949
FZUS51 KLWX 171729
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
129 PM EDT Mon Aug 17 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.

ANZ500-180800-
129 PM EDT Mon Aug 17 2026

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

A cold front approaching from the upper Ohio River Valley will
cross the region by tonight. High pressure will build in from the
Midwest Tuesday. Another cold front will approach from the west late
 Wednesday into Thursday, then linger into Friday.

$$

ANZ535-180800-
Tidal Potomac from Key Bridge to Indian Head-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft. Isolated
showers and tstms.
.TONIGHT...NW winds around 5 kt. Waves 1 ft. Scattered showers and
tstms.
.TUE...N winds 5 kt. Waves less than 1 ft.
.TUE NIGHT...NW winds around 5 kt. Waves 1 ft.
.WED...W winds around 5 kt. Waves 1 ft.
.WED NIGHT...SW winds around 5 kt. Waves 1 ft or less.
.THU...N winds around 5 kt. Waves 1 ft. Showers likely with a chance
of tstms through the night. Showers likely after midnight.
.FRI...NE winds around 5 kt. Waves 1 ft. A chance of showers in the
morning. Showers likely. A chance of tstms through the night.

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

$$

ANZ536-180800-
Tidal Potomac from Indian Head to Cobb Island-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft. Isolated
showers and tstms.
.TONIGHT...NW winds around 5 kt. Waves 1 ft. Scattered showers and
tstms.
.TUE...N winds 5 kt. Waves less than 1 ft.
.TUE NIGHT...NW winds around 5 kt. Waves 1 ft.
.WED...W winds around 5 kt. Waves 1 ft.
.WED NIGHT...SW winds around 5 kt. Waves 1 ft.
.THU...N winds around 5 kt. Waves 1 ft. Showers likely with a chance
of tstms through the night. Showers likely after midnight.
.FRI...NE winds around 5 kt. Waves 1 ft. A chance of showers in the
morning. Showers likely. A chance of tstms through the night.

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

$$

ANZ537-180800-
Tidal Potomac from Cobb Island to Smith Point-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...W winds 10 kt. Waves 1 ft.
.TONIGHT...W winds around 5 kt. Waves 1 ft or less. Scattered
showers and tstms.
.TUE...N winds 5 to 10 kt. Waves 1 ft.
.TUE NIGHT...N winds around 5 kt. Waves 1 ft or less.
.WED...W winds around 5 kt. Waves flat.
.WED NIGHT...S winds 5 to 10 kt. Waves 1 ft.
.THU...S winds 5 kt. Waves less than 1 ft. Showers likely with a
chance of tstms through the night. Showers likely after midnight.
.FRI...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning, then showers likely.

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

$$

ANZ530-180800-
Chesapeake Bay north of Pooles Island-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft. Scattered
showers and tstms.
.TONIGHT...NW winds around 5 kt. Waves flat. Scattered showers and
tstms.
.TUE...N winds 5 to 10 kt. Waves 1 ft.
.TUE NIGHT...NW winds around 5 kt. Waves 1 ft or less.
.WED...W winds around 5 kt. Waves 1 ft or less.
.WED NIGHT...W winds around 5 kt. Waves flat.
.THU...N winds 5 to 10 kt. Waves 1 ft or less. Showers likely with a
chance of tstms through the night. A chance of showers after
midnight.
.FRI...NE winds 5 to 10 kt. Waves 1 ft or less. 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.

$$

ANZ531-180800-
Chesapeake Bay from Pooles Island to Sandy Point-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...W winds 5 kt. Waves less than 1 ft. Isolated
showers and tstms.
.TONIGHT...NW winds 5 to 10 kt. Waves 1 ft. Scattered showers and
tstms.
.TUE...N winds 5 to 10 kt. Waves 1 ft.
.TUE NIGHT...NW winds around 5 kt. Waves 1 ft or less.
.WED...W winds around 5 kt. Waves 1 ft or less.
.WED NIGHT...SW winds 5 kt. Waves less than 1 ft.
.THU...NE winds 5 to 10 kt. Waves 1 ft. A chance of tstms through
the night. Showers likely.
.FRI...NE 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.

$$

ANZ538-180800-
Patapsco River including Baltimore Harbor-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft. Scattered
showers and tstms.
.TONIGHT...NW winds around 5 kt. Waves flat. Scattered showers and
tstms.
.TUE...N winds 5 kt. Waves less than 1 ft.
.TUE NIGHT...NW winds around 5 kt. Waves 1 ft or less.
.WED...W winds 5 kt. Waves flat.
.WED NIGHT...W winds 5 kt. Waves flat.
.THU...NE winds 5 kt. Waves flat. A chance of tstms through the
night. Showers likely.
.FRI...NE winds around 5 kt. Waves 1 ft or less. A chance of showers
through the day. Showers likely with a chance of tstms through the
night.

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

$$

ANZ539-180800-
Chester River to Queenstown MD-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft. Isolated
showers and tstms.
.TONIGHT...NW winds around 5 kt. Waves 1 ft. Scattered showers and
tstms.
.TUE...N winds 5 to 10 kt. Waves 1 ft.
.TUE NIGHT...NW winds around 5 kt. Waves 1 ft or less.
.WED...W winds 5 kt. Waves flat.
.WED NIGHT...SW winds 5 kt. Waves flat.
.THU...N winds 5 to 10 kt. Waves 1 ft or less. Showers likely with a
chance of tstms through the night. Showers likely after midnight.
.FRI...NE winds 5 to 10 kt. Waves 1 ft or less. A chance of showers
through the day. Showers likely with a chance of tstms through the
night.

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

$$

ANZ532-180800-
Chesapeake Bay from Sandy Point to North Beach-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...NW winds 5 kt. Waves less than 1 ft. Scattered showers.
.TUE...N winds 5 to 10 kt. Waves 1 ft.
.TUE NIGHT...NW winds around 5 kt. Waves 1 ft or less.
.WED...W winds 5 kt. Waves less than 1 ft.
.WED NIGHT...SW winds 5 kt. Waves less than 1 ft.
.THU...NE winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance
of tstms through the night. Showers likely after midnight.
.FRI...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers through
the day. Showers likely with a chance of tstms through the night.

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

$$

ANZ540-180800-
Eastern Bay-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...NW winds around 5 kt. Waves flat. Scattered showers.
.TUE...N winds 5 to 10 kt. Waves 1 ft.
.TUE NIGHT...NW winds around 5 kt. Waves 1 ft or less.
.WED...W winds 5 kt. Waves flat.
.WED NIGHT...SW winds 5 kt. Waves less than 1 ft.
.THU...NE winds 5 to 10 kt. Waves 1 ft or less. Showers likely with
a chance of tstms through the night. Showers likely after midnight.
.FRI...NE winds 5 to 10 kt. Waves 1 ft or less. A chance of showers
through the day. Showers likely with a chance of tstms through the
night.

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

$$

ANZ533-180800-
Chesapeake Bay from North Beach to Drum Point-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...NW winds 5 to 10 kt. Waves 1 ft. Scattered showers and
tstms.
.TUE...N winds 5 to 10 kt. Waves 1 ft.
.TUE NIGHT...N winds 5 kt. Waves less than 1 ft.
.WED...W winds 5 kt. Waves less than 1 ft.
.WED NIGHT...SW winds 5 to 10 kt. Waves 1 ft.
.THU...N winds 5 kt...becoming E in the evening, then becoming N
after midnight. Waves 1 ft. Showers likely with a chance of tstms
through the night. Showers likely after midnight.
.FRI...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning. Showers likely. A chance of tstms through the night.

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

$$

ANZ541-180800-
Choptank River to Cambridge MD and the Little Choptank River-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...NW winds around 5 kt. Waves 1 ft or less. Scattered
showers and tstms.
.TUE...N winds 5 to 10 kt. Waves 1 ft.
.TUE NIGHT...N winds around 5 kt. Waves 1 ft or less.
.WED...W winds around 5 kt. Waves 1 ft or less.
.WED NIGHT...SW winds 5 to 10 kt. Waves 1 ft.
.THU...N winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance
of tstms through the night. Showers likely after midnight.
.FRI...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning. Showers likely. A chance of tstms through the night.

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

$$

ANZ542-180800-
Patuxent River to Broomes Island MD-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 kt. Waves less than 1 ft.
.TONIGHT...NW winds around 5 kt. Waves 1 ft. Scattered showers and
tstms.
.TUE...N winds 5 to 10 kt. Waves 1 ft.
.TUE NIGHT...N winds around 5 kt. Waves 1 ft.
.WED...W winds around 5 kt. Waves 1 ft.
.WED NIGHT...S winds around 5 kt. Waves 1 ft.
.THU...N winds around 5 kt. Waves 1 ft. Showers likely with a chance
of tstms through the night. Showers likely after midnight.
.FRI...NE winds 5 kt. Waves less than 1 ft. A chance of showers in
the morning, then showers likely.

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

$$

ANZ534-180800-
Chesapeake Bay from Drum Point to Smith Point-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 to 10 kt. Waves 1 ft.
.TONIGHT...W winds 5 to 10 kt. Waves 1 ft. Scattered showers and
tstms.
.TUE...N winds 5 to 10 kt. Waves 1 ft.
.TUE NIGHT...N winds 5 to 10 kt. Waves 1 ft.
.WED...W winds 5 kt. Waves less than 1 ft.
.WED NIGHT...S winds 5 to 10 kt. Waves 1 ft.
.THU...S winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance
of tstms through the night. Showers likely after midnight.
.FRI...E winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning, then showers likely.

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

$$

ANZ543-180800-
Tangier Sound and the inland waters surrounding Bloodsworth Island-
129 PM EDT Mon Aug 17 2026

.THIS AFTERNOON...NW winds 5 to 10 kt. Waves 1 ft.
.TONIGHT...W winds 5 kt. Waves less than 1 ft. Scattered showers and
tstms.
.TUE...NW winds 5 to 10 kt. Waves 1 ft.
.TUE NIGHT...N winds 5 to 10 kt. Waves 1 ft or less.
.WED...W winds 5 kt. Waves flat.
.WED NIGHT...S winds 5 to 10 kt. Waves 1 ft.
.THU...SW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance
of tstms through the night. Showers likely after midnight.
.FRI...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers in the
morning, then showers likely.

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

$$