National Weather Service Marine Forecast FZUS51 KLWX

FZUS51 KLWX 030258
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
1057 PM EDT Wed Sep 2 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.

ANZ500-030800
1057 PM EDT Wed Sep 2 2026

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

Scattered to numerous showers and thunderstorms are expected through Friday in a hot and humid air mass. Special Marine Warnings may be needed each afternoon through at least Friday for strong thunderstorms moving over the waters. Small Craft Advisories may be needed Friday night through Saturday.

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ANZ535-030800
Tidal Potomac from Key Bridge to Indian Head
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds around 5 kt. Waves 1 ft. A slight chance of showers and tstms.

THU
W winds around 5 kt. Waves 1 ft. A chance of showers and tstms.

THU NIGHT
SW winds around 5 kt. Waves 1 ft. A chance of showers and tstms.

FRI
NW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms.

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

SAT
N winds 5 kt. Waves less than 1 ft.

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

SUN
E winds around 5 kt. Waves 1 ft.

MON
SE winds around 5 kt. Waves 1 ft.

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

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ANZ536-030800
Tidal Potomac from Indian Head to Cobb Island
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 kt. Waves less than 1 ft. A slight chance of showers and tstms.

THU
SW winds around 5 kt. Waves 1 ft. A chance of showers and tstms.

THU NIGHT
SW winds around 5 kt. Waves 1 ft. A chance of showers and tstms.

FRI
W winds around 5 kt. Waves 1 ft. A chance of showers and tstms.

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

SAT
N winds 5 kt. Waves less than 1 ft.

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

SUN
NE winds around 5 kt. Waves 1 ft.

MON
SE winds around 5 kt. Waves 1 ft.

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

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ANZ537-030800
Tidal Potomac from Cobb Island to Smith Point
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 kt. Waves less than 1 ft. A slight chance of showers.

THU
SW winds 5 to 10 kt. Waves 1 ft.

THU NIGHT
S winds 5 to 10 kt...becoming W after midnight. Waves 1 ft. A chance of showers and tstms.

FRI
NW winds around 5 kt. Waves 1 ft. Showers likely.

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

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

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

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

MON
SE winds 5 to 10 kt...becoming S after midnight. Waves 1 ft.

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

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ANZ530-030800
Chesapeake Bay north of Pooles Island
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.

THU
SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.

THU NIGHT
W winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.

FRI
NW winds around 5 kt. Waves 1 ft or less. Showers likely with a chance of tstms.

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

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

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

SUN
E winds 5 to 10 kt. Waves 1 ft or less.

MON
S winds around 5 kt. Waves 1 ft or less.

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

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ANZ531-030800
Chesapeake Bay from Pooles Island to Sandy Point
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 to 10 kt. Waves 1 ft. A chance of showers. A slight chance of tstms late this evening, then a chance of tstms.

THU
SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.

THU NIGHT
W winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.

FRI
NW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms.

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

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

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

SUN
NE winds 5 to 10 kt...becoming SE after midnight. Waves 1 ft.

MON
SE winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft.

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

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ANZ538-030800
Patapsco River including Baltimore Harbor
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 kt. Waves flat. A slight chance of tstms. A slight chance of showers late this evening, then a chance of showers.

THU
SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.

THU NIGHT
W winds around 5 kt. Waves 1 ft or less. A chance of showers and tstms.

FRI
NW winds around 5 kt. Waves 1 ft or less. Showers likely with a chance of tstms.

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

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

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

SUN
E winds 5 to 10 kt. Waves 1 ft.

MON
SE winds around 5 kt. Waves 1 ft or less.

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

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ANZ539-030800
Chester River to Queenstown MD
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 kt. Waves less than 1 ft. A chance of showers. A slight chance of tstms late this evening, then a chance of tstms.

THU
SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.

THU NIGHT
SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.

FRI
NW winds around 5 kt. Waves 1 ft or less. Showers likely with a chance of tstms.

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

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

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

SUN
NE winds 5 to 10 kt...becoming SE after midnight. Waves 1 ft.

MON
S winds around 5 kt. Waves 1 ft or less.

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

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ANZ532-030800
Chesapeake Bay from Sandy Point to North Beach
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 to 10 kt. Waves 1 ft. A slight chance of tstms. A slight chance of showers late this evening, then a chance of showers.

THU
S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

THU NIGHT
SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.

FRI
NW winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms.

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

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

SAT NIGHT
NE winds 10 kt. Waves 1 ft.

SUN
NE winds 5 to 10 kt...becoming SE after midnight. Waves 1 ft.

MON
SE winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft.

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

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ANZ540-030800
Eastern Bay
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 kt. Waves less than 1 ft. A slight chance of tstms. A slight chance of showers late this evening, then a chance of showers.

THU
S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

THU NIGHT
SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.

FRI
NW winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms.

FRI NIGHT
NW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers.

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

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

SUN
E winds 5 to 10 kt. Waves 1 ft.

MON
SE winds 5 to 10 kt...becoming S after midnight. Waves 1 ft or less.

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

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ANZ533-030800
Chesapeake Bay from North Beach to Drum Point
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 to 10 kt. Waves 1 ft. A slight chance of showers and tstms.

THU
S winds 5 to 10 kt. Waves 1 ft. A chance of showers.

THU NIGHT
SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.

FRI
NW winds 5 kt. Waves less than 1 ft. Showers likely.

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

SAT
N winds 5 to 10 kt. Waves 2 ft.

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

SUN
E winds 5 to 10 kt. Waves 1 ft.

MON
SE winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft.

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

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ANZ541-030800
Choptank River to Cambridge MD and the Little Choptank River
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 kt. Waves less than 1 ft. A chance of showers with a slight chance of tstms.

THU
SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.

THU NIGHT
SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.

FRI
NW winds 5 to 10 kt. Waves 1 ft. Showers likely.

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

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

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

SUN
E winds 5 to 10 kt. Waves 1 ft.

MON
SE winds 5 to 10 kt...becoming S after midnight. Waves 1 ft.

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

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ANZ542-030800
Patuxent River to Broomes Island MD
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 kt. Waves less than 1 ft. A slight chance of showers and tstms.

THU
SW winds 5 kt. Waves less than 1 ft. A chance of showers.

THU NIGHT
SW winds around 5 kt. Waves 1 ft. A chance of showers and tstms.

FRI
NW winds around 5 kt. Waves 1 ft. Showers likely.

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

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

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

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

MON
SE winds around 5 kt. Waves 1 ft.

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

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ANZ534-030800
Chesapeake Bay from Drum Point to Smith Point
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 to 10 kt. Waves 1 ft. A slight chance of showers and tstms.

THU
S winds 5 to 10 kt. Waves 1 ft.

THU NIGHT
SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.

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

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

SAT
N winds 10 kt. Waves 2 ft.

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

SUN
NE winds 5 to 10 kt. Waves 1 to 2 ft.

MON
SE winds 5 to 10 kt...becoming S after midnight. Waves 1 to 2 ft.

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

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ANZ543-030800
Tangier Sound and the inland waters surrounding Bloodsworth Island
1057 PM EDT Wed Sep 2 2026

REST OF TONIGHT
SE winds 5 kt. Waves less than 1 ft. A chance of showers with a slight chance of tstms.

THU
S winds 5 to 10 kt. Waves 1 ft.

THU NIGHT
SW winds 5 to 10 kt. Waves 1 ft.

FRI
W winds 5 to 10 kt. Waves 1 ft. A chance of showers.

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

SAT
N winds 10 kt. Waves 1 ft.

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

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

MON
SE winds 5 to 10 kt...becoming S after midnight. Waves 1 ft.

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