581
FZUS51 KLWX 200554
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
154 AM EDT Wed Aug 20 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.

ANZ500-202000-
154 AM EDT Wed Aug 20 2025

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

A stalled frontal boundary will remain near the Virginia/North
Carolina border through tonight. This frontal system meanders nearby
 through mid-week before. This system eventually moves away to the
southeast as a cold front by Thursday as Hurricane Erin passes well
offshore. Weak high pressure returns Friday into Saturday. Small
Craft Advisories will likely be needed late Wednesday into Friday.
Please see National Hurricane Center products for the latest
information on Erin.

$$

ANZ535-202000-
Tidal Potomac from Key Bridge to Indian Head-
154 AM EDT Wed Aug 20 2025

.OVERNIGHT...NE winds 5 kt. Waves less than 1 ft. Patchy drizzle.
Patchy fog.
.WED...E winds around 5 kt. Waves 1 ft. Patchy drizzle. Patchy fog.
.WED NIGHT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.THU...NE winds 10 kt with gusts to 20 kt. Waves 1 ft. A chance of
showers.
.THU NIGHT...N winds 5 to 10 kt with gusts to 20 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.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of tstms through the
night. A chance of showers.

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

$$

ANZ536-202000-
Tidal Potomac from Indian Head to Cobb Island-
154 AM EDT Wed Aug 20 2025

.OVERNIGHT...E winds 5 kt. Waves less than 1 ft. Isolated showers
with patchy drizzle. Patchy fog.
.WED...E winds around 5 kt. Waves 1 ft. Patchy fog.
.WED NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.THU...NE winds 10 to 15 kt with gusts to 25 kt. Waves 1 to 2 ft. A
chance of showers.
.THU NIGHT...N winds 10 to 15 kt. Gusts up to 25 kt in the evening.
Waves 1 to 2 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.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

$$

ANZ537-202000-
Tidal Potomac from Cobb Island to Smith Point-
154 AM EDT Wed Aug 20 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT EARLY THIS
MORNING...

.OVERNIGHT...E winds 10 kt. Waves 1 to 2 ft. Isolated showers with
patchy drizzle. Patchy fog.
.WED...SE winds 5 to 10 kt. Waves 1 ft. Patchy fog.
.WED NIGHT...E winds 10 to 15 kt with gusts to 20 kt...becoming NE
15 to 20 kt with gusts to 25 kt after midnight. Waves 2 to 3 ft.
.THU...NE winds 15 to 20 kt with gusts to 30 kt. Waves 4 ft. A
chance of showers.
.THU NIGHT...N winds 15 to 20 kt with gusts to 30 kt. Waves 3 ft.
.FRI...N winds 10 to 15 kt with gusts to 25 kt. Waves 2 to 3 ft.
.FRI NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

$$

ANZ530-202000-
Chesapeake Bay north of Pooles Island-
154 AM EDT Wed Aug 20 2025

.OVERNIGHT...E winds 10 kt. Waves 1 ft. Areas of drizzle.
.WED...E winds 5 to 10 kt. Waves 1 ft. A chance of showers and
tstms. Patchy fog. Vsby 1 NM or less.
.WED NIGHT...E winds 10 to 15 kt...becoming NE after midnight. Gusts
up to 20 kt. Waves 1 to 2 ft. A chance of showers and tstms.
.THU...NE winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft.
.THU NIGHT...N winds 10 to 15 kt with gusts to 25 kt. Waves 1 to
2 ft.
.FRI...N winds 10 to 15 kt with gusts to 20 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.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
afternoon. Showers likely with a chance of tstms through the night.

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

$$

ANZ531-202000-
Chesapeake Bay from Pooles Island to Sandy Point-
154 AM EDT Wed Aug 20 2025

.OVERNIGHT...E winds 10 kt. Waves 1 ft. Patchy drizzle. Patchy fog.
.WED...E winds 5 to 10 kt. Waves 1 ft. A chance of showers, tstms
with patchy drizzle. Patchy fog. Vsby 1 NM or less.
.WED NIGHT...E winds 10 to 15 kt...becoming NE after midnight. Gusts
up to 20 kt. Waves 1 to 2 ft. A chance of showers and tstms. Vsby
1 NM or less.
.THU...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 to 3 ft.
.THU NIGHT...N winds 15 to 20 kt with gusts to 25 kt. Waves 2 to
3 ft.
.FRI...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
.FRI NIGHT...SE winds 5 kt. Waves less than 1 ft.
.SAT...S winds 10 to 15 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
afternoon. Showers likely through the night.

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

$$

ANZ538-202000-
Patapsco River including Baltimore Harbor-
154 AM EDT Wed Aug 20 2025

.OVERNIGHT...E winds 5 kt. Waves less than 1 ft. Patchy drizzle.
Patchy fog.
.WED...E winds 5 to 10 kt. Waves 1 ft. A chance of showers and
tstms. Patchy fog.
.WED NIGHT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers and
tstms. Vsby 1 NM or less.
.THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.THU NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
.FRI...NE winds 5 to 10 kt with gusts to 20 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.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
afternoon. Showers likely through the night.

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

$$

ANZ539-202000-
Chester River to Queenstown MD-
154 AM EDT Wed Aug 20 2025

.OVERNIGHT...E winds 10 kt. Waves 1 ft. Patchy drizzle. Patchy fog.
.WED...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers and
tstms. Patchy fog. Vsby 1 NM or less.
.WED NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt. Waves 1 ft. A
chance of showers and tstms. Vsby 1 NM or less.
.THU...NE winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft.
.THU NIGHT...N winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft.
.FRI...N winds 10 to 15 kt with gusts to 20 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.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
afternoon. Showers likely through the night.

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

$$

ANZ532-202000-
Chesapeake Bay from Sandy Point to North Beach-
154 AM EDT Wed Aug 20 2025

.OVERNIGHT...E winds 10 kt. Waves 1 ft. Patchy drizzle. Patchy fog.
.WED...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers with
areas of drizzle. Patchy fog.
.WED NIGHT...E winds 10 to 15 kt with gusts to 20 kt...becoming NE
with gusts to 25 kt after midnight. Waves 2 ft. A chance of showers.
.THU...NE winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. A
chance of showers.
.THU NIGHT...N winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft.
.FRI...N winds 10 to 15 kt. Gusts up to 25 kt in the morning. Waves
2 to 3 ft.
.FRI NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SAT...S winds 10 to 15 kt. Waves 1 to 2 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

$$

ANZ540-202000-
Eastern Bay-
154 AM EDT Wed Aug 20 2025

.OVERNIGHT...E winds 10 kt. Waves 1 ft. Patchy drizzle. Patchy fog.
.WED...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers, tstms
with areas of drizzle. Patchy fog. Vsby 1 NM or less.
.WED NIGHT...E winds 10 to 15 kt...becoming NE late. Gusts up to
20 kt. Waves 1 to 2 ft. A chance of showers and tstms.
.THU...NE winds 15 kt with gusts to 25 kt. Waves 2 ft. A chance of
showers.
.THU NIGHT...N winds 15 kt with gusts to 25 kt. Waves 2 ft.
.FRI...N winds 10 to 15 kt with gusts to 20 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.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
afternoon. Showers likely through the night.

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

$$

ANZ533-202000-
Chesapeake Bay from North Beach to Drum Point-
154 AM EDT Wed Aug 20 2025

.OVERNIGHT...E winds 10 kt. Waves 1 ft. Patchy drizzle. Patchy fog.
.WED...SE winds 5 to 10 kt. Waves 1 ft. Patchy fog.
.WED NIGHT...E winds 10 to 15 kt with gusts to 20 kt...becoming NE
15 to 20 kt with gusts to 25 kt after midnight. Waves 2 to 3 ft. A
chance of showers.
.THU...NE winds 15 to 20 kt with gusts to 30 kt. Waves 3 ft. A
chance of showers.
.THU NIGHT...N winds 15 to 20 kt with gusts to 30 kt. Waves 4 ft.
.FRI...N winds 10 to 15 kt. Gusts up to 25 kt in the morning. Waves
2 to 3 ft.
.FRI NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SAT...S winds 10 to 15 kt. Waves 1 to 2 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

$$

ANZ541-202000-
Choptank River to Cambridge MD and the Little Choptank River-
154 AM EDT Wed Aug 20 2025

.OVERNIGHT...E winds 10 kt. Waves 1 ft. Patchy drizzle. Patchy fog.
.WED...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers. Patchy
fog.
.WED NIGHT...E winds 10 to 15 kt with gusts to 20 kt...becoming NE
15 to 20 kt with gusts to 25 kt after midnight. Waves 1 to 2 ft. A
chance of showers.
.THU...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. A
chance of showers.
.THU NIGHT...N winds 15 to 20 kt with gusts to 30 kt. Waves 2 ft.
.FRI...N winds 10 to 15 kt. Gusts up to 25 kt in the morning. Waves
1 to 2 ft.
.FRI NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SAT...S winds 10 to 15 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

$$

ANZ542-202000-
Patuxent River to Broomes Island MD-
154 AM EDT Wed Aug 20 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT EARLY THIS
MORNING...

.OVERNIGHT...E winds 5 kt. Waves less than 1 ft. Patchy drizzle.
Patchy fog.
.WED...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers. Patchy
fog.
.WED NIGHT...E winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
.THU...NE winds 15 to 20 kt with gusts to 25 kt. Waves 1 ft. A
chance of showers.
.THU NIGHT...N winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
.FRI...N winds 10 to 15 kt. Gusts up to 25 kt in the morning. Waves
1 ft.
.FRI NIGHT...SE winds 5 to 10 kt. Waves 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

$$

ANZ534-202000-
Chesapeake Bay from Drum Point to Smith Point-
154 AM EDT Wed Aug 20 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT EARLY THIS
MORNING...

.OVERNIGHT...E winds 10 kt. Waves 2 ft. Isolated showers with patchy
drizzle. Patchy fog.
.WED...SE winds 5 to 10 kt. Waves 1 ft. Patchy fog.
.WED NIGHT...E winds 10 to 15 kt...becoming NE 15 to 20 kt after
midnight. Gusts up to 25 kt. Waves 2 to 3 ft. A chance of showers.
.THU...NE winds 20 to 25 kt with gusts to 30 kt. Waves 4 ft. A
chance of showers.
.THU NIGHT...N winds 20 to 25 kt with gusts to 30 kt. Waves 4 ft.
.FRI...N winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft.
.FRI NIGHT...E winds 5 to 10 kt. Waves 1 to 2 ft.
.SAT...S winds 10 to 15 kt. Waves 1 to 2 ft.
.SUN...S winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers.

$$

ANZ543-202000-
Tangier Sound and the inland waters surrounding Bloodsworth Island-
154 AM EDT Wed Aug 20 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT EARLY THIS
MORNING...

.OVERNIGHT...E winds 10 kt. Waves 1 ft. Isolated showers with patchy
drizzle. Patchy fog.
.WED...SE winds 5 to 10 kt. Waves 1 ft. Patchy fog.
.WED NIGHT...E winds 10 to 15 kt...becoming NE 15 to 20 kt after
midnight. Gusts up to 25 kt. Waves 2 ft.
.THU...NE winds 20 to 25 kt with gusts to 30 kt. Waves 3 ft. A
chance of showers.
.THU NIGHT...N winds 20 to 25 kt with gusts to 30 kt. Waves 3 ft.
.FRI...N winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft.
.FRI NIGHT...E winds 5 to 10 kt. Waves 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 10 to 15 kt. Waves 1 ft. A chance of showers.

$$