FZUS51 KLWX 182334
CWFLWX
Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
734 PM EDT Thu Sep 18 2025
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-
734 PM EDT Thu Sep 18 2025
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...
Weak high pressure builds over the region tonight. A cold front will
move across the waters Friday night. Small Craft Advisories for
northerly channeling are possible Friday night into Saturday
morning, and again Saturday evening for parts of the waters.
$$
ANZ535-190800-
Tidal Potomac from Key Bridge to Indian Head-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...NW winds around 5 kt. Waves 1 ft.
.FRI NIGHT...E winds around 5 kt. Waves 1 ft.
.SAT...NE winds 5 kt. Waves less than 1 ft.
.SAT NIGHT...E winds 5 kt. Waves less than 1 ft.
.SUN...E winds 5 kt. Waves less than 1 ft.
.SUN NIGHT...SE winds around 5 kt. Waves 1 ft.
.MON...S winds around 5 kt. Waves 1 ft.
.TUE...S winds around 5 kt. Waves 1 ft.
$$
ANZ536-190800-
Tidal Potomac from Indian Head to Cobb Island-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...NW winds around 5 kt. Waves 1 ft.
.FRI NIGHT...E winds around 5 kt. Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 kt. Waves less than 1 ft.
.SUN NIGHT...E winds 5 kt. Waves less than 1 ft.
.MON...S winds 5 kt. Waves less than 1 ft.
.TUE...S winds 5 kt. Waves less than 1 ft.
$$
ANZ537-190800-
Tidal Potomac from Cobb Island to Smith Point-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt...becoming W late. Waves 1 ft or
less.
.FRI...W winds around 5 kt. Waves 1 ft or less.
.FRI NIGHT...S winds around 5 kt...becoming N late. Waves flat.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 10 kt. Waves 2 ft.
.SUN...E winds 5 to 10 kt. Waves 1 to 2 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 to 2 ft.
.MON...SE winds 5 to 10 kt...becoming S after midnight. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ530-190800-
Chesapeake Bay north of Pooles Island-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves flat.
.FRI...NW winds around 5 kt. Waves flat.
.FRI NIGHT...N winds 5 to 10 kt. Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft or less.
.TUE...SW winds 5 kt. Waves less than 1 ft.
$$
ANZ531-190800-
Chesapeake Bay from Pooles Island to Sandy Point-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...N winds 5 kt. Waves flat.
.FRI NIGHT...SE winds 5 kt...becoming NE after midnight. Waves 1 ft
or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ538-190800-
Patapsco River including Baltimore Harbor-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves flat.
.FRI...NE winds 5 kt. Waves flat.
.FRI NIGHT...NE winds 5 kt...becoming 5 to 10 kt after midnight.
Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 kt. Waves less than 1 ft.
.TUE...S winds 5 kt. Waves less than 1 ft.
$$
ANZ539-190800-
Chester River to Queenstown MD-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...NW winds around 5 kt. Waves flat.
.FRI NIGHT...SE winds around 5 kt...becoming NE after midnight.
Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft or less.
.TUE...S winds 5 kt. Waves less than 1 ft.
$$
ANZ532-190800-
Chesapeake Bay from Sandy Point to North Beach-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt...becoming W late. Waves 1 ft or
less.
.FRI...N winds 5 kt. Waves less than 1 ft.
.FRI NIGHT...S winds 5 kt...becoming NE after midnight. Waves 1 ft
or less.
.SAT...NE winds 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 10 to 15 kt. Waves 1 to 2 ft.
.SUN...E winds 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ540-190800-
Eastern Bay-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...NW winds around 5 kt. Waves 1 ft or less.
.FRI NIGHT...SW winds around 5 kt...becoming NE after midnight.
Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft or less.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ533-190800-
Chesapeake Bay from North Beach to Drum Point-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt...becoming W late. Waves 1 ft or
less.
.FRI...N winds around 5 kt. Waves 1 ft or less.
.FRI NIGHT...S winds around 5 kt...becoming NE after midnight. Waves
1 ft or less.
.SAT...NE winds 10 kt. Waves 1 to 2 ft.
.SAT NIGHT...E winds 10 to 15 kt. Waves 1 to 2 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...SE winds 5 to 10 kt. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ541-190800-
Choptank River to Cambridge MD and the Little Choptank River-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt. Waves 1 ft or less.
.FRI...NW winds around 5 kt. Waves 1 ft or less.
.FRI NIGHT...SW winds around 5 kt...becoming NE after midnight.
Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ542-190800-
Patuxent River to Broomes Island MD-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...NW winds around 5 kt. Waves 1 ft.
.FRI NIGHT...E winds around 5 kt. Waves 1 ft.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...SE winds 5 kt. Waves less than 1 ft.
.TUE...S winds 5 kt. Waves less than 1 ft.
$$
ANZ534-190800-
Chesapeake Bay from Drum Point to Smith Point-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt. Waves 1 ft.
.FRI...W winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...SW winds 5 kt...becoming NE late. Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 10 to 15 kt. Waves 2 ft.
.SUN...E winds 10 kt. Waves 1 to 2 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 to 2 ft.
.MON...SE winds 5 to 10 kt...becoming S after midnight. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ543-190800-
Tangier Sound and the inland waters surrounding Bloodsworth Island-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt. Waves 1 ft or less.
.FRI...W winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...SW winds 5 kt...becoming NE late. Waves flat.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 10 to 15 kt. Waves 1 ft.
.SUN...E winds 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...E winds 5 to 10 kt...becoming S. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
CWFLWX
Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
734 PM EDT Thu Sep 18 2025
Tidal Potomac River and Maryland portion of Chesapeake Bay.
Forecasts of wave heights do not include effects of wind direction
relative to tidal currents. Expect higher waves when winds are
blowing against the tidal flow. Waves flat where waters are iced over.
ANZ500-190800-
734 PM EDT Thu Sep 18 2025
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...
Weak high pressure builds over the region tonight. A cold front will
move across the waters Friday night. Small Craft Advisories for
northerly channeling are possible Friday night into Saturday
morning, and again Saturday evening for parts of the waters.
$$
ANZ535-190800-
Tidal Potomac from Key Bridge to Indian Head-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...NW winds around 5 kt. Waves 1 ft.
.FRI NIGHT...E winds around 5 kt. Waves 1 ft.
.SAT...NE winds 5 kt. Waves less than 1 ft.
.SAT NIGHT...E winds 5 kt. Waves less than 1 ft.
.SUN...E winds 5 kt. Waves less than 1 ft.
.SUN NIGHT...SE winds around 5 kt. Waves 1 ft.
.MON...S winds around 5 kt. Waves 1 ft.
.TUE...S winds around 5 kt. Waves 1 ft.
$$
ANZ536-190800-
Tidal Potomac from Indian Head to Cobb Island-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...NW winds around 5 kt. Waves 1 ft.
.FRI NIGHT...E winds around 5 kt. Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 kt. Waves less than 1 ft.
.SUN NIGHT...E winds 5 kt. Waves less than 1 ft.
.MON...S winds 5 kt. Waves less than 1 ft.
.TUE...S winds 5 kt. Waves less than 1 ft.
$$
ANZ537-190800-
Tidal Potomac from Cobb Island to Smith Point-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt...becoming W late. Waves 1 ft or
less.
.FRI...W winds around 5 kt. Waves 1 ft or less.
.FRI NIGHT...S winds around 5 kt...becoming N late. Waves flat.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 10 kt. Waves 2 ft.
.SUN...E winds 5 to 10 kt. Waves 1 to 2 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 to 2 ft.
.MON...SE winds 5 to 10 kt...becoming S after midnight. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ530-190800-
Chesapeake Bay north of Pooles Island-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves flat.
.FRI...NW winds around 5 kt. Waves flat.
.FRI NIGHT...N winds 5 to 10 kt. Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft or less.
.TUE...SW winds 5 kt. Waves less than 1 ft.
$$
ANZ531-190800-
Chesapeake Bay from Pooles Island to Sandy Point-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...N winds 5 kt. Waves flat.
.FRI NIGHT...SE winds 5 kt...becoming NE after midnight. Waves 1 ft
or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ538-190800-
Patapsco River including Baltimore Harbor-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves flat.
.FRI...NE winds 5 kt. Waves flat.
.FRI NIGHT...NE winds 5 kt...becoming 5 to 10 kt after midnight.
Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 kt. Waves less than 1 ft.
.TUE...S winds 5 kt. Waves less than 1 ft.
$$
ANZ539-190800-
Chester River to Queenstown MD-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...NW winds around 5 kt. Waves flat.
.FRI NIGHT...SE winds around 5 kt...becoming NE after midnight.
Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft or less.
.TUE...S winds 5 kt. Waves less than 1 ft.
$$
ANZ532-190800-
Chesapeake Bay from Sandy Point to North Beach-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt...becoming W late. Waves 1 ft or
less.
.FRI...N winds 5 kt. Waves less than 1 ft.
.FRI NIGHT...S winds 5 kt...becoming NE after midnight. Waves 1 ft
or less.
.SAT...NE winds 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 10 to 15 kt. Waves 1 to 2 ft.
.SUN...E winds 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ540-190800-
Eastern Bay-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...NW winds around 5 kt. Waves 1 ft or less.
.FRI NIGHT...SW winds around 5 kt...becoming NE after midnight.
Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft or less.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ533-190800-
Chesapeake Bay from North Beach to Drum Point-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt...becoming W late. Waves 1 ft or
less.
.FRI...N winds around 5 kt. Waves 1 ft or less.
.FRI NIGHT...S winds around 5 kt...becoming NE after midnight. Waves
1 ft or less.
.SAT...NE winds 10 kt. Waves 1 to 2 ft.
.SAT NIGHT...E winds 10 to 15 kt. Waves 1 to 2 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...SE winds 5 to 10 kt. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ541-190800-
Choptank River to Cambridge MD and the Little Choptank River-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt. Waves 1 ft or less.
.FRI...NW winds around 5 kt. Waves 1 ft or less.
.FRI NIGHT...SW winds around 5 kt...becoming NE after midnight.
Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...S winds 5 to 10 kt. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ542-190800-
Patuxent River to Broomes Island MD-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 kt. Waves less than 1 ft.
.FRI...NW winds around 5 kt. Waves 1 ft.
.FRI NIGHT...E winds around 5 kt. Waves 1 ft.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...SE winds 5 kt. Waves less than 1 ft.
.TUE...S winds 5 kt. Waves less than 1 ft.
$$
ANZ534-190800-
Chesapeake Bay from Drum Point to Smith Point-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt. Waves 1 ft.
.FRI...W winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...SW winds 5 kt...becoming NE late. Waves 1 ft or less.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 10 to 15 kt. Waves 2 ft.
.SUN...E winds 10 kt. Waves 1 to 2 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 to 2 ft.
.MON...SE winds 5 to 10 kt...becoming S after midnight. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$
ANZ543-190800-
Tangier Sound and the inland waters surrounding Bloodsworth Island-
734 PM EDT Thu Sep 18 2025
.TONIGHT...SW winds 5 to 10 kt. Waves 1 ft or less.
.FRI...W winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...SW winds 5 kt...becoming NE late. Waves flat.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...E winds 10 to 15 kt. Waves 1 ft.
.SUN...E winds 10 kt. Waves 1 ft.
.SUN NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.MON...E winds 5 to 10 kt...becoming S. Waves 1 ft.
.TUE...S winds 5 to 10 kt. Waves 1 ft.
$$