135
FZUS51 KLWX 132057
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
457 PM EDT Thu Aug 13 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.

ANZ500-140800-
457 PM EDT Thu Aug 13 2026

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

A stationary frontal boundary will remain off to the south near the
Virginia-North Carolina border through tonight. This system returns
northward as a warm front Friday which increases thunderstorm
chances. High pressure builds across the northeastern U.S on
Saturday before another frontal system approaches from the west on
Sunday into Monday. Small Craft Advisories may be needed Sunday
afternoon into the night due to southerly channeling.

$$

ANZ535-140800-
Tidal Potomac from Key Bridge to Indian Head-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...N winds around 5 kt. Waves 1 ft or less.
.FRI...NE winds around 5 kt. Waves 1 ft. A chance of showers.
.FRI NIGHT...NE winds around 5 kt. Waves 1 ft. A chance of showers
and tstms.
.SAT...NE winds around 5 kt. Waves 1 ft. A chance of showers.
.SAT NIGHT...SE winds around 5 kt. Waves 1 ft. A chance of showers.
.SUN...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers. A
chance of tstms.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers. A
chance of tstms through the night.

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

$$

ANZ536-140800-
Tidal Potomac from Indian Head to Cobb Island-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...NE winds around 5 kt. Waves 1 ft.
.FRI...NE winds around 5 kt. Waves 1 ft. A chance of showers.
.FRI NIGHT...NE winds around 5 kt. Waves 1 ft. A chance of showers
and tstms.
.SAT...NE winds 5 kt. Waves less than 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 kt. Waves less than 1 ft. A chance of
showers.
.SUN...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers. A
chance of tstms.
.MON...NW winds 5 kt. Waves less than 1 ft. A chance of tstms
through the night. A chance of showers.

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

$$

ANZ537-140800-
Tidal Potomac from Cobb Island to Smith Point-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds around 5 kt. Waves 1 ft or less.
.FRI...NE winds around 5 kt. Waves 1 ft or less. A chance of
showers.
.FRI NIGHT...NE winds 5 kt. Waves less than 1 ft. A chance of
showers.
.SAT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN...S winds 10 to 15 kt...becoming SW 5 to 10 kt after midnight.
Waves 1 to 2 ft. A chance of showers. A chance of tstms.
.MON...NW 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.

$$

ANZ530-140800-
Chesapeake Bay north of Pooles Island-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...N winds around 5 kt. Waves 1 ft.
.FRI...E winds around 5 kt. Waves 1 ft.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN...S winds 10 to 15 kt...becoming W 5 to 10 kt after midnight.
Waves 1 ft. A chance of showers in the morning, then showers likely
with a chance of tstms.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning, then a chance of showers and tstms through the night.

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

$$

ANZ531-140800-
Chesapeake Bay from Pooles Island to Sandy Point-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...N winds around 5 kt. Waves 1 ft or less.
.FRI...NE winds around 5 kt. Waves flat.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 ft or less. A chance of
showers.
.SAT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN...S winds 10 to 15 kt...becoming W after midnight. Waves 1 to
2 ft. A chance of showers in the morning, then showers likely with a
chance of tstms.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning, then a chance of showers and tstms through the night.

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

$$

ANZ538-140800-
Patapsco River including Baltimore Harbor-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...N winds around 5 kt. Waves 1 ft or less.
.FRI...NE winds 5 kt. Waves flat.
.FRI NIGHT...NE winds around 5 kt. Waves flat. A chance of showers.
.SAT...NE winds 5 kt. Waves less than 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 kt. Waves less than 1 ft. A chance of
showers.
.SUN...S winds 10 to 15 kt...becoming W 5 to 10 kt after midnight.
Waves 1 ft. A chance of showers in the morning, then showers likely
with a chance of tstms.
.MON...NW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers
in the morning, then a chance of showers and tstms through the
night.

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

$$

ANZ539-140800-
Chester River to Queenstown MD-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...NW winds around 5 kt. Waves 1 ft or less.
.FRI...NE winds around 5 kt. Waves flat.
.FRI NIGHT...NE winds around 5 kt. Waves flat. A chance of showers.
.SAT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN...S winds 10 to 15 kt...becoming W 5 to 10 kt after midnight.
Waves 1 to 2 ft. A chance of showers in the morning, then showers
likely with a chance of tstms.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning, then a chance of showers and tstms through the night.

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

$$

ANZ532-140800-
Chesapeake Bay from Sandy Point to North Beach-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...NW winds around 5 kt. Waves 1 ft or less.
.FRI...NE winds 5 kt. Waves less than 1 ft.
.FRI NIGHT...NE winds 5 kt. Waves less than 1 ft. A chance of
showers.
.SAT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN...S winds 10 to 15 kt...becoming W after midnight. Waves 2 to
3 ft. A chance of showers through the day. A chance of tstms.
Showers likely through the night.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers. A
chance of tstms through the night.

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

$$

ANZ540-140800-
Eastern Bay-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...NW winds around 5 kt. Waves 1 ft or less.
.FRI...NE winds around 5 kt. Waves flat.
.FRI NIGHT...NE winds around 5 kt. Waves flat. A chance of showers.
.SAT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN...S winds 10 to 15 kt...becoming W after midnight. Waves 1 to
2 ft. A chance of showers through the day. A chance of tstms.
Showers likely through the night.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers. A
chance of tstms through the night.

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

$$

ANZ533-140800-
Chesapeake Bay from North Beach to Drum Point-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds around 5 kt. Waves 1 ft or less.
.FRI...NE winds 5 kt. Waves less than 1 ft.
.FRI NIGHT...NE winds 5 kt. Waves less than 1 ft. A chance of
showers.
.SAT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN...S winds 10 to 15 kt...becoming SW after midnight. Waves
1 ft...building to 2 to 3 ft. A chance of showers. A chance of
tstms.
.MON...NW 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.

$$

ANZ541-140800-
Choptank River to Cambridge MD and the Little Choptank River-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...SW winds around 5 kt. Waves flat.
.FRI...NE winds 5 kt. Waves flat.
.FRI NIGHT...NE winds 5 kt. Waves less than 1 ft. A chance of
showers.
.SAT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN...S winds 10 to 15 kt...becoming SW after midnight. Waves 1 to
2 ft. A chance of showers through the day. A chance of tstms.
Showers likely through the night.
.MON...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers. A
chance of tstms through the night.

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

$$

ANZ542-140800-
Patuxent River to Broomes Island MD-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...W winds 5 kt. Waves less than 1 ft.
.TONIGHT...NE winds around 5 kt. Waves 1 ft or less.
.FRI...NE winds around 5 kt. Waves 1 ft. A chance of showers.
.FRI NIGHT...NE winds around 5 kt. Waves 1 ft. A chance of showers.
.SAT...NE winds 5 kt. Waves less than 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 kt. Waves less than 1 ft. A chance of
showers.
.SUN...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. A chance
of tstms.
.MON...NW winds around 5 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.

$$

ANZ534-140800-
Chesapeake Bay from Drum Point to Smith Point-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...SW winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 5 kt. Waves less than 1 ft.
.FRI...NE winds 5 kt. Waves less than 1 ft. A chance of showers.
.FRI NIGHT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT NIGHT...SE winds 10 kt. Waves 1 ft. A chance of showers.
.SUN...S winds 10 to 15 kt...becoming SW after midnight. Waves 2 to
3 ft. A chance of showers in the morning, then a chance of showers
and tstms.
.MON...NW winds 5 to 10 kt. Waves 1 to 2 ft. A chance of tstms
through the night. A chance of showers.

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

$$

ANZ543-140800-
Tangier Sound and the inland waters surrounding Bloodsworth Island-
457 PM EDT Thu Aug 13 2026

.REST OF THIS AFTERNOON...W winds 5 kt. Waves less than 1 ft.
.TONIGHT...S winds 5 kt. Waves less than 1 ft.
.FRI...E winds 5 kt. Waves flat. A chance of showers.
.FRI NIGHT...E winds 5 kt. Waves less than 1 ft. A chance of
showers.
.SAT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SAT NIGHT...SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
.SUN...S winds 15 to 20 kt...becoming SW after midnight. Waves 1 to
2 ft. A chance of showers. A chance of tstms through the night.
.MON...NW 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.

$$