National Weather Service Marine Forecast FZUS51 KLWX

FZUS51 KLWX 192057
CWFLWX

Coastal Waters Forecast
National Weather Service Baltimore MD/Washington DC
457 PM EDT Thu Mar 19 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.

ANZ500-200800
457 PM EDT Thu Mar 19 2026

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

High pressure will remain in place through Friday afternoon before a quick moving clipper system tracks across the waters by Friday night. Another cold front pushes through the region late in the weekend before high pressure approaches from the west early next week. Small Craft Advisories may be needed Saturday, and again Sunday into Monday.

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ANZ535-200800
Tidal Potomac from Key Bridge to Indian Head
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
SW winds 5 kt. Waves less than 1 ft.

TONIGHT
S winds around 5 kt. Waves 1 ft.

FRI
S winds 5 to 10 kt. Gusts up to 25 kt in the afternoon. Waves 1 ft. Scattered showers.

FRI NIGHT
SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Numerous showers.

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

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

SUN
S winds 5 to 10 kt. Waves 1 ft. A chance of rain after midnight.

MON
NW winds 10 to 15 kt. Waves 1 ft. A chance of rain in the morning.

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ANZ536-200800
Tidal Potomac from Indian Head to Cobb Island
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
S winds 5 kt. Waves less than 1 ft.

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

FRI
S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.

FRI NIGHT
SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Numerous showers.

SAT
NW winds 5 kt. Waves less than 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 ft. A chance of rain after midnight.

MON
NW winds 10 to 15 kt. Waves 1 to 2 ft. A chance of rain in the morning.

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ANZ537-200800
Tidal Potomac from Cobb Island to Smith Point
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
SE winds 10 kt. Waves 1 ft.

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

FRI
S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.

FRI NIGHT
SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Numerous showers.

SAT
NW 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 15 to 20 kt after midnight. Waves 1 to 2 ft.

MON
NW winds 15 to 20 kt...becoming N. Waves 2 to 3 ft.

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ANZ530-200800
Chesapeake Bay north of Pooles Island
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
SW winds 5 kt. Waves less than 1 ft.

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

FRI
S winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft. Scattered showers.

FRI NIGHT
SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Numerous showers.

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

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

SUN
S winds 10 to 15 kt. Waves 1 ft. A chance of rain after midnight.

MON
NW winds 10 to 15 kt. Waves 1 to 2 ft. A chance of rain in the morning.

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ANZ531-200800
Chesapeake Bay from Pooles Island to Sandy Point
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM EDT THIS EVENING

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
S winds 15 kt with gusts to 20 kt. Waves 2 ft.

TONIGHT
S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 to 2 ft.

FRI
S winds 10 to 15 kt with gusts to 25 kt. Waves 1 to 2 ft. Scattered showers.

FRI NIGHT
SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Numerous showers.

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

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

SUN
S winds 10 to 15 kt...becoming SW 15 to 20 kt after midnight. Waves 1 to 2 ft. A chance of rain after midnight.

MON
NW winds 15 to 20 kt. Waves 2 to 3 ft. A chance of rain in the morning.

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ANZ538-200800
Patapsco River including Baltimore Harbor
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM EDT THIS EVENING

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
S winds 15 kt with gusts to 20 kt. Waves 1 ft.

TONIGHT
S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft or less.

FRI
S winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft or less. Scattered showers.

FRI NIGHT
SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Numerous showers.

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

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

SUN
S winds 5 to 10 kt. Waves 1 ft. A chance of rain after midnight.

MON
NW winds 10 to 15 kt. Waves 1 ft. A chance of rain in the morning.

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ANZ539-200800
Chester River to Queenstown MD
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
S winds 5 kt. Waves less than 1 ft.

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

FRI
S winds 10 to 15 kt with gusts to 25 kt. Waves 1 to 2 ft. Scattered showers.

FRI NIGHT
SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Numerous showers.

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

SAT NIGHT
E 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 rain after midnight.

MON
NW winds 15 to 20 kt. Waves 2 to 3 ft. A chance of rain in the morning.

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ANZ532-200800
Chesapeake Bay from Sandy Point to North Beach
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM EDT THIS EVENING

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
S winds 15 kt with gusts to 20 kt. Waves 2 ft.

TONIGHT
S winds 5 to 10 kt. Gusts up to 25 kt. Waves 1 to 2 ft.

FRI
S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft... building to 3 ft in the afternoon. Scattered showers.

FRI NIGHT
SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. Numerous showers.

SAT
N 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 15 to 20 kt after midnight. Waves 1 to 2 ft. A chance of rain after midnight.

MON
NW winds 15 to 20 kt. Waves 2 to 3 ft. A chance of rain in the morning.

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ANZ540-200800
Eastern Bay
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
S winds 10 kt. Waves 1 ft.

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

FRI
S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Scattered showers.

FRI NIGHT
SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Numerous showers.

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

SAT NIGHT
SE winds around 5 kt. Waves flat.

SUN
S winds 10 to 15 kt...becoming SW 15 to 20 kt after midnight. Waves 1 to 2 ft. A chance of rain after midnight.

MON
NW winds 15 to 20 kt. Waves 2 ft. A chance of rain in the morning.

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ANZ533-200800
Chesapeake Bay from North Beach to Drum Point
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM EDT THIS EVENING

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
SE winds 15 kt with gusts to 20 kt. Waves 2 ft.

TONIGHT
S winds 10 to 15 kt. Gusts up to 20 kt until early morning. Waves 1 to 2 ft.

FRI
S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.

FRI NIGHT
SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Numerous showers.

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

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

SUN
S winds 5 to 10 kt...increasing to 15 to 20 kt. Waves 1 to 2 ft. A chance of rain after midnight.

MON
NW winds 15 to 20 kt. Waves 3 ft. A chance of rain in the morning.

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ANZ541-200800
Choptank River to Cambridge MD and the Little Choptank River
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
S winds 10 kt. Waves 1 ft.

TONIGHT
S winds 5 to 10 kt. Gusts up to 20 kt until early morning. Waves 1 ft.

FRI
S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.

FRI NIGHT
SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Numerous showers.

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

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

SUN
S winds 5 to 10 kt...increasing to 15 to 20 kt. Waves 1 to 2 ft. A chance of rain after midnight.

MON
NW winds 15 to 20 kt. Waves 2 to 3 ft. A chance of rain in the morning.

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ANZ542-200800
Patuxent River to Broomes Island MD
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
SE winds 10 kt. Waves 1 ft.

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

FRI
S winds 5 to 10 kt. Gusts up to 20 kt in the late morning and afternoon. Waves 1 ft.

FRI NIGHT
SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Numerous showers.

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

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

SUN
S winds 5 to 10 kt. Waves 1 ft. A chance of rain after midnight.

MON
NW winds 10 to 15 kt...becoming N after midnight. Waves 1 ft.

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ANZ534-200800
Chesapeake Bay from Drum Point to Smith Point
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM EDT THIS EVENING

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
SE winds 10 kt with gusts to 20 kt. Waves 2 ft.

TONIGHT
S winds 5 to 10 kt with gusts to 20 kt. Waves 2 ft.

FRI
S winds 15 to 20 kt with gusts to 25 kt. Waves 1 ft... building to 3 ft in the afternoon.

FRI NIGHT
SW winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. Numerous showers.

SAT
NW winds 5 to 10 kt. Waves 1 to 2 ft.

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

SUN
S winds 5 to 10 kt...increasing to 15 to 20 kt. Waves 1 to 2 ft...building to 3 ft after midnight.

MON
NW winds 15 to 20 kt...becoming N 20 to 25 kt. Waves 3 ft.

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ANZ543-200800
Tangier Sound and the inland waters surrounding Bloodsworth Island
457 PM EDT Thu Mar 19 2026

SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT

REST OF THIS AFTERNOON
S winds 5 kt. Waves less than 1 ft.

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

FRI
S winds 15 to 20 kt with gusts to 25 kt. Waves 1 to 2 ft.

FRI NIGHT
S winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. Numerous showers.

SAT
NW 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 15 to 20 kt after midnight. Waves 1 to 2 ft.

MON
NW winds 15 to 20 kt...becoming N. Waves 2 ft.