508
FZUS51 KLWX 200233
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
1033 PM EDT Tue Aug 19 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.

ANZ500-200800-
1033 PM EDT Tue Aug 19 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.

$$

ANZ535-200800-
Tidal Potomac from Key Bridge to Indian Head-
1033 PM EDT Tue Aug 19 2025

.REST OF TONIGHT...E winds 5 kt. Waves less than 1 ft. Patchy
drizzle.
.WED...E winds around 5 kt. Waves 1 ft. A chance of showers with
patchy drizzle.
.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 around 5 kt. Waves 1 ft. A chance of showers.

$$

ANZ536-200800-
Tidal Potomac from Indian Head to Cobb Island-
1033 PM EDT Tue Aug 19 2025

.REST OF TONIGHT...E winds 5 to 10 kt. Waves 1 ft. Patchy drizzle.
.WED...E winds 5 kt. Waves less than 1 ft. A chance of showers. Vsby
1 NM or less.
.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 5 kt. Waves less than 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 kt. Waves less than 1 ft. A chance of showers.

$$

ANZ537-200800-
Tidal Potomac from Cobb Island to Smith Point-
1033 PM EDT Tue Aug 19 2025

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

.REST OF TONIGHT...E winds 10 to 15 kt. Gusts up to 20 kt late this
evening and early morning. Waves 1 to 2 ft. Isolated tstms with
patchy drizzle. Scattered showers late this evening, then isolated
showers.
.WED...E winds 5 to 10 kt. Waves 1 ft. Patchy drizzle.
.WED NIGHT...E winds 10 to 15 kt with gusts to 25 kt...becoming NE
15 to 20 kt with gusts to 25 kt late. 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.

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

$$

ANZ530-200800-
Chesapeake Bay north of Pooles Island-
1033 PM EDT Tue Aug 19 2025

.REST OF TONIGHT...E winds 10 kt. Waves 1 ft. Patchy drizzle late
this evening, then areas of drizzle.
.WED...E winds 5 to 10 kt. Waves 1 ft. A chance of showers, tstms
with patchy drizzle. Vsby 1 to 3 NM.
.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. A chance of showers after
midnight.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

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

$$

ANZ531-200800-
Chesapeake Bay from Pooles Island to Sandy Point-
1033 PM EDT Tue Aug 19 2025

.REST OF TONIGHT...E winds 10 kt. Waves 1 ft. Areas of drizzle late
this evening, then patchy drizzle.
.WED...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers, tstms
with patchy drizzle.
.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 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 to 10 kt. Waves 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers after
midnight.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

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

$$

ANZ538-200800-
Patapsco River including Baltimore Harbor-
1033 PM EDT Tue Aug 19 2025

.REST OF TONIGHT...E winds 5 to 10 kt. Waves 1 ft. Areas of drizzle
late this evening, then patchy drizzle.
.WED...E winds 5 to 10 kt. Waves 1 ft. A chance of showers, tstms
with patchy drizzle.
.WED NIGHT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers and
tstms.
.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 5 kt. Waves less than 1 ft.
.SAT...S winds 5 to 10 kt. Waves 1 ft or less. A chance of showers
after midnight.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

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

$$

ANZ539-200800-
Chester River to Queenstown MD-
1033 PM EDT Tue Aug 19 2025

.REST OF TONIGHT...E winds 10 kt. Waves 1 ft. Areas of drizzle.
.WED...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers, tstms
with patchy drizzle.
.WED NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt. Waves 1 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 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.

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

$$

ANZ532-200800-
Chesapeake Bay from Sandy Point to North Beach-
1033 PM EDT Tue Aug 19 2025

.REST OF TONIGHT...E winds 10 kt. Waves 1 to 2 ft. Areas of drizzle.
.WED...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers with
areas of drizzle.
.WED NIGHT...E winds 10 to 15 kt with gusts to 20 kt...becoming NE
with gusts to 25 kt late. Waves 2 ft. A chance of showers.
.THU...NE winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft.
.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 5 to 10 kt. Waves 1 to 2 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

$$

ANZ540-200800-
Eastern Bay-
1033 PM EDT Tue Aug 19 2025

.REST OF TONIGHT...E winds 10 kt. Waves 1 ft. Areas of drizzle.
.WED...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers with
areas of drizzle.
.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.
.THU...NE winds 15 kt with gusts to 25 kt. Waves 2 ft.
.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 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.

$$

ANZ533-200800-
Chesapeake Bay from North Beach to Drum Point-
1033 PM EDT Tue Aug 19 2025

.REST OF TONIGHT...E winds 10 kt. Waves 1 to 2 ft. Areas of drizzle.
Isolated tstms.
.WED...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers with
areas of drizzle. Vsby 1 NM or less.
.WED NIGHT...E winds 10 to 15 kt with gusts to 20 kt...becoming NE
15 to 20 kt with gusts to 25 kt late. Waves 2 to 3 ft.
.THU...NE winds 15 to 20 kt with gusts to 30 kt. Waves 3 ft.
.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 5 to 10 kt. Waves 1 to 2 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

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

$$

ANZ541-200800-
Choptank River to Cambridge MD and the Little Choptank River-
1033 PM EDT Tue Aug 19 2025

.REST OF TONIGHT...E winds 10 kt. Waves 1 ft. Areas of drizzle.
Isolated tstms.
.WED...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers with
patchy drizzle. Vsby 1 NM or less.
.WED NIGHT...E winds 10 to 15 kt with gusts to 20 kt...becoming NE
15 to 20 kt with gusts to 25 kt late. Waves 1 to 2 ft.
.THU...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft.
.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 5 to 10 kt. Waves 1 ft.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

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

$$

ANZ542-200800-
Patuxent River to Broomes Island MD-
1033 PM EDT Tue Aug 19 2025

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

.REST OF TONIGHT...E winds 5 to 10 kt. Waves 1 ft. Areas of drizzle
with isolated tstms late this evening, then isolated tstms with
patchy drizzle.
.WED...E winds 5 to 10 kt. Waves 1 ft. Areas of drizzle.
.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.

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

$$

ANZ534-200800-
Chesapeake Bay from Drum Point to Smith Point-
1033 PM EDT Tue Aug 19 2025

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

.REST OF TONIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves
2 ft. Areas of drizzle with possible showers and tstms late this
evening, then isolated showers, tstms with patchy drizzle with vsby
1 NM or less.
.WED...SE winds 10 kt. Waves 1 ft.
.WED NIGHT...E winds 15 to 20 kt...becoming NE late. Gusts up to
25 kt. Waves 2 to 3 ft.
.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 5 to 10 kt. Waves 1 to 2 ft.
.SUN...S winds 5 to 10 kt. Waves 1 to 2 ft. A chance of showers.

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

$$

ANZ543-200800-
Tangier Sound and the inland waters surrounding Bloodsworth Island-
1033 PM EDT Tue Aug 19 2025

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

.REST OF TONIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves
1 ft. Isolated tstms with patchy drizzle. Isolated showers. Vsby
1 NM or less.
.WED...SE winds 10 kt. Waves 1 ft. Areas of drizzle.
.WED NIGHT...E winds 10 to 15 kt...becoming NE 15 to 20 kt late.
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 5 to 10 kt. Waves 1 ft. A chance of showers.

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

$$