National Weather Service Marine Forecast FZUS51 KLWX

FZUS51 KLWX 230858
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
458 AM EDT Thu Jul 23 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.

ANZ500-232300
458 AM EDT Thu Jul 23 2026

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

High pressure will build in from the west through Friday before moving off the New England coast this weekend. The next frontal system may approach by early next week.

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ANZ535-232300
Tidal Potomac from Key Bridge to Indian Head
458 AM EDT Thu Jul 23 2026

REST OF THE OVERNIGHT
N winds 10 kt. Waves 1 ft.

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

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

FRI
E winds around 5 kt. Waves 1 ft.

FRI NIGHT
E winds around 5 kt. Waves 1 ft or less.

SAT
E winds around 5 kt. Waves 1 ft.

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

SUN
S winds around 5 kt. Waves 1 ft.

MON
SW 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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ANZ536-232300
Tidal Potomac from Indian Head to Cobb Island
458 AM EDT Thu Jul 23 2026

REST OF THE OVERNIGHT
N winds 10 kt. Waves 1 ft.

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

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

FRI
E winds around 5 kt. Waves 1 ft.

FRI NIGHT
E winds around 5 kt. Waves 1 ft.

SAT
E winds around 5 kt. Waves 1 ft.

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

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

MON
SW winds around 5 kt. Waves 1 ft.

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ANZ537-232300
Tidal Potomac from Cobb Island to Smith Point
458 AM EDT Thu Jul 23 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING

REST OF THE OVERNIGHT
N winds 15 kt with gusts to 20 kt. Waves 2 ft. A slight chance of showers.

TODAY
N winds 10 to 15 kt. Gusts up to 20 kt until late afternoon. Waves 1 to 2 ft. A chance of showers.

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

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

FRI NIGHT
E winds 5 to 10 kt. Waves 1 ft.

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

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

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

MON
SW winds 5 to 10 kt. Waves 1 ft or less.

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ANZ530-232300
Chesapeake Bay north of Pooles Island
458 AM EDT Thu Jul 23 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING

REST OF THE OVERNIGHT
N winds 10 kt with gusts to 20 kt. Waves 1 ft.

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

TONIGHT
NE winds around 5 kt. Waves flat.

FRI
E winds around 5 kt. Waves flat.

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

SAT
E winds around 5 kt. Waves flat.

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

SUN
S winds around 5 kt. Waves flat.

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

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

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ANZ531-232300
Chesapeake Bay from Pooles Island to Sandy Point
458 AM EDT Thu Jul 23 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING

REST OF THE OVERNIGHT
N winds 15 kt with gusts to 20 kt. Waves 2 ft.

TODAY
N winds 10 to 15 kt...becoming NE 5 kt late. Waves 1 to 2 ft.

TONIGHT
E winds around 5 kt. Waves flat.

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

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

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

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

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

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

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

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ANZ538-232300
Patapsco River including Baltimore Harbor
458 AM EDT Thu Jul 23 2026

REST OF THE OVERNIGHT
N winds 10 kt. Waves 1 ft.

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

TONIGHT
NE winds around 5 kt. Waves flat.

FRI
E winds around 5 kt. Waves 1 ft or less.

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

SAT
E winds around 5 kt. Waves flat.

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

SUN
S winds around 5 kt. Waves flat.

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

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

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ANZ539-232300
Chester River to Queenstown MD
458 AM EDT Thu Jul 23 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING

REST OF THE OVERNIGHT
N winds 15 kt with gusts to 20 kt. Waves 2 ft.

TODAY
N winds 5 to 10 kt. Waves 1 to 2 ft.

TONIGHT
E winds around 5 kt. Waves flat.

FRI
E winds 5 kt. Waves flat.

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

SAT
E winds 5 kt. Waves flat.

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

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

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

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

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ANZ532-232300
Chesapeake Bay from Sandy Point to North Beach
458 AM EDT Thu Jul 23 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING

REST OF THE OVERNIGHT
N winds 15 kt with gusts to 20 kt. Waves 2 ft.

TODAY
N winds 10 to 15 kt with gusts to 20 kt... becoming NE 5 kt late. Waves 1 to 2 ft.

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

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

FRI NIGHT
E winds 5 to 10 kt. Waves 1 ft.

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

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

SUN
SE winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft or less.

MON
SW winds 5 to 10 kt. Waves 1 to 2 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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ANZ540-232300
Eastern Bay
458 AM EDT Thu Jul 23 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING

REST OF THE OVERNIGHT
N winds 15 kt with gusts to 20 kt. Waves 1 ft.

TODAY
N winds 10 to 15 kt with gusts to 20 kt... diminishing to 5 kt late. Waves 1 ft.

TONIGHT
E winds around 5 kt. Waves flat.

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

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

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

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

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

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

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

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ANZ533-232300
Chesapeake Bay from North Beach to Drum Point
458 AM EDT Thu Jul 23 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING

REST OF THE OVERNIGHT
N winds 15 kt with gusts to 20 kt. Waves 3 ft.

TODAY
N winds 10 to 15 kt. Gusts up to 20 kt until late afternoon. Waves 2 to 3 ft.

TONIGHT
NE winds 5 to 10 kt...becoming E after midnight. Waves 1 ft.

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

FRI NIGHT
E winds 5 to 10 kt. Waves 1 ft.

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

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

SUN
SE winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft or less.

MON
SW winds 10 to 15 kt. Waves 1 to 2 ft.

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ANZ541-232300
Choptank River to Cambridge MD and the Little Choptank River
458 AM EDT Thu Jul 23 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING

REST OF THE OVERNIGHT
N winds 15 kt with gusts to 20 kt. Waves 2 ft.

TODAY
N winds 10 to 15 kt. Gusts up to 20 kt until late afternoon. Waves 1 to 2 ft.

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

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

FRI NIGHT
E winds 5 to 10 kt. Waves 1 ft.

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

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

SUN
SE winds 5 to 10 kt...becoming SW after midnight. Waves 1 ft or less.

MON
SW 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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ANZ542-232300
Patuxent River to Broomes Island MD
458 AM EDT Thu Jul 23 2026

REST OF THE OVERNIGHT
N winds 10 kt with gusts to 20 kt. Waves 1 ft. A slight chance of showers.

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

TONIGHT
NE winds around 5 kt. Waves 1 ft.

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

FRI NIGHT
E winds 5 to 10 kt. Waves 1 ft.

SAT
E winds around 5 kt. Waves 1 ft.

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

SUN
SE winds around 5 kt. Waves 1 ft.

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

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ANZ534-232300
Chesapeake Bay from Drum Point to Smith Point
458 AM EDT Thu Jul 23 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING

REST OF THE OVERNIGHT
N winds 15 kt with gusts to 20 kt. Waves 2 ft. A slight chance of showers.

TODAY
N winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.

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

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

FRI NIGHT
E winds 5 to 10 kt. Waves 1 ft.

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

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

SUN
E winds 5 kt...becoming S. Waves 1 ft or less.

MON
SW winds 10 to 15 kt. Waves 1 to 2 ft.

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ANZ543-232300
Tangier Sound and the inland waters surrounding Bloodsworth Island
458 AM EDT Thu Jul 23 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING

REST OF THE OVERNIGHT
N winds 15 kt with gusts to 20 kt. Waves 1 ft. A chance of showers.

TODAY
N winds 10 to 15 kt. Gusts up to 20 kt until late afternoon. Waves 1 ft.

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

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

FRI NIGHT
E winds 5 to 10 kt. Waves 1 ft.

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

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

SUN
SE winds 5 kt...becoming S. Waves 1 ft or less.

MON
SW winds 10 to 15 kt. Waves 1 to 2 ft.