729
FZUS51 KLWX 122059
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
459 PM EDT Tue May 12 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.

ANZ500-130800-
459 PM EDT Tue May 12 2026

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

High pressure will build in from the west through tonight before
another frontal system approaches Wednesday into Wednesday night.
High pressure will return Friday. Small Craft Advisories may be
needed at times Wednesday night through Friday.

$$

ANZ535-130800-
Tidal Potomac from Key Bridge to Indian Head-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 AM EDT WEDNESDAY THROUGH
WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...S winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the late
evening and overnight. Waves 1 ft.
.WED...S winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft. A chance
of showers.
.WED NIGHT...S winds 5 to 10 kt...becoming W after midnight. Gusts
up to 20 kt. Waves 1 ft. Showers.
.THU...NW winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
.THU NIGHT...NW winds 10 to 15 kt. Gusts up to 25 kt in the evening.
Waves 1 ft.
.FRI...NW winds 5 to 10 kt...becoming light. Waves 1 ft.
.SAT...SW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ536-130800-
Tidal Potomac from Indian Head to Cobb Island-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 AM EDT WEDNESDAY THROUGH
WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...SE winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.WED...SW winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft.
.WED NIGHT...S winds 5 to 10 kt...becoming W after midnight. Gusts
up to 20 kt. Waves 1 ft. Showers.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.FRI...NW winds 10 to 15 kt...becoming SW around 5 kt. Waves 1 ft or
less.
.SAT...SW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ537-130800-
Tidal Potomac from Cobb Island to Smith Point-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 AM EDT WEDNESDAY THROUGH
WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...SE winds 10 kt. Waves 1 ft.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt. Waves 1 to 2 ft.
.WED...S winds 15 to 20 kt with gusts to 25 kt. Waves 2 to 3 ft.
.WED NIGHT...S winds 15 to 20 kt with gusts to 25 kt...becoming SW
5 to 10 kt after midnight. Waves 2 to 3 ft. Showers likely.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
.THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.FRI...NW winds 10 to 15 kt...becoming SW around 5 kt. Waves 1 to
2 ft...subsiding to flat after midnight.
.SAT...SW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ530-130800-
Chesapeake Bay north of Pooles Island-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 AM EDT WEDNESDAY THROUGH
WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...S winds 5 kt. Waves flat.
.TONIGHT...S winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
.WED...S winds 15 to 20 kt with gusts to 30 kt. Waves 2 ft. A chance
of showers.
.WED NIGHT...S winds 10 to 15 kt with gusts to 25 kt...becoming SW
5 to 10 kt after midnight. Waves 1 to 2 ft. Showers.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.FRI...NW winds 10 to 15 kt...becoming W around 5 kt. Waves 1 ft or
less.
.SAT...SW winds 5 to 10 kt. Waves 1 ft or less.

$$

ANZ531-130800-
Chesapeake Bay from Pooles Island to Sandy Point-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM EDT THIS EVENING
THROUGH WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...SE winds 10 kt. Waves 1 ft.
.TONIGHT...S winds 15 to 20 kt with gusts to 25 kt. Waves 1 ft...
building to 3 ft after midnight.
.WED...S winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. A chance
of showers.
.WED NIGHT...S winds 15 to 20 kt with gusts to 25 kt...becoming W
5 to 10 kt after midnight. Waves 2 to 3 ft. Showers.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
.THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.FRI...NW winds 10 to 15 kt...becoming W around 5 kt. Waves 1 to
2 ft...subsiding to flat after midnight.
.SAT...SW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ538-130800-
Patapsco River including Baltimore Harbor-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 AM EDT WEDNESDAY THROUGH
WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...SE winds 10 kt. Waves 1 ft.
.TONIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.WED...S winds 10 to 15 kt with gusts to 25 kt. Waves 1 to 2 ft. A
chance of showers.
.WED NIGHT...S winds 10 to 15 kt with gusts to 20 kt...becoming W
5 kt after midnight. Waves 1 ft. Showers.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.FRI...NW winds 5 to 10 kt...becoming light. Waves 1 ft or less.
.SAT...SW winds 5 to 10 kt. Waves 1 ft or less.

$$

ANZ539-130800-
Chester River to Queenstown MD-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 AM EDT WEDNESDAY THROUGH
WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...S winds 5 kt. Waves flat.
.TONIGHT...S winds 10 to 15 kt with gusts to 25 kt. Waves 1 to 2 ft.
.WED...S winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. A chance
of showers.
.WED NIGHT...S winds 10 to 15 kt with gusts to 25 kt...becoming SW
5 to 10 kt after midnight. Waves 1 to 2 ft. Showers.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
.THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.FRI...NW winds 15 kt...becoming W 5 to 10 kt. Waves 1 to 2 ft...
subsiding to flat after midnight.
.SAT...SW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ532-130800-
Chesapeake Bay from Sandy Point to North Beach-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM EDT THIS EVENING
THROUGH WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...SE winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 15 to 20 kt with gusts to 25 kt. Waves 2 to 3 ft.
.WED...S winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. A chance
of showers.
.WED NIGHT...S winds 15 to 20 kt with gusts to 25 kt...becoming W
5 to 10 kt after midnight. Waves 2 to 3 ft. Showers.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
.THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.FRI...NW winds 10 to 15 kt...becoming SW 5 kt. Waves 1 to 2 ft...
subsiding to flat after midnight.
.SAT...SW winds 5 to 10 kt. Waves 1 to 2 ft.

$$

ANZ540-130800-
Eastern Bay-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM EDT THIS EVENING
THROUGH WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...S winds 5 kt. Waves flat.
.TONIGHT...S winds 10 to 15 kt with gusts to 25 kt. Waves 1 to 2 ft.
.WED...S winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft.
.WED NIGHT...S winds 15 to 20 kt with gusts to 25 kt...becoming SW
5 to 10 kt after midnight. Waves 1 to 2 ft. Showers likely.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to
2 ft.
.FRI...NW winds 10 to 15 kt...becoming SW around 5 kt. Waves 1 to
2 ft...subsiding to flat after midnight.
.SAT...SW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ533-130800-
Chesapeake Bay from North Beach to Drum Point-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM EDT THIS EVENING
THROUGH WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...SE winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 15 to 20 kt with gusts to 25 kt. Waves 2 to 3 ft.
.WED...S winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft.
.WED NIGHT...S winds 15 to 20 kt with gusts to 25 kt...becoming SW
5 to 10 kt after midnight. Waves 2 to 3 ft. Showers likely.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.FRI...NW winds 15 to 20 kt...becoming SW around 5 kt. Waves 1 to
2 ft...subsiding to flat after midnight.
.SAT...SW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ541-130800-
Choptank River to Cambridge MD and the Little Choptank River-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM EDT THIS EVENING
THROUGH WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...S winds 5 kt. Waves flat.
.TONIGHT...S winds 15 to 20 kt with gusts to 25 kt. Waves 1 to 2 ft.
.WED...S winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft.
.WED NIGHT...S winds 15 to 20 kt with gusts to 25 kt...becoming SW
5 to 10 kt after midnight. Waves 1 to 2 ft. Showers likely.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.FRI...NW winds 10 to 15 kt...becoming SW around 5 kt. Waves 1 to
2 ft...subsiding to flat after midnight.
.SAT...SW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ542-130800-
Patuxent River to Broomes Island MD-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 AM EDT WEDNESDAY THROUGH
WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...SE winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt. Waves 1 ft.
.WED...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.WED NIGHT...S winds 10 to 15 kt...becoming W 5 to 10 kt after
midnight. Gusts up to 20 kt. Waves 1 ft. Showers likely.
.THU...NW winds 5 to 10 kt. Waves 1 ft.
.THU NIGHT...NW winds 10 kt. Waves 1 ft.
.FRI...NW winds 10 to 15 kt...becoming SW around 5 kt. Waves 1 ft.
.SAT...SW winds 5 to 10 kt. Waves 1 ft.

$$

ANZ534-130800-
Chesapeake Bay from Drum Point to Smith Point-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM EDT THIS EVENING
THROUGH WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...SE winds 5 kt. Waves flat.
.TONIGHT...S winds 15 to 20 kt. Gusts up to 25 kt late. Waves 2 to
3 ft.
.WED...S winds 15 to 20 kt...becoming 20 kt late. Gusts up to
25 kt...increasing to 30 kt late. Waves 3 ft.
.WED NIGHT...S winds 20 to 25 kt with gusts to 30 kt...becoming SW
10 to 15 kt with gusts to 20 kt after midnight. Waves 3 ft. Showers.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.THU NIGHT...NW winds 15 to 20 kt. Waves 3 ft.
.FRI...NW winds 15 to 20 kt...becoming SW around 5 kt. Waves 2 to
3 ft...subsiding to 1 ft.
.SAT...SW winds 5 to 10 kt. Waves 1 to 2 ft.

$$

ANZ543-130800-
Tangier Sound and the inland waters surrounding Bloodsworth Island-
459 PM EDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM EDT THIS EVENING
THROUGH WEDNESDAY AFTERNOON...

.REST OF THIS AFTERNOON...SW winds 5 kt. Waves flat.
.TONIGHT...S winds 15 to 20 kt with gusts to 25 kt. Waves 1 to 2 ft.
.WED...S winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft.
.WED NIGHT...S winds 15 to 20 kt with gusts to 30 kt...becoming SW
10 to 15 kt with gusts to 20 kt after midnight. Waves 2 to 3 ft.
Showers.
.THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.THU NIGHT...NW winds 15 to 20 kt. Waves 2 ft.
.FRI...NW winds 15 to 20 kt...becoming SW around 5 kt. Waves 1 to
2 ft.
.SAT...SW winds 10 to 15 kt. Waves 1 ft.

$$