National Weather Service Marine Forecast FZUS51 KLWX

FZUS51 KLWX 221201
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
801 AM EDT Tue Apr 22 2025

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.

ANZ500-222000
801 AM EDT Tue Apr 22 2025

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

A cold front will move over the waters this morning before slowly drifting off to the south. Weak high pressure builds in for the middle of the week before this front lifts northward across the area as a warm front on Friday. Boaters should be aware of the threats of boating in cold water, even when air temperatures are warm. Visit weather.gov/safety/coldwater for more information.

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ANZ535-222000
Tidal Potomac from Key Bridge to Indian Head
801 AM EDT Tue Apr 22 2025

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

TONIGHT
N winds around 5 kt. Waves 1 ft.

WED
NE winds around 5 kt. Waves 1 ft.

WED NIGHT
S winds around 5 kt. Waves 1 ft or less.

THU
SE winds around 5 kt. Waves 1 ft.

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

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

SAT
SW winds 5 to 10 kt...becoming NW. Waves 1 ft. Showers likely. A chance of tstms through the night, then a chance of showers after midnight.

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

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ANZ536-222000
Tidal Potomac from Indian Head to Cobb Island
801 AM EDT Tue Apr 22 2025

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

TONIGHT
N winds around 5 kt. Waves 1 ft.

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

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

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

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

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

SAT
SW winds 5 to 10 kt...becoming N after midnight. Waves 1 ft. Showers likely. A chance of tstms through the night, then a chance of showers after midnight.

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

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ANZ537-222000
Tidal Potomac from Cobb Island to Smith Point
801 AM EDT Tue Apr 22 2025

TODAY
NW winds 5 kt. Waves less than 1 ft. A slight chance of showers early this morning.

TONIGHT
NE winds around 5 kt. Waves flat.

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

WED NIGHT
SE winds around 5 kt. Waves flat.

THU
SE winds 5 to 10 kt. Waves 1 ft or less.

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

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

SAT
SW winds 10 kt...becoming N after midnight. Waves 1 ft. A chance of showers in the morning, then showers likely through the night. A chance of showers after midnight.

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ANZ530-222000
Chesapeake Bay north of Pooles Island
801 AM EDT Tue Apr 22 2025

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

TONIGHT
NW winds around 5 kt. Waves 1 ft.

WED
E winds around 5 kt. Waves 1 ft.

WED NIGHT
Light winds. Waves 1 ft or less.

THU
SE winds around 5 kt. Waves 1 ft.

THU NIGHT
S winds around 5 kt. Waves 1 ft.

FRI
S winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night. Showers likely after midnight.

SAT
SW winds 5 to 10 kt...becoming NW. Waves 1 ft. Showers likely. A chance of showers after midnight.

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ANZ531-222000
Chesapeake Bay from Pooles Island to Sandy Point
801 AM EDT Tue Apr 22 2025

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

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

WED
NE winds around 5 kt. Waves 1 ft or less.

WED NIGHT
S winds around 5 kt. Waves flat.

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

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

FRI
S winds 5 to 10 kt. Waves 1 ft or less. A chance of showers through the night. Showers likely after midnight.

SAT
SW winds 10 kt...becoming NW. Waves 1 ft. Showers likely. A chance of showers after midnight.

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ANZ538-222000
Patapsco River including Baltimore Harbor
801 AM EDT Tue Apr 22 2025

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

TONIGHT
NW winds 5 kt. Waves flat.

WED
E winds 5 kt. Waves flat.

WED NIGHT
S winds around 5 kt. Waves flat.

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

THU NIGHT
S winds around 5 kt. Waves 1 ft or less.

FRI
S winds 5 to 10 kt. Waves 1 ft or less. A chance of showers through the night. Showers likely after midnight.

SAT
SW winds 5 to 10 kt...becoming NW. Waves 1 ft. Showers likely. A chance of showers after midnight.

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ANZ539-222000
Chester River to Queenstown MD
801 AM EDT Tue Apr 22 2025

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

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

WED
N winds around 5 kt. Waves flat.

WED NIGHT
S winds around 5 kt. Waves flat.

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

THU NIGHT
S winds around 5 kt. Waves 1 ft or less.

FRI
S winds 5 to 10 kt. Waves 1 ft or less. A chance of showers through the night. Showers likely after midnight.

SAT
SW winds 10 kt...becoming NW. Waves 1 ft. Showers likely. A chance of showers after midnight.

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ANZ532-222000
Chesapeake Bay from Sandy Point to North Beach
801 AM EDT Tue Apr 22 2025

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

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

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

WED NIGHT
S winds around 5 kt. Waves flat.

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

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

FRI
S winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers through the night. Showers likely after midnight.

SAT
SW winds 10 kt...becoming NW. Waves 1 to 2 ft. Showers likely. A chance of showers after midnight.

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ANZ540-222000
Eastern Bay
801 AM EDT Tue Apr 22 2025

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

TONIGHT
N winds 5 kt. Waves flat.

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

WED NIGHT
S winds around 5 kt. Waves flat.

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

THU NIGHT
S winds 5 kt. Waves less than 1 ft.

FRI
S winds 5 to 10 kt. Waves 1 ft or less. A chance of showers through the night. Showers likely after midnight.

SAT
SW winds 10 kt...becoming NW. Waves 1 ft. Showers likely. A chance of showers after midnight.

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ANZ533-222000
Chesapeake Bay from North Beach to Drum Point
801 AM EDT Tue Apr 22 2025

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

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

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

WED NIGHT
S winds around 5 kt. Waves flat.

THU
SE winds 5 to 10 kt. Waves 1 ft or less.

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

FRI
S winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers.

SAT
SW winds 10 kt...becoming NW. Waves 1 to 2 ft. Showers likely. A chance of showers after midnight.

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ANZ541-222000
Choptank River to Cambridge MD and the Little Choptank River
801 AM EDT Tue Apr 22 2025

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

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

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

WED NIGHT
S winds around 5 kt. Waves flat.

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

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

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

SAT
SW winds 10 kt...becoming NW. Waves 1 ft. Showers likely. A chance of showers after midnight.

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ANZ542-222000
Patuxent River to Broomes Island MD
801 AM EDT Tue Apr 22 2025

TODAY
NW winds 5 kt. Waves less than 1 ft. A slight chance of showers early this morning.

TONIGHT
N winds around 5 kt. Waves 1 ft.

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

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

THU
SE winds around 5 kt. Waves 1 ft.

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

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

SAT
SW winds 5 to 10 kt...becoming N after midnight. Waves 1 ft. Showers likely. A chance of showers after midnight.

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ANZ534-222000
Chesapeake Bay from Drum Point to Smith Point
801 AM EDT Tue Apr 22 2025

TODAY
W winds 5 to 10 kt...becoming N this afternoon. Waves 1 ft. A chance of showers early this morning.

TONIGHT
NE winds around 5 kt. Waves 1 ft.

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

WED NIGHT
SE winds around 5 kt. Waves 1 ft or less.

THU
SE winds 5 to 10 kt. Waves 1 ft or less.

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

FRI
SE winds 10 to 15 kt...becoming S after midnight. Waves 1 to 2 ft. A chance of showers.

SAT
S winds 10 to 15 kt...becoming W in the evening, then becoming N after midnight. Waves 2 ft. A chance of showers in the morning, then showers likely through the night. A chance of showers after midnight.

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ANZ543-222000
Tangier Sound and the inland waters surrounding Bloodsworth Island
801 AM EDT Tue Apr 22 2025

TODAY
W winds 10 kt...becoming NW this afternoon. Waves 1 ft or less. A chance of showers early this morning.

TONIGHT
N winds around 5 kt. Waves flat.

WED
NE winds 5 to 10 kt...becoming SE late. Waves 1 ft.

WED NIGHT
SE winds around 5 kt. Waves flat.

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

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

FRI
SE winds 10 to 15 kt. Waves 1 ft. A chance of showers.

SAT
SW winds 10 to 15 kt...becoming N after midnight. Waves 1 ft. A chance of showers in the morning, then showers likely through the night. A chance of showers after midnight.