455
FZUS51 KLWX 172314
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
714 PM EDT Thu Sep 17 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.

ANZ500-180800-
714 PM EDT Thu Sep 17 2026

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

A cold front will sink southward tonight, eventually crossing the
local waters by Friday morning. High pressure briefly builds over
the northeastern U.S. on Saturday before another frontal system
looms nearby on Sunday and into early next week. Small Craft
Advisories may be needed on Friday behind the cold front. Wind gusts
 remain elevated at times Friday night through Monday, which may
prompt additional advisories.

$$

ANZ535-180800-
Tidal Potomac from Key Bridge to Indian Head-
714 PM EDT Thu Sep 17 2026

.TONIGHT...SW winds 5 kt. Waves less than 1 ft. Isolated showers and
tstms this evening, then isolated showers after midnight.
.FRI...N winds 5 kt. Waves less than 1 ft.
.FRI NIGHT...NE winds 5 kt. Waves less than 1 ft.
.SAT...E winds 5 kt. Waves less than 1 ft.
.SAT NIGHT...SE winds 5 kt. Waves less than 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN NIGHT...W winds around 5 kt. Waves 1 ft. Showers likely.
.MON...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
afternoon. Showers likely through the night.
.TUE...NE winds 10 to 15 kt. Waves 1 ft. A chance of showers in the
morning, then showers likely through the night. A chance of showers
after midnight.

Winds and waves higher and visibilities lower in and near tstms.

$$

ANZ536-180800-
Tidal Potomac from Indian Head to Cobb Island-
714 PM EDT Thu Sep 17 2026

.TONIGHT...SW winds 5 kt. Waves less than 1 ft. Isolated showers and
tstms this evening.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT...E winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN NIGHT...W winds 5 kt. Waves less than 1 ft. A chance of
showers.
.MON...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
afternoon. Showers likely through the night.
.TUE...NE winds 15 to 20 kt. Waves 1 to 2 ft. Showers likely .

Winds and waves higher and visibilities lower in and near tstms.

$$

ANZ537-180800-
Tidal Potomac from Cobb Island to Smith Point-
714 PM EDT Thu Sep 17 2026

.TONIGHT...S winds 10 kt...becoming W late. Waves 1 ft.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT...E winds 10 to 15 kt. Waves 1 to 2 ft.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 2 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.MON...NE winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers in
the afternoon. A chance of tstms through the night. Showers likely
through the night.
.TUE...NE winds 20 to 25 kt. Waves 3 ft...building to 5 ft. Showers
likely .

Winds and waves higher and visibilities lower in and near tstms.

$$

ANZ530-180800-
Chesapeake Bay north of Pooles Island-
714 PM EDT Thu Sep 17 2026

.TONIGHT...SW winds 5 kt. Waves less than 1 ft. Scattered showers
with isolated tstms this evening, then isolated showers after
midnight.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...N winds 5 to 10 kt. Waves 1 ft.
.SAT...E winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. A chance
of showers.
.SUN NIGHT...SW winds 5 to 10 kt...becoming NW after midnight. Waves
1 ft. Showers likely.
.MON...NE winds 15 to 20 kt. Waves 1 to 2 ft. A chance of showers.
.TUE...NE winds 20 to 25 kt. Waves 2 ft. A chance of showers.

Winds and waves higher and visibilities lower in and near tstms.

$$

ANZ531-180800-
Chesapeake Bay from Pooles Island to Sandy Point-
714 PM EDT Thu Sep 17 2026

.TONIGHT...S winds 10 kt...becoming W after midnight. Waves 1 ft.
Isolated showers and tstms this evening, then isolated showers after
midnight.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...NE winds 10 to 15 kt. Waves 1 to 2 ft.
.SAT...E winds 10 to 15 kt. Waves 1 to 2 ft.
.SAT NIGHT...SE winds 10 to 15 kt. Waves 1 ft.
.SUN...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance
of showers.
.SUN NIGHT...SW winds 5 to 10 kt...becoming N 10 to 15 kt after
midnight. Waves 1 to 2 ft. Showers likely.
.MON...NE winds 15 to 20 kt. Waves 2 ft. A chance of showers.
.TUE...NE winds 20 to 25 kt. Waves 3 ft. A chance of showers in the
morning, then showers likely through the night. A chance of showers
after midnight.

Winds and waves higher and visibilities lower in and near tstms.

$$

ANZ538-180800-
Patapsco River including Baltimore Harbor-
714 PM EDT Thu Sep 17 2026

.TONIGHT...SW winds 5 kt. Waves less than 1 ft. Isolated showers and
tstms this evening.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT...E winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. Showers likely.
.SUN NIGHT...SW winds 5 to 10 kt...becoming N after midnight. Waves
1 ft. Showers likely.
.MON...NE winds 10 to 15 kt. Waves 1 ft. A chance of showers.
.TUE...NE winds 15 to 20 kt. Waves 2 ft. A chance of showers in the
morning, then showers likely through the night. A chance of showers
after midnight.

Winds and waves higher and visibilities lower in and near tstms.

$$

ANZ539-180800-
Chester River to Queenstown MD-
714 PM EDT Thu Sep 17 2026

.TONIGHT...SW winds 5 to 10 kt...becoming NW late. Waves 1 ft.
Isolated showers and tstms.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT...E winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN NIGHT...SW winds 5 to 10 kt...becoming NW after midnight. Waves
1 ft. Showers likely.
.MON...NE winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers.
.TUE...NE winds 15 to 20 kt. Waves 2 ft. A chance of showers.

Winds and waves higher and visibilities lower in and near tstms.

$$

ANZ532-180800-
Chesapeake Bay from Sandy Point to North Beach-
714 PM EDT Thu Sep 17 2026

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 PM EDT THIS EVENING...

.TONIGHT...S winds 10 kt with gusts to 20 kt...becoming W after
midnight. Waves 1 to 2 ft. Isolated showers and tstms.
.FRI...N winds 5 to 10 kt. Waves 1 to 2 ft.
.FRI NIGHT...NE winds 10 to 15 kt. Waves 1 to 2 ft.
.SAT...NE winds 10 to 15 kt. Waves 1 to 2 ft.
.SAT NIGHT...SE winds 10 to 15 kt. Waves 2 ft.
.SUN...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance
of showers.
.SUN NIGHT...SW winds 10 to 15 kt...becoming NW after midnight.
Gusts up to 20 kt. Waves 1 to 2 ft. Showers likely.
.MON...NE winds 10 to 15 kt. Waves 2 ft. A chance of showers.
.TUE...NE winds 20 to 25 kt. Waves 3 ft. A chance of showers in the
morning, then showers likely through the night. A chance of showers
after midnight.

Winds and waves higher and visibilities lower in and near tstms.

$$

ANZ540-180800-
Eastern Bay-
714 PM EDT Thu Sep 17 2026

.TONIGHT...S winds 10 kt...becoming W late. Waves 1 ft. Isolated
showers and tstms this evening, then scattered showers with isolated
tstms after midnight.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 10 to 15 kt. Waves 1 ft. A chance of showers.
.SUN NIGHT...SW winds 5 to 10 kt...becoming NW after midnight. Waves
1 ft. Showers likely.
.MON...NE winds 10 to 15 kt. Waves 1 ft. A chance of showers.
.TUE...NE winds 15 to 20 kt. Waves 2 ft. A chance of showers.

Winds and waves higher and visibilities lower in and near tstms.

$$

ANZ533-180800-
Chesapeake Bay from North Beach to Drum Point-
714 PM EDT Thu Sep 17 2026

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 PM EDT THIS EVENING...

.TONIGHT...S winds 10 to 15 kt with gusts to 20 kt... becoming W
5 kt late. Waves 1 to 2 ft. Isolated showers and tstms.
.FRI...N winds 10 to 15 kt. Waves 2 ft.
.FRI NIGHT...NE winds 10 to 15 kt. Waves 2 ft.
.SAT...NE winds 10 to 15 kt. Waves 1 to 2 ft.
.SAT NIGHT...SE winds 10 to 15 kt. Waves 2 ft.
.SUN...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance
of showers.
.SUN NIGHT...S winds 10 to 15 kt...becoming NW 5 to 10 kt after
midnight. Gusts up to 20 kt. Waves 1 to 2 ft. Showers likely.
.MON...NE winds 10 to 15 kt. Waves 2 ft. A chance of showers.
.TUE...NE winds 20 to 25 kt. Waves 3 ft. A chance of showers in the
morning, then showers likely through the night. A chance of showers
after midnight.

Winds and waves higher and visibilities lower in and near tstms.

$$

ANZ541-180800-
Choptank River to Cambridge MD and the Little Choptank River-
714 PM EDT Thu Sep 17 2026

.TONIGHT...S winds 10 kt with gusts to 20 kt...becoming W late.
Waves 1 ft. Isolated showers and tstms.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT...NE winds 10 to 15 kt. Waves 1 ft.
.SAT NIGHT...SE winds 10 to 15 kt. Waves 1 ft.
.SUN...S winds 10 to 15 kt. Waves 1 ft. A chance of showers.
.SUN NIGHT...S winds 10 to 15 kt...becoming NW 5 to 10 kt after
midnight. Waves 1 ft. Showers likely.
.MON...NE winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers.
.TUE...NE winds 20 to 25 kt. Waves 2 to 3 ft. A chance of showers.

Winds and waves higher and visibilities lower in and near tstms.

$$

ANZ542-180800-
Patuxent River to Broomes Island MD-
714 PM EDT Thu Sep 17 2026

.TONIGHT...S winds 5 to 10 kt...becoming W late. Waves 1 ft.
.FRI...N winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT...E winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft.
.SUN NIGHT...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.MON...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers. Showers
likely after midnight.
.TUE...NE winds 15 to 20 kt. Waves 1 ft. Showers likely .

$$

ANZ534-180800-
Chesapeake Bay from Drum Point to Smith Point-
714 PM EDT Thu Sep 17 2026

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 PM EDT THIS EVENING...

.TONIGHT...S winds 15 kt with gusts to 20 kt...becoming W late.
Waves 1 to 2 ft.
.FRI...N winds 10 to 15 kt. Waves 1 to 2 ft.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 to 2 ft.
.SAT...E winds 10 to 15 kt. Waves 1 to 2 ft.
.SAT NIGHT...SE winds 10 to 15 kt. Waves 2 ft.
.SUN...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.SUN NIGHT...S winds 10 to 15 kt...becoming W after midnight. Gusts
up to 20 kt. Waves 2 ft. A chance of showers.
.MON...N winds 10 to 15 kt...becoming NE. Waves 1 to 2 ft. A chance
of showers.
.TUE...NE winds 20 to 25 kt. Waves 3 ft...building to 5 ft. A chance
of showers.

$$

ANZ543-180800-
Tangier Sound and the inland waters surrounding Bloodsworth Island-
714 PM EDT Thu Sep 17 2026

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 PM EDT THIS EVENING...

.TONIGHT...S winds 15 kt with gusts to 20 kt...becoming SW late.
Waves 1 to 2 ft.
.FRI...NW winds 5 to 10 kt. Waves 1 ft.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 ft.
.SAT...E winds 5 to 10 kt. Waves 1 ft.
.SAT NIGHT...SE winds 10 kt. Waves 1 ft.
.SUN...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.SUN NIGHT...S winds 10 to 15 kt...becoming SW after midnight. Gusts
up to 20 kt. Waves 1 ft. A chance of showers.
.MON...NE winds 10 to 15 kt. Waves 1 ft. A chance of showers.
.TUE...NE winds 20 to 25 kt. Waves 2 to 3 ft. A chance of showers.

$$