIGHT...SE winds 15 kt...becoming S late. Gusts up to 20 kt. Waves 3 ft. .SUN...NW winds 20 to 25 kt. Gusts up to 30 kt. Waves 4 ft. Showers. .SUN NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .MON...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .MON NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .TUE...N winds 5 to 10 kt...becoming S in the afternoon, then increasing to 15 to 20 kt. Waves 1 to 2 ft... building to 3 ft after midnight. .WED...SW winds 15 to 20 kt...becoming W 5 to 10 kt in the afternoon and evening, then becoming N after midnight. Waves 2 to 3 ft... subsiding to 1 ft. $$ ANZ543-190800- Tangier Sound and the inland waters surrounding Bloodsworth Island- 1204 PM EDT Sat Apr 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SUNDAY AFTERNOON... .THIS AFTERNOON...SE winds 15 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...SE winds 10 to 15 kt...becoming S late. Gusts up to 20 kt. Waves 2 ft. .SUN...W winds 15 to 20 kt...becoming NW 20 to 25 kt in the late morning and afternoon. Gusts up to 30 kt. Waves 2 to 3 ft. Numerous showers. .SUN NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .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. $$