646
FZUS51 KLWX 302035
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
434 PM EDT Wed Jul 30 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.

ANZ500-310800-
434 PM EDT Wed Jul 30 2025

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

A strong cold front slowly crosses the waters late tonight  through
Thursday night. Strong thunderstorms could pose a threat to
mariners Thursday afternoon into Thursday evening. Small Craft
Advisories are likely needed for most of the waters Friday
afternoon into Saturday afternoon.

$$

ANZ535-310800-
Tidal Potomac from Key Bridge to Indian Head-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...S winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds around 5 kt. Waves 1 ft.
.THU...S winds around 5 kt. Waves 1 ft. A chance of showers and
tstms. Vsby 1 NM or less.
.THU NIGHT...E winds around 5 kt. Waves 1 ft. Showers with tstms
likely.
.FRI...N winds 5 to 10 kt. Waves 1 ft. A chance of showers and
tstms.
.FRI NIGHT...N winds 5 to 10 kt. Waves 1 ft.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds around 5 kt. Waves 1 ft.

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

$$

ANZ536-310800-
Tidal Potomac from Indian Head to Cobb Island-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...SE winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds around 5 kt. Waves 1 ft.
.THU...S winds around 5 kt. Waves 1 ft. A chance of showers and
tstms. Vsby 1 NM or less.
.THU NIGHT...NE winds 5 kt. Waves less than 1 ft. Showers and tstms
likely.
.FRI...N winds 5 to 10 kt. Waves 1 ft. A chance of showers and
tstms.
.FRI NIGHT...N winds 10 kt with gusts to 20 kt. Waves 1 ft. A chance
of showers.
.SAT...NE winds 5 to 10 kt. Waves 1 ft.
.SUN...E winds around 5 kt. Waves 1 ft.

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

$$

ANZ537-310800-
Tidal Potomac from Cobb Island to Smith Point-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...SE winds 10 kt. Waves 1 ft.
.TONIGHT...S winds 5 to 10 kt. Waves 1 ft.
.THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers and
tstms. Vsby 1 NM or less.
.THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. Showers likely with a
chance of tstms.
.FRI...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Showers likely with a chance of tstms.
.FRI NIGHT...N winds 10 to 15 kt with gusts to 25 kt. Waves 2 to
3 ft. A chance of showers.
.SAT...NE winds 10 to 15 kt. Waves 2 to 3 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.

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

$$

ANZ530-310800-
Chesapeake Bay north of Pooles Island-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...SW winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 5 kt. Waves flat.
.THU...S winds 5 kt. Waves less than 1 ft. Showers and tstms likely.
Vsby 1 NM or less.
.THU NIGHT...NE winds 5 to 10 kt. Waves 1 ft. Showers with tstms
likely.
.FRI...N winds 10 to 15 kt. Waves 1 ft. A chance of showers and
tstms.
.FRI NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.SAT...NE winds 10 to 15 kt...diminishing to around 5 kt after
midnight. Waves 1 ft or less.
.SUN...E winds around 5 kt. Waves flat.

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

$$

ANZ531-310800-
Chesapeake Bay from Pooles Island to Sandy Point-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...S winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 5 to 10 kt. Waves 1 ft.
.THU...S winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.
Vsby 1 NM or less.
.THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. Showers with tstms
likely.
.FRI...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A
chance of showers and tstms.
.FRI NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A
chance of showers.
.SAT...NE winds 10 to 15 kt...becoming E 5 kt after midnight. Waves
1 to 2 ft.
.SUN...E winds 5 kt. Waves less than 1 ft.

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

$$

ANZ538-310800-
Patapsco River including Baltimore Harbor-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...S winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds around 5 kt. Waves 1 ft or less.
.THU...S winds around 5 kt. Waves 1 ft or less. Showers and tstms
likely. Vsby 1 NM or less.
.THU NIGHT...E winds 5 kt. Waves less than 1 ft. Showers with tstms
likely.
.FRI...N winds 10 to 15 kt. Waves 1 ft. A chance of showers and
tstms.
.FRI NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.SAT...NE winds 5 to 10 kt. Waves 1 ft or less.
.SUN...E winds around 5 kt. Waves 1 ft or less.

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

$$

ANZ539-310800-
Chester River to Queenstown MD-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...S winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 5 kt. Waves less than 1 ft.
.THU...S winds 5 kt. Waves less than 1 ft. Showers and tstms likely.
Vsby 1 NM or less.
.THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. Showers with tstms
likely.
.FRI...N winds 10 to 15 kt. Waves 1 ft. A chance of showers and
tstms.
.FRI NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A
chance of showers.
.SAT...NE winds 10 to 15 kt...becoming E 5 to 10 kt. Waves 1 to
2 ft...subsiding to flat after midnight.
.SUN...E winds 5 kt. Waves less than 1 ft.

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

$$

ANZ532-310800-
Chesapeake Bay from Sandy Point to North Beach-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft.
.TONIGHT...S winds 5 to 10 kt. Waves 1 ft.
.THU...S winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.
Vsby 1 NM or less.
.THU NIGHT...SE winds 5 to 10 kt. Waves 1 ft. Showers with tstms
likely.
.FRI...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A
chance of showers and tstms.
.FRI NIGHT...NE winds 15 to 20 kt. Waves 2 ft. A chance of showers.
.SAT...NE winds 10 to 15 kt...becoming E 5 to 10 kt after midnight.
Waves 1 to 2 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.

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

$$

ANZ540-310800-
Eastern Bay-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...S winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 5 to 10 kt. Waves 1 ft.
.THU...S winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.
Vsby 1 NM or less.
.THU NIGHT...SE winds 5 to 10 kt. Waves 1 ft. Showers with tstms
likely.
.FRI...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A chance
of showers and tstms.
.FRI NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 to
2 ft. A chance of showers.
.SAT...NE winds 10 to 15 kt...becoming E 5 kt after midnight. Waves
1 to 2 ft.
.SUN...E winds 5 kt. Waves less than 1 ft.

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

$$

ANZ533-310800-
Chesapeake Bay from North Beach to Drum Point-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft.
.TONIGHT...S winds 5 to 10 kt. Waves 1 ft.
.THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers and
tstms. Vsby 1 NM or less.
.THU NIGHT...SE winds 5 to 10 kt. Waves 1 ft. Showers with tstms
likely.
.FRI...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A
chance of showers and tstms.
.FRI NIGHT...N winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. A
chance of showers.
.SAT...NE winds 10 to 15 kt...becoming E 5 to 10 kt after midnight.
Waves 2 to 3 ft...subsiding to 1 ft after midnight.
.SUN...E winds 5 to 10 kt. Waves 1 ft.

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

$$

ANZ541-310800-
Choptank River to Cambridge MD and the Little Choptank River-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...S winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 5 to 10 kt. Waves 1 ft.
.THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers and
tstms. Vsby 1 NM or less.
.THU NIGHT...SE winds 5 to 10 kt. Waves 1 ft. Showers with a chance
of tstms.
.FRI...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A chance
of showers and tstms.
.FRI NIGHT...N winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft. A
chance of showers.
.SAT...NE winds 10 to 15 kt...becoming E 5 kt after midnight. Waves
1 to 2 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.

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

$$

ANZ542-310800-
Patuxent River to Broomes Island MD-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...SE winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 5 to 10 kt. Waves 1 ft.
.THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers and
tstms. Vsby 1 NM or less.
.THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. Showers with a chance
of tstms.
.FRI...N winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Waves 1 ft. A chance of showers and tstms.
.FRI NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A
chance of showers.
.SAT...NE winds 10 to 15 kt...diminishing to 5 kt after midnight.
Waves 1 ft.
.SUN...E winds 5 to 10 kt. Waves 1 ft.

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

$$

ANZ534-310800-
Chesapeake Bay from Drum Point to Smith Point-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft.
.TONIGHT...S winds 5 to 10 kt. Waves 2 ft.
.THU...S winds 5 to 10 kt. Waves 1 to 2 ft. A chance of showers and
tstms. Vsby 1 NM or less.
.THU NIGHT...S winds 10 kt. Waves 1 to 2 ft. Showers likely with a
chance of tstms.
.FRI...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Showers likely with a chance of tstms.
.FRI NIGHT...N winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. A
chance of showers.
.SAT...NE winds 15 to 20 kt...diminishing to 10 kt after midnight.
Waves 2 to 3 ft.
.SUN...E winds 5 to 10 kt. Waves 1 to 2 ft.

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

$$

ANZ543-310800-
Tangier Sound and the inland waters surrounding Bloodsworth Island-
434 PM EDT Wed Jul 30 2025

.REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft.
.TONIGHT...S winds 5 to 10 kt. Waves 1 ft.
.THU...S winds 5 to 10 kt. Waves 1 ft.
.THU NIGHT...S winds 5 to 10 kt. Waves 1 ft. Showers likely with a
chance of tstms.
.FRI...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers
likely with a chance of tstms.
.FRI NIGHT...N winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. A
chance of showers.
.SAT...NE winds 15 to 20 kt...diminishing to 5 to 10 kt after
midnight. Waves 1 to 2 ft.
.SUN...NE winds 5 to 10 kt. Waves 1 ft.

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

$$