427
FZUS51 KLWX 220233
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
1033 PM EDT Thu Aug 21 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.

ANZ500-220800-
1033 PM EDT Thu Aug 21 2025

.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...

A frontal system which has meandered nearby has begun to pull south
of the waters this morning. The cold front exits toward the
Carolinas while Hurricane Erin remains well offshore of the Atlantic
 coast. Weak high pressure returns Friday into Saturday. A stronger
cold front approaches from the west late in the weekend before
moving through early Monday. Small Craft Advisories will likely need
 to be extended into Friday morning. Occasional gale conditions are
possible over the southern-most waters. Please see National
Hurricane Center products for the latest information on Erin.

$$

ANZ535-220800-
Tidal Potomac from Key Bridge to Indian Head-
1033 PM EDT Thu Aug 21 2025

.REST OF TONIGHT...N winds 5 kt. Waves less than 1 ft.
.FRI...NE winds 5 kt. Waves less than 1 ft.
.FRI NIGHT...SE winds around 5 kt. Waves 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...S winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 kt. Waves less than 1 ft. A chance of showers.
.SUN NIGHT...S winds around 5 kt. Waves 1 ft. A chance of showers.
.MON...NW winds 5 to 10 kt. Waves 1 ft.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ536-220800-
Tidal Potomac from Indian Head to Cobb Island-
1033 PM EDT Thu Aug 21 2025

.REST OF TONIGHT...N winds 5 to 10 kt. Waves 1 ft.
.FRI...NE winds 5 kt. Waves less than 1 ft.
.FRI NIGHT...SE winds around 5 kt. Waves 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 kt. Waves less than 1 ft. A chance of showers.
.SUN NIGHT...S winds 5 kt. Waves less than 1 ft. A chance of
showers.
.MON...NW winds 5 kt. Waves less than 1 ft.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ537-220800-
Tidal Potomac from Cobb Island to Smith Point-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 6 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 15 kt with gusts to 20 kt. Waves 2 ft.
.FRI...N winds 5 to 10 kt. Waves 1 to 2 ft.
.FRI NIGHT...SE winds 5 kt. Waves less than 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft or less.
.SAT NIGHT...S winds 5 to 10 kt. Waves 1 to 2 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.MON...NW winds 5 to 10 kt. Waves 1 ft.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ530-220800-
Chesapeake Bay north of Pooles Island-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 10 kt. Waves 1 ft.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...S winds around 5 kt. Waves flat.
.SAT...S winds 5 to 10 kt. Waves 1 ft or less.
.SAT NIGHT...S winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN NIGHT...S winds 5 to 10 kt. Waves 1 ft. Showers likely.
.MON...W winds 5 to 10 kt. Waves 1 ft or less. A chance of showers
in the morning.
.TUE...W winds 5 to 10 kt. Waves 1 ft.

$$

ANZ531-220800-
Chesapeake Bay from Pooles Island to Sandy Point-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 10 to 15 kt. Waves 1 to 2 ft.
.FRI...NE winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...SE winds 5 to 10 kt...becoming S late. Waves 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...S winds 10 to 15 kt. Waves 2 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ538-220800-
Patapsco River including Baltimore Harbor-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 5 to 10 kt. Waves 1 ft.
.FRI...NE winds 5 kt. Waves less than 1 ft.
.FRI NIGHT...S winds around 5 kt. Waves flat.
.SAT...S winds 5 to 10 kt. Waves 1 ft or less.
.SAT NIGHT...S winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.MON...W winds 5 to 10 kt. Waves 1 ft or less. A chance of showers
in the morning.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ539-220800-
Chester River to Queenstown MD-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 10 kt. Waves 1 ft.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...SE winds around 5 kt. Waves 1 ft or less.
.SAT...S winds 5 to 10 kt. Waves 1 ft or less.
.SAT NIGHT...S winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ532-220800-
Chesapeake Bay from Sandy Point to North Beach-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 15 kt with gusts to 20 kt. Waves 2 ft.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...SE winds 5 to 10 kt...becoming S late. Waves 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 to 2 ft.
.SAT NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.SUN...S winds 10 kt. Waves 1 to 2 ft. A chance of showers.
.SUN NIGHT...S winds 10 to 15 kt. Waves 2 ft. A chance of showers.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ540-220800-
Eastern Bay-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 10 kt. Waves 1 ft.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...SE winds 5 kt. Waves less than 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft or less.
.SAT NIGHT...S winds 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ533-220800-
Chesapeake Bay from North Beach to Drum Point-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 15 kt with gusts to 20 kt. Waves 2 to
3 ft.
.FRI...N winds 5 to 10 kt. Waves 1 to 2 ft.
.FRI NIGHT...E winds 5 to 10 kt...becoming S after midnight. Waves
1 ft.
.SAT...S winds 5 kt...increasing to 10 to 15 kt in the afternoon.
Waves 1 to 2 ft.
.SAT NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.SUN...S winds 10 to 15 kt. Waves 1 to 2 ft.
.SUN NIGHT...S winds 10 to 15 kt. Waves 2 ft. A chance of showers.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ541-220800-
Choptank River to Cambridge MD and the Little Choptank River-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 15 kt with gusts to 20 kt. Waves 2 ft.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...SE winds 5 kt. Waves less than 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft or less.
.SAT NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...S winds 10 to 15 kt. Waves 1 ft. A chance of showers.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ542-220800-
Patuxent River to Broomes Island MD-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 10 kt. Waves 1 ft.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...SE winds around 5 kt. Waves 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...S winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.MON...NW winds 5 kt. Waves less than 1 ft. A chance of showers in
the morning.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ534-220800-
Chesapeake Bay from Drum Point to Smith Point-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 6 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 15 to 20 kt. Gusts up to 25 kt late this
evening and early morning. Waves 3 ft.
.FRI...N winds 10 to 15 kt. Waves 2 ft.
.FRI NIGHT...E winds 5 to 10 kt...becoming SE late. Waves 1 ft.
.SAT...SE winds 5 to 10 kt. Waves 1 to 2 ft.
.SAT NIGHT...S winds 10 to 15 kt. Waves 2 ft.
.SUN...S winds 5 to 10 kt. Waves 1 to 2 ft.
.SUN NIGHT...S winds 10 to 15 kt. Waves 2 ft. A chance of showers.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ543-220800-
Tangier Sound and the inland waters surrounding Bloodsworth Island-
1033 PM EDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 6 AM EDT FRIDAY...

.REST OF TONIGHT...N winds 15 to 20 kt. Gusts up to 25 kt late this
evening and early morning. Waves 2 ft.
.FRI...N winds 10 to 15 kt. Waves 1 to 2 ft.
.FRI NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SAT...SE winds 5 to 10 kt. Waves 1 ft or less.
.SAT NIGHT...S winds 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.

$$