986
FZUS51 KLWX 202057
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
457 PM EDT Sun Sep 20 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.

ANZ500-210800-
457 PM EDT Sun Sep 20 2026

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

A cold front will slowly drop southward across the area through
Monday. A strong area of high pressure will build to our north
Monday and remain in place through much of the week, leading to a
prolonged period of onshore flow. Several waves of low pressure may
track along the stalled front to our south during this time. Small
Craft Advisories will likely be needed for much of the Monday night
through Thursday time period, and a few low-end Gale gusts can`t be
ruled out on Tuesday or Wednesday.

$$

ANZ535-210800-
Tidal Potomac from Key Bridge to Indian Head-
457 PM EDT Sun Sep 20 2026

.REST OF THIS AFTERNOON...SW 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.
.MON...NE winds 10 kt. Waves 1 ft.
.MON NIGHT...E winds 10 kt. Waves 1 ft. Widespread showers.
.TUE...NE winds 10 to 15 kt. Waves 1 ft. Showers.
.TUE NIGHT...NE winds 10 to 15 kt. Waves 1 ft. Showers likely.
.WED...NE winds 10 to 15 kt. Waves 1 ft. Showers likely, mainly in
the morning.
.THU...NE winds 10 to 15 kt. Waves 1 ft. A chance of showers through
the day.

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

$$

ANZ536-210800-
Tidal Potomac from Indian Head to Cobb Island-
457 PM EDT Sun Sep 20 2026

.REST OF THIS AFTERNOON...SW winds 5 kt. Waves less than 1 ft.
Scattered showers with isolated tstms.
.TONIGHT...W winds around 5 kt...becoming N late. Waves 1 ft.
Scattered showers and tstms.
.MON...NE winds 10 kt. Waves 1 ft.
.MON NIGHT...E winds 10 kt. Waves 1 ft. Widespread showers.
.TUE...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers
with a chance of tstms.
.TUE NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Showers likely.
.WED...NE winds 15 to 20 kt. Waves 1 to 2 ft. Showers likely through
the day, then a chance of showers through the night.
.THU...N winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers
through the day.

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

$$

ANZ537-210800-
Tidal Potomac from Cobb Island to Smith Point-
457 PM EDT Sun Sep 20 2026

.REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft.
.TONIGHT...S winds 5 to 10 kt...becoming NW after midnight. Waves
1 ft. Scattered showers and tstms.
.MON...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 3 ft.
Numerous showers.
.TUE...NE winds 15 to 20 kt. Gusts up to 25 kt in the afternoon.
Waves 2 to 3 ft. Showers with a chance of tstms.
.TUE NIGHT...NE winds 15 to 20 kt with gusts to 30 kt. Waves 4 ft.
Showers likely.
.WED...NE winds 20 to 25 kt. Waves 4 ft. Showers likely through the
day, then a chance of showers through the night.
.THU...NE winds 20 to 25 kt. Waves 4 ft. A chance of showers.

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

$$

ANZ530-210800-
Chesapeake Bay north of Pooles Island-
457 PM EDT Sun Sep 20 2026

.REST OF THIS AFTERNOON...SW winds 5 kt. Waves less than 1 ft.
Scattered showers and tstms.
.TONIGHT...W winds 5 kt...becoming N after midnight. Waves 1 ft.
Numerous showers and scattered tstms.
.MON...NE winds 10 to 15 kt. Waves 1 ft.
.MON NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Widespread showers.
.TUE...NE winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft.
Showers.
.TUE NIGHT...NE winds 15 kt with gusts to 25 kt. Waves 2 ft. A
chance of showers.
.WED...NE winds 15 to 20 kt. Waves 2 ft. A chance of showers through
the day.
.THU...NE winds 15 to 20 kt. Waves 2 ft.

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

$$

ANZ531-210800-
Chesapeake Bay from Pooles Island to Sandy Point-
457 PM EDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY IN EFFECT MONDAY MORNING...

.REST OF THIS AFTERNOON...S winds 10 kt. Waves 2 ft. Isolated
showers and tstms.
.TONIGHT...SW winds 5 kt...becoming N 10 to 15 kt with gusts to
20 kt after midnight. Waves 1 to 2 ft. Numerous showers and
scattered tstms.
.MON...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Widespread showers.
.TUE...NE winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft.
Showers.
.TUE NIGHT...NE winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft.
Showers likely.
.WED...NE winds 20 to 25 kt. Waves 3 ft. A chance of showers.
.THU...NE winds 20 to 25 kt. Waves 3 ft.

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

$$

ANZ538-210800-
Patapsco River including Baltimore Harbor-
457 PM EDT Sun Sep 20 2026

.REST OF THIS AFTERNOON...SW winds 5 kt. Waves less than 1 ft.
Isolated showers and tstms.
.TONIGHT...W winds 5 kt...becoming N after midnight. Waves 1 ft.
Numerous showers and scattered tstms.
.MON...NE winds 10 to 15 kt. Waves 1 ft.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Widespread showers.
.TUE...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft.
Showers.
.TUE NIGHT...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft.
Showers likely.
.WED...NE winds 15 to 20 kt. Waves 2 ft. A chance of showers.
.THU...NE winds 10 to 15 kt. Waves 1 to 2 ft.

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

$$

ANZ539-210800-
Chester River to Queenstown MD-
457 PM EDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY IN EFFECT MONDAY MORNING...

.REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft. Isolated
showers and tstms.
.TONIGHT...SW winds 5 kt...becoming N after midnight. Waves 1 ft.
Scattered showers and tstms.
.MON...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 to
2 ft. Widespread showers.
.TUE...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft.
Showers.
.TUE NIGHT...NE winds 20 kt with gusts to 25 kt. Waves 2 ft. Showers
likely.
.WED...NE winds 15 to 20 kt. Waves 2 to 3 ft. A chance of showers.
.THU...NE winds 15 to 20 kt. Waves 2 to 3 ft.

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

$$

ANZ532-210800-
Chesapeake Bay from Sandy Point to North Beach-
457 PM EDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY IN EFFECT MONDAY MORNING...

.REST OF THIS AFTERNOON...S winds 10 kt. Waves 2 ft. Isolated
showers and tstms.
.TONIGHT...SW winds 5 to 10 kt...becoming N 10 to 15 kt after
midnight. Waves 2 ft. Scattered showers and tstms.
.MON...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Widespread showers.
.TUE...NE winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft.
Showers.
.TUE NIGHT...NE winds 20 kt with gusts to 25 kt. Waves 3 ft. Showers
likely.
.WED...NE winds 20 to 25 kt. Waves 3 ft. Showers likely, mainly in
the morning.
.THU...NE winds 20 to 25 kt. Waves 3 ft. A chance of showers in the
morning.

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

$$

ANZ540-210800-
Eastern Bay-
457 PM EDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY IN EFFECT MONDAY MORNING...

.REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft. Isolated
showers and tstms.
.TONIGHT...SW winds 5 to 10 kt...becoming N 10 to 15 kt after
midnight. Waves 1 ft. Scattered showers and tstms.
.MON...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Widespread showers.
.TUE...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft.
Showers.
.TUE NIGHT...NE winds 20 kt with gusts to 25 kt. Waves 2 ft. Showers
likely.
.WED...NE winds 20 to 25 kt. Waves 2 ft. Showers likely, mainly in
the morning.
.THU...NE winds 15 to 20 kt. Waves 2 ft. A chance of showers in the
morning.

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

$$

ANZ533-210800-
Chesapeake Bay from North Beach to Drum Point-
457 PM EDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY IN EFFECT MONDAY MORNING...

.REST OF THIS AFTERNOON...S winds 10 kt. Waves 2 ft. Isolated
showers and tstms.
.TONIGHT...SW winds 5 to 10 kt...becoming N 10 to 15 kt after
midnight. Waves 2 ft. Scattered showers and tstms.
.MON...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Widespread showers.
.TUE...NE winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft.
Showers.
.TUE NIGHT...NE winds 20 kt with gusts to 30 kt. Waves 4 ft. Showers
likely.
.WED...NE winds 20 kt...increasing to 25 to 30 kt. Waves 4 ft.
Showers likely, mainly in the morning.
.THU...NE winds 20 to 25 kt. Waves 4 ft. A chance of showers in the
morning.

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

$$

ANZ541-210800-
Choptank River to Cambridge MD and the Little Choptank River-
457 PM EDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY IN EFFECT MONDAY MORNING...

.REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft. Isolated
showers and tstms.
.TONIGHT...SW winds 5 to 10 kt...becoming N 10 to 15 kt after
midnight. Waves 1 ft. Scattered showers and tstms.
.MON...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Widespread showers.
.TUE...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft.
Showers.
.TUE NIGHT...NE winds 20 kt with gusts to 25 kt. Waves 3 ft. Showers
likely.
.WED...NE winds 20 to 25 kt. Waves 3 ft. Showers likely, mainly in
the morning.
.THU...NE winds 20 to 25 kt. Waves 3 ft. A chance of showers in the
morning.

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

$$

ANZ542-210800-
Patuxent River to Broomes Island MD-
457 PM EDT Sun Sep 20 2026

.REST OF THIS AFTERNOON...S winds 5 kt. Waves less than 1 ft.
Isolated showers and tstms.
.TONIGHT...SW winds 5 kt...becoming N late. Waves 1 ft. Scattered
showers and tstms.
.MON...NE winds 10 to 15 kt. Waves 1 ft.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Widespread showers.
.TUE...NE winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft. Showers
with a chance of tstms.
.TUE NIGHT...NE winds 15 to 20 kt with gusts to 25 kt. Waves 1 ft.
Showers likely.
.WED...NE winds 15 to 20 kt. Waves 1 ft. Showers likely through the
day, then a chance of showers through the night.
.THU...NE winds 15 to 20 kt. Waves 1 ft. A chance of showers in the
morning.

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

$$

ANZ534-210800-
Chesapeake Bay from Drum Point to Smith Point-
457 PM EDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY IN EFFECT MONDAY MORNING...

.REST OF THIS AFTERNOON...S winds 15 kt. Waves 2 ft.
.TONIGHT...S winds 10 to 15 kt...becoming NW 5 to 10 kt after
midnight. Waves 2 ft. Scattered showers.
.MON...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 3 ft.
Numerous showers.
.TUE...E winds 15 to 20 kt. Gusts up to 20 kt... increasing to 30 kt
in the afternoon. Waves 2 ft...building to 4 ft in the afternoon.
Showers with a chance of tstms.
.TUE NIGHT...NE winds 20 to 25 kt with gusts to 30 kt. Waves 5 ft.
Showers likely.
.WED...NE winds 25 to 30 kt. Waves 5 ft. Showers likely through the
day, then a chance of showers through the night.
.THU...NE winds 20 to 25 kt. Waves 4 ft. A chance of showers.

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

$$

ANZ543-210800-
Tangier Sound and the inland waters surrounding Bloodsworth Island-
457 PM EDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY IN EFFECT MONDAY MORNING...

.REST OF THIS AFTERNOON...S winds 15 kt. Waves 2 ft.
.TONIGHT...SW winds 5 to 10 kt...becoming NW late. Waves 1 to 2 ft.
Scattered showers.
.MON...NE winds 10 to 15 kt. Gusts up to 20 kt. Waves 1 ft.
.MON NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 to
2 ft. Scattered showers.
.TUE...NE winds 15 to 20 kt. Gusts up to 25 kt in the afternoon.
Waves 1 to 2 ft. Showers likely with a chance of tstms.
.TUE NIGHT...NE winds 20 to 25 kt with gusts to 30 kt. Waves 3 ft.
Showers likely.
.WED...NE winds 20 to 25 kt. Waves 3 ft. A chance of showers.
.THU...NE winds 20 to 25 kt. Waves 3 ft. A chance of showers.

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

$$