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National Weather Service Marine Forecast FZUS51 KBOX

FZUS51 KBOX 250903
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
403 AM EST Wed Feb 25 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM

ANZ200-252200
403 AM EST Wed Feb 25 2026

Synopsis for Massachusetts and Rhode Island coastal waters

A weak ridge moves across the waters overnight. A weaker low will pass north of the region Wednesday, followed by another weak low tracking to the south of the region late Thursday into Friday.

ANZ250-252200
Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING

TODAY
S winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 5 ft. Wave Detail: S 5 ft at 4 seconds and SE 3 ft at 10 seconds. Snow likely. A chance of rain this afternoon.

TONIGHT
SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 6 seconds.

THU
W winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and SE 2 ft at 10 seconds.

THU NIGHT
NW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: W 3 ft at 4 seconds and SE 2 ft at 10 seconds.

FRI AND FRI NIGHT
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NW 2 ft at 3 seconds and SE 2 ft at 9 seconds.

SAT THROUGH SUN
NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 2 ft at 8 seconds.

SUN NIGHT
NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of light freezing spray.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ251-252200
Massachusetts Bay and Ipswich Bay
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING

TODAY
S winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and E 2 ft at 9 seconds. Snow. A slight chance of rain this afternoon.

TONIGHT
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 8 seconds.

THU
W winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas around 2 ft. Wave Detail: W 2 ft at 3 seconds and E 1 foot at 10 seconds.

THU NIGHT
NW winds around 10 kt. Seas around 2 ft. Wave Detail: W 2 ft at 3 seconds and SE 1 foot at 11 seconds.

FRI AND FRI NIGHT
SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and E 1 foot at 9 seconds.

SAT THROUGH SUN
NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and E 1 foot at 8 seconds.

SUN NIGHT
NW winds 15 to 20 kt. Seas 2 to 4 ft. A chance of light freezing spray.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ231-252200
Cape Cod Bay
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING

TODAY
S winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 5 seconds and NE 2 ft at 8 seconds. Snow likely this morning. Rain with a chance of snow this afternoon.

TONIGHT
SW winds 10 to 15 kt with gusts up to 25 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 7 seconds.

THU
W winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 10 seconds and W 1 foot at 3 seconds.

THU NIGHT
NW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: NW 1 foot at 4 seconds and S 1 foot at 10 seconds.

FRI
NW winds 5 to 10 kt, becoming SW in the afternoon. Seas 1 foot or less. Wave Detail: NW 1 foot at 3 seconds and S 1 foot at 9 seconds.

FRI NIGHT
SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: W 1 foot at 3 seconds and NE 1 foot at 7 seconds.

SAT THROUGH SUN
NW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft.

SUN NIGHT
NW winds 15 to 20 kt. Seas 2 to 4 ft. A chance of light freezing spray.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ254-252200
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY EVENING

TODAY
SW winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 4 ft, building to 4 to 6 ft this afternoon. Wave Detail: SW 4 ft at 5 seconds and E 3 ft at 9 seconds, becoming SW 5 ft at 5 seconds and E 3 ft at 10 seconds. A chance of rain and snow this morning, then rain likely this afternoon.

TONIGHT
SW winds 15 to 20 kt. Gusts up to 30 kt, decreasing to 20 kt after midnight. Seas 4 to 6 ft. Wave Detail: S 5 ft at 9 seconds and W 4 ft at 5 seconds.

THU
W winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas 4 to 6 ft. Wave Detail: S 5 ft at 10 seconds and W 2 ft at 4 seconds.

THU NIGHT
NW winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: S 4 ft at 9 seconds and NW 2 ft at 4 seconds.

FRI
NW winds 5 to 10 kt, becoming W in the afternoon. Seas 2 to 4 ft. Wave Detail: S 4 ft at 9 seconds and NW 1 foot at 4 seconds.

FRI NIGHT
S winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 9 seconds and NW 1 foot at 4 seconds.

SAT THROUGH SUN
NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.

SUN NIGHT
N winds 15 to 20 kt. Seas 3 to 5 ft. A chance of light freezing spray.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ255-252200
Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY EVENING

TODAY
SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft, building to 5 to 8 ft this afternoon. Wave Detail: SW 4 ft at 6 seconds and E 2 ft at 10 seconds, becoming E 7 ft at 11 seconds and SW 6 ft at 7 seconds. A chance of rain. A slight chance of snow this morning.

TONIGHT
SW winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 8 ft. Wave Detail: SW 7 ft at 9 seconds and W 1 foot at 5 seconds.

THU
W winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas 5 to 7 ft. Wave Detail: SW 6 ft at 9 seconds and W 1 foot at 3 seconds.

THU NIGHT
NW winds around 10 kt. Seas 3 to 5 ft. Wave Detail: S 5 ft at 9 seconds. A chance of snow in the evening.

FRI
N winds 5 to 10 kt, becoming W in the afternoon. Seas 3 to 4 ft. Wave Detail: S 4 ft at 9 seconds.

FRI NIGHT
S winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 9 seconds.

SAT THROUGH SUN
NW winds 10 to 15 kt. Seas 2 to 3 ft.

SUN NIGHT
N winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of light freezing spray.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ256-252200
Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY EVENING

TODAY
SW winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft, building to 6 to 9 ft this afternoon. Wave Detail: SW 6 ft at 6 seconds and E 1 foot at 11 seconds, becoming SW 7 ft at 7 seconds and SE 7 ft at 12 seconds. A chance of rain with a slight chance of snow this morning, then rain likely this afternoon.

TONIGHT
SW winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 9 ft. Wave Detail: SW 8 ft at 8 seconds and SW 1 foot at 4 seconds.

THU
W winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas 5 to 7 ft. Wave Detail: SW 6 ft at 9 seconds.

THU NIGHT
NW winds around 10 kt. Seas 4 to 6 ft. Wave Detail: S 5 ft at 9 seconds.

FRI
N winds 5 to 10 kt, becoming W in the afternoon. Seas 3 to 4 ft. Wave Detail: S 4 ft at 9 seconds.

FRI NIGHT
S winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 9 seconds.

SAT THROUGH SUN
NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.

SUN NIGHT
N winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of light freezing spray.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ232-252200
Nantucket Sound
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT

TODAY
SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 3 ft, building to 3 to 5 ft this afternoon. Wave Detail: SW 3 ft at 4 seconds and E 1 foot at 10 seconds. Rain likely. A chance of snow this morning.

TONIGHT
SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and S 2 ft at 9 seconds.

THU
W winds around 10 kt. Seas 2 to 4 ft. Wave Detail: W 2 ft at 3 seconds and S 2 ft at 9 seconds.

THU NIGHT
NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at 9 seconds and W 1 foot at 3 seconds.

FRI
NW winds 5 to 10 kt, becoming W in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 9 seconds and NW 1 foot at 3 seconds.

FRI NIGHT
SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 9 seconds and W 1 foot at 2 seconds.

SAT THROUGH SUN NIGHT
N winds 15 to 20 kt. Seas 2 to 3 ft.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ233-252200
Vineyard Sound
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT

TODAY
SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft, building to 4 to 6 ft this afternoon. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 10 seconds, becoming SW 5 ft at 7 seconds and SE 5 ft at 12 seconds. Rain. A chance of snow this morning.

TONIGHT
SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: SW 5 ft at 7 seconds.

THU
W winds around 10 kt. Seas 3 to 5 ft. Wave Detail: SW 4 ft at 9 seconds and W 1 foot at 4 seconds.

THU NIGHT
NW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 9 seconds and W 1 foot at 4 seconds.

FRI
NW winds 5 to 10 kt, becoming W in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 9 seconds and NW 1 foot at 3 seconds.

FRI NIGHT
S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 9 seconds and W 1 foot at 2 seconds.

SAT THROUGH SUN NIGHT
N winds 15 to 20 kt. Seas 2 to 3 ft.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ234-252200
Buzzards Bay
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT

TODAY
SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 4 ft at 6 seconds and SE 3 ft at 11 seconds. Rain with a chance of snow.

TONIGHT
SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 7 seconds.

THU
W winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 9 seconds and W 1 foot at 4 seconds.

THU NIGHT
NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 9 seconds and W 1 foot at 4 seconds.

FRI
NW winds around 5 kt, becoming SW in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 9 seconds and NW 1 foot at 3 seconds.

FRI NIGHT
SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 9 seconds and SW 1 foot at 3 seconds.

SAT THROUGH SUN NIGHT
N winds 15 to 20 kt. Seas around 2 ft.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ235-252200
Rhode Island Sound
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY EVENING

TODAY
SW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft, building to 5 to 7 ft this afternoon. Wave Detail: SW 5 ft at 5 seconds and SE 1 foot at 10 seconds, becoming SW 7 ft at 7 seconds and S 6 ft at 14 seconds. Rain. A chance of snow this morning.

TONIGHT
SW winds 15 to 20 kt, becoming W 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 5 to 7 ft. Wave Detail: SW 6 ft at 8 seconds and SW 2 ft at 5 seconds.

THU
W winds 10 to 15 kt. Seas 4 to 6 ft. Wave Detail: S 5 ft at 9 seconds and W 1 foot at 3 seconds.

THU NIGHT
NW winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: S 5 ft at 9 seconds.

FRI
N winds 5 to 10 kt, becoming W in the afternoon. Seas 2 to 4 ft. Wave Detail: S 4 ft at 9 seconds.

FRI NIGHT
SW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 9 seconds.

SAT THROUGH SUN
NW winds 10 to 15 kt. Seas 2 to 3 ft.

SUN NIGHT
N winds 15 to 20 kt. Seas 2 to 3 ft. A chance of light freezing spray.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ237-252200
Block Island Sound
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY EVENING

TODAY
SW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: SW 5 ft at 5 seconds and S 5 ft at 11 seconds. Rain. Snow this morning, then a chance of snow this afternoon.

TONIGHT
SW winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: S 5 ft at 8 seconds and W 2 ft at 4 seconds.

THU
W winds around 10 kt. Seas 3 to 5 ft. Wave Detail: S 4 ft at 9 seconds and W 1 foot at 3 seconds.

THU NIGHT
NW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 9 seconds.

FRI
N winds 5 to 10 kt, becoming W in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 9 seconds.

FRI NIGHT
SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 9 seconds.

SAT THROUGH SUN NIGHT
N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ230-252200
Boston Harbor
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM EST THIS AFTERNOON

TODAY
S winds 15 to 20 kt, becoming SW 10 to 15 kt this afternoon. Gusts up to 25 kt. Waves around 2 ft. Snow.

TONIGHT
SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft.

THU
W winds 10 to 15 kt. Gusts up to 20 kt in the morning. Waves around 2 ft.

THU NIGHT
NW winds 5 to 10 kt. Waves 1 foot or less.

FRI AND FRI NIGHT
SW winds 5 to 10 kt. Waves 1 foot or less.

SAT THROUGH SUN NIGHT
NW winds 15 to 20 kt. Waves around 2 ft.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

ANZ236-252200
Narragansett Bay
403 AM EST Wed Feb 25 2026

SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING

TODAY
SW winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 4 ft. Snow with a chance of rain.

TONIGHT
SW winds 10 to 15 kt with gusts up to 25 kt, becoming W 5 to 10 kt after midnight. Waves 2 to 4 ft.

THU
W winds 5 to 10 kt. Waves 2 to 3 ft.

THU NIGHT
NW winds around 5 kt. Waves 2 to 3 ft.

FRI AND FRI NIGHT
SW winds 5 to 10 kt. Waves around 2 ft.

SAT THROUGH SUN NIGHT
N winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft.

Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.

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