National Weather Service Marine Forecast FZUS51 KLWX

FZUS51 KLWX 120858
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
457 AM EDT Fri Jun 12 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.

ANZ500-122300
457 AM EDT Fri Jun 12 2026

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

A cold front brings potential for more widespread severe thunderstorms today into tonight. Small Craft Advisories may be needed in the wake of the front this evening into Saturday morning, and then again in southerly channeling on Sunday. Gusty winds and rain chances could return Sunday afternoon.

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ANZ535-122300
Tidal Potomac from Key Bridge to Indian Head
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
Light winds. Waves 1 ft.

TODAY
SW winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.

TONIGHT
W winds 5 kt. Waves less than 1 ft. Showers and tstms likely.

SAT
NW winds around 5 kt. Waves 1 ft.

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

SUN
S winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Showers likely with a chance of tstms.

SUN NIGHT
W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Showers likely with a chance of tstms.

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

TUE
S winds around 5 kt. Waves 1 ft. A chance of showers.

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

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ANZ536-122300
Tidal Potomac from Indian Head to Cobb Island
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
SW winds 5 kt. Waves flat.

TODAY
SW winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.

TONIGHT
W winds 5 to 10 kt...becoming NW late. Waves 1 ft. Showers with tstms likely.

SAT
NW winds around 5 kt. Waves 1 ft.

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

SUN
S winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Showers likely with a chance of tstms.

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

MON
N winds 5 to 10 kt. Waves 1 ft. A chance of showers after midnight.

TUE
SE winds around 5 kt. Waves 1 ft or less. A chance of showers.

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

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ANZ537-122300
Tidal Potomac from Cobb Island to Smith Point
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves flat.

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

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

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

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

SUN
S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers likely with a chance of tstms.

SUN NIGHT
S winds 10 to 15 kt...becoming NW after midnight. Gusts up to 20 kt. Waves 1 to 2 ft. Showers likely with a chance of tstms.

MON
N winds 5 to 10 kt...becoming E. Waves 1 ft. A chance of showers after midnight.

TUE
SE winds around 5 kt. Waves 1 ft. A chance of showers.

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

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ANZ530-122300
Chesapeake Bay north of Pooles Island
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves less than 1 ft.

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

TONIGHT
W winds 5 to 10 kt...becoming N late. Waves 1 ft. Showers likely with a chance of tstms.

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

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

SUN
S winds 10 to 15 kt. Gusts up to 25 kt in the afternoon. Waves 1 to 2 ft. Showers likely with a chance of tstms.

SUN NIGHT
S winds 10 to 15 kt...becoming NW after midnight. Gusts up to 20 kt. Waves 1 to 2 ft. Showers likely with a chance of tstms.

MON
NW winds 10 to 15 kt...diminishing to around 5 kt. Waves 1 ft or less.

TUE
SW winds around 5 kt. Waves 1 ft or less. A chance of showers through the night.

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

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ANZ531-122300
Chesapeake Bay from Pooles Island to Sandy Point
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves less than 1 ft.

TODAY
SW winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.

TONIGHT
SW winds 5 to 10 kt...becoming NW after midnight. Waves 1 ft. Showers and tstms likely.

SAT
N winds 5 to 10 kt...becoming SW in the afternoon. Waves 1 ft.

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

SUN
S winds 10 to 15 kt. Gusts up to 25 kt in the afternoon. Waves 1 to 2 ft. Showers likely with a chance of tstms.

SUN NIGHT
S winds 10 to 15 kt...becoming NW after midnight. Gusts up to 20 kt. Waves 2 ft. Showers likely with a chance of tstms.

MON
NW winds 10 to 15 kt...diminishing to around 5 kt. Waves 1 to 2 ft...subsiding to flat after midnight.

TUE
SW winds around 5 kt. Waves 1 ft or less. A chance of showers.

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

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ANZ538-122300
Patapsco River including Baltimore Harbor
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves flat.

TODAY
W winds 5 to 10 kt. Waves 1 ft or less. Showers and tstms likely.

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

SAT
NW winds 5 kt. Waves flat.

SAT NIGHT
S winds around 5 kt. Waves flat.

SUN
S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely with a chance of tstms.

SUN NIGHT
S winds 10 to 15 kt...becoming NW 5 to 10 kt after midnight. Gusts up to 20 kt. Waves 1 ft. Showers likely with a chance of tstms.

MON
NW winds 5 to 10 kt...becoming light. Waves 1 ft or less.

TUE
SW winds around 5 kt. Waves 1 ft or less. A chance of showers.

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

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ANZ539-122300
Chester River to Queenstown MD
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves less than 1 ft.

TODAY
SW winds 5 kt. Waves less than 1 ft. Showers and tstms likely.

TONIGHT
W winds 5 to 10 kt...becoming N late. Waves 1 ft. Showers and tstms likely.

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

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

SUN
S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers likely with a chance of tstms.

SUN NIGHT
S winds 10 to 15 kt...becoming NW after midnight. Gusts up to 20 kt. Waves 2 ft. Showers likely with a chance of tstms.

MON
NW winds 10 to 15 kt...diminishing to around 5 kt. Waves 1 to 2 ft...subsiding to flat after midnight. A chance of showers after midnight.

TUE
SW winds around 5 kt. Waves flat. A chance of showers.

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

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ANZ532-122300
Chesapeake Bay from Sandy Point to North Beach
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves less than 1 ft.

TODAY
SW winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.

TONIGHT
W winds 5 to 10 kt...becoming NW late. Waves 1 ft. Showers and tstms likely.

SAT
N winds 5 to 10 kt...becoming SW in the afternoon. Waves 1 ft or less.

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

SUN
S winds 5 to 10 kt...increasing to 15 to 20 kt with gusts to 25 kt in the afternoon. Waves 1 ft...building to 3 ft in the afternoon. Showers likely with a chance of tstms.

SUN NIGHT
S winds 10 to 15 kt with gusts to 25 kt... becoming NW after midnight. Waves 3 ft...subsiding to 1 ft after midnight. Showers likely with a chance of tstms.

MON
NW winds 10 to 15 kt...diminishing to 5 kt. Waves 1 to 2 ft... subsiding to flat after midnight. A chance of showers after midnight.

TUE
S winds 5 kt. Waves less than 1 ft. A chance of showers.

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

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ANZ540-122300
Eastern Bay
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves flat.

TODAY
SW winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely.

TONIGHT
W winds 5 to 10 kt...becoming N late. Waves 1 ft. Showers and tstms likely.

SAT
NW winds 5 to 10 kt. Waves 1 ft or less.

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

SUN
S winds 10 to 15 kt. Gusts up to 25 kt in the afternoon. Waves 1 to 2 ft. Showers likely with a chance of tstms.

SUN NIGHT
S winds 10 to 15 kt...becoming NW after midnight. Gusts up to 20 kt. Waves 1 to 2 ft. Showers likely with a chance of tstms.

MON
NW winds 10 to 15 kt...diminishing to around 5 kt. Waves 1 ft or less. A chance of showers after midnight.

TUE
S winds around 5 kt. Waves flat. A chance of showers.

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

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ANZ533-122300
Chesapeake Bay from North Beach to Drum Point
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves flat.

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

TONIGHT
W winds 5 to 10 kt...becoming NW late. Waves 1 ft. Showers likely with a chance of tstms.

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

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

SUN
S winds 5 to 10 kt...increasing to 15 to 20 kt with gusts to 25 kt in the afternoon. Waves 1 ft...building to 3 ft in the afternoon. Showers likely with a chance of tstms.

SUN NIGHT
S winds 15 to 20 kt with gusts to 25 kt... becoming NW 10 to 15 kt after midnight. Waves 2 to 3 ft. Showers likely with a chance of tstms.

MON
NW winds 10 to 15 kt...diminishing to 5 kt. Waves 1 to 2 ft. A chance of showers after midnight.

TUE
SE winds 5 kt. Waves less than 1 ft. A chance of showers.

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

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ANZ541-122300
Choptank River to Cambridge MD and the Little Choptank River
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves flat.

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

TONIGHT
W winds 5 to 10 kt...becoming NW late. Waves 1 ft. Showers likely with a chance of tstms.

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

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

SUN
S winds 5 to 10 kt...increasing to 15 to 20 kt with gusts to 25 kt in the afternoon. Waves 1 to 2 ft. Showers likely with a chance of tstms.

SUN NIGHT
S winds 10 to 15 kt...becoming NW after midnight. Gusts up to 20 kt. Waves 2 ft. Showers likely with a chance of tstms.

MON
NW winds 10 to 15 kt...diminishing to 5 kt. Waves 1 to 2 ft... subsiding to flat after midnight. A chance of showers after midnight.

TUE
S winds around 5 kt. Waves 1 ft or less. A chance of showers.

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

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ANZ542-122300
Patuxent River to Broomes Island MD
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves less than 1 ft.

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

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

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

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

SUN
S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely with a chance of tstms.

SUN NIGHT
S winds 5 to 10 kt...becoming NW after midnight. Gusts up to 20 kt. Waves 1 ft. Showers likely with a chance of tstms.

MON
N winds 5 to 10 kt. Waves 1 ft. A chance of showers after midnight.

TUE
SE winds around 5 kt. Waves 1 ft. A chance of showers.

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

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ANZ534-122300
Chesapeake Bay from Drum Point to Smith Point
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves less than 1 ft.

TODAY
SW winds 5 to 10 kt. Waves 1 ft. A chance of tstms.

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

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

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

SUN
S winds 10 to 15 kt. Gusts up to 25 kt in the afternoon. Waves 2 to 3 ft. Showers likely with a chance of tstms.

SUN NIGHT
S winds 10 to 15 kt...becoming NW after midnight. Gusts up to 20 kt. Waves 2 to 3 ft. Showers likely with a chance of tstms.

MON
N winds 10 to 15 kt...becoming E 5 kt. Waves 1 to 2 ft. A chance of showers after midnight.

TUE
SE 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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ANZ543-122300
Tangier Sound and the inland waters surrounding Bloodsworth Island
457 AM EDT Fri Jun 12 2026

REST OF THE OVERNIGHT
W winds 5 kt. Waves less than 1 ft. A slight chance of showers.

TODAY
SW winds 5 to 10 kt. Waves 1 ft. A chance of tstms.

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

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

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

SUN
S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers likely with a chance of tstms.

SUN NIGHT
S winds 15 kt...becoming NW after midnight. Gusts up to 20 kt. Waves 2 ft. Showers likely with a chance of tstms.

MON
NW winds 10 to 15 kt...becoming NE 5 kt. Waves 1 to 2 ft... subsiding to 1 ft or less. A chance of showers after midnight.

TUE
E winds 5 to 10 kt. Waves 1 ft. A chance of showers.

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