National Weather Service Marine Forecast FZUS51 KLWX

FZUS51 KLWX 131458
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
1057 AM 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.

ANZ500-132000
1057 AM 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 late Sunday due to southerly channeling.

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ANZ535-132000
Tidal Potomac from Key Bridge to Indian Head
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 kt. Waves less than 1 ft.

TONIGHT
N winds around 5 kt. Waves 1 ft.

FRI
N 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 around 5 kt. Waves 1 ft.

SAT NIGHT
SE winds around 5 kt. Waves 1 ft.

SUN
SW winds 5 to 10 kt. Waves 1 ft. A chance of tstms through the night. A chance of showers.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms through the night.

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

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ANZ536-132000
Tidal Potomac from Indian Head to Cobb Island
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 kt. Waves less than 1 ft.

TONIGHT
NW winds around 5 kt. Waves 1 ft.

FRI
N winds around 5 kt. Waves 1 ft. A chance of showers.

FRI NIGHT
N winds around 5 kt. Waves 1 ft. A chance of showers.

SAT
NE winds around 5 kt. Waves 1 ft.

SAT NIGHT
SE winds 5 kt. Waves less than 1 ft.

SUN
SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms through the night. A chance of showers after midnight.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms through the night.

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

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ANZ537-132000
Tidal Potomac from Cobb Island to Smith Point
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 kt. Waves less than 1 ft.

TONIGHT
W winds around 5 kt. Waves 1 ft or less.

FRI
NE winds 5 kt. Waves less than 1 ft.

FRI NIGHT
NE winds around 5 kt. Waves 1 ft. A chance of showers.

SAT
NE winds 5 to 10 kt. Waves 1 ft.

SAT NIGHT
SE winds 5 to 10 kt. Waves 1 ft.

SUN
S winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers and tstms in the afternoon. A chance of showers through the night.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers.

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

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ANZ530-132000
Chesapeake Bay north of Pooles Island
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
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
N winds around 5 kt. Waves flat. A chance of showers.

SAT
NE winds 5 to 10 kt. Waves 1 ft.

SAT NIGHT
SE winds 5 to 10 kt. Waves flat.

SUN
S winds 10 to 15 kt...becoming SW after midnight. Waves 1 ft. A chance of showers in the afternoon. A chance of tstms. Showers likely through the night.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night.

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

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ANZ531-132000
Chesapeake Bay from Pooles Island to Sandy Point
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 to 10 kt. Waves 1 ft.

TONIGHT
N winds around 5 kt. Waves 1 ft or less.

FRI
NE winds 5 kt. Waves less than 1 ft.

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.

SAT NIGHT
SE winds 5 to 10 kt. Waves 1 ft.

SUN
S winds 10 to 15 kt...becoming SW after midnight. Waves 1 to 2 ft. A chance of showers and tstms.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night.

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

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ANZ538-132000
Patapsco River including Baltimore Harbor
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
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 to 10 kt. Waves 1 ft.

SAT NIGHT
SE winds 5 kt. Waves less than 1 ft.

SUN
S winds 10 to 15 kt...becoming SW 5 to 10 kt after midnight. Waves 1 ft. A chance of showers and tstms.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night.

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

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ANZ539-132000
Chester River to Queenstown MD
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 to 10 kt. Waves 1 ft.

TONIGHT
N winds around 5 kt. Waves 1 ft or less.

FRI
NE winds 5 kt. Waves less than 1 ft. A chance of showers.

FRI NIGHT
NE winds around 5 kt. Waves 1 ft or less. A chance of showers.

SAT
NE winds 5 to 10 kt. Waves 1 ft.

SAT NIGHT
SE winds 5 kt. Waves less than 1 ft.

SUN
S winds 10 to 15 kt...becoming SW after midnight. Waves 1 to 2 ft. A chance of showers and tstms.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night.

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

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ANZ532-132000
Chesapeake Bay from Sandy Point to North Beach
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 to 10 kt. Waves 1 ft.

TONIGHT
NW winds 5 kt. Waves less than 1 ft.

FRI
NE winds 5 kt. Waves less than 1 ft. 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.

SAT NIGHT
SE winds 5 to 10 kt. Waves 1 ft.

SUN
S winds 5 to 10 kt...becoming SW 15 to 20 kt. Waves 1 ft... building to 2 to 3 ft. A chance of showers and tstms.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night.

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

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ANZ540-132000
Eastern Bay
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 to 10 kt. Waves 1 ft.

TONIGHT
NW winds around 5 kt. Waves 1 ft or less.

FRI
NE winds 5 kt. Waves less than 1 ft. A chance of showers.

FRI NIGHT
NE winds around 5 kt. Waves flat. A chance of showers.

SAT
NE winds 5 to 10 kt. Waves 1 ft.

SAT NIGHT
SE winds 5 to 10 kt. Waves 1 ft.

SUN
S winds 10 to 15 kt...becoming SW after midnight. Waves 1 to 2 ft. A chance of showers and tstms.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night.

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

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ANZ533-132000
Chesapeake Bay from North Beach to Drum Point
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 to 10 kt. Waves 1 ft.

TONIGHT
W winds around 5 kt. Waves 1 ft.

FRI
NE winds 5 kt. Waves less than 1 ft. 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.

SAT NIGHT
SE winds 5 to 10 kt. Waves 1 ft.

SUN
S winds 5 to 10 kt...becoming SW 15 to 20 kt. Waves 1 ft... building to 2 to 3 ft. A chance of showers and tstms through the night. A chance of showers after midnight.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers.

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

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ANZ541-132000
Choptank River to Cambridge MD and the Little Choptank River
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 to 10 kt. Waves 1 ft.

TONIGHT
NW winds around 5 kt. Waves flat.

FRI
NE winds 5 kt. Waves less than 1 ft. A chance of showers.

FRI NIGHT
NE winds around 5 kt. Waves 1 ft or less. A chance of showers.

SAT
NE winds 5 to 10 kt. Waves 1 ft.

SAT NIGHT
SE winds 5 to 10 kt. Waves 1 ft.

SUN
S winds 10 to 15 kt...becoming SW after midnight. Waves 1 to 2 ft. A chance of showers and tstms through the night. A chance of showers after midnight.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers.

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

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ANZ542-132000
Patuxent River to Broomes Island MD
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 kt. Waves less than 1 ft.

TONIGHT
N winds around 5 kt. Waves 1 ft.

FRI
NE winds around 5 kt. Waves 1 ft.

FRI NIGHT
NE winds around 5 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 kt. Waves less than 1 ft.

SUN
S winds 10 to 15 kt. Waves 1 ft. A chance of showers and tstms through the night. A chance of showers after midnight.

MON
NW winds 5 to 10 kt. Waves 1 ft. A chance of showers.

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

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ANZ534-132000
Chesapeake Bay from Drum Point to Smith Point
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 to 10 kt...becoming SW late. Waves 1 ft.

TONIGHT
S winds 5 kt. Waves less than 1 ft.

FRI
NE winds 5 kt. Waves less than 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.

SAT NIGHT
SE winds 5 to 10 kt. Waves 2 ft.

SUN
S winds 15 to 20 kt...becoming SW after midnight. Waves 1 ft...building to 3 ft. A chance of showers.

MON
W winds 10 to 15 kt...becoming NW 5 to 10 kt. Waves 1 to 2 ft. A chance of showers.

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ANZ543-132000
Tangier Sound and the inland waters surrounding Bloodsworth Island
1057 AM EDT Thu Aug 13 2026

REST OF TODAY
NW winds 5 to 10 kt. Waves 1 ft.

TONIGHT
SW winds 5 kt. Waves flat.

FRI
NE winds 5 kt. Waves less than 1 ft. A chance of showers.

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.

SAT NIGHT
SE winds 5 to 10 kt. Waves 1 ft.

SUN
S winds 15 to 20 kt. Waves 1 to 2 ft. A chance of showers.

MON
W winds 10 to 15 kt...becoming NW 5 to 10 kt. Waves 1 to 2 ft. A chance of showers.