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National Weather Service Marine Forecast FZUS51 KBOX

FZUS51 KBOX 040904
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
404 AM EST Wed Feb 4 2026

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

ANZ200-042200
404 AM EST Wed Feb 4 2026

Synopsis for Massachusetts and Rhode Island coastal waters

Rather quiet conditions through Fri with high pres building into the region. A quick moving low pressure system Fri night into early Sat is followed up with an Arctic cold front, bringing the threat of Gale or Storm Force winds this weekend and moderate to heavy freezing spray for all the waters.

ANZ250-042200
Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary
404 AM EST Wed Feb 4 2026

TODAY
W winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: NW 3 ft at 4 seconds and E 2 ft at 10 seconds.

TONIGHT
NW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 2 to 3 ft. Wave Detail: NW 3 ft at 4 seconds and E 1 foot at 10 seconds.

THU
NW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 13 seconds.

THU NIGHT
N winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 12 seconds.

FRI
NE winds around 10 kt, becoming E in the afternoon. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 11 seconds.

FRI NIGHT
S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 4 seconds and SW 1 foot at 2 seconds. A chance of snow after midnight.

SAT
NW winds 30 to 35 kt with gusts up to 40 kt. Seas 5 to 7 ft. Light freezing spray. Snow likely.

SAT NIGHT
NW winds 30 to 40 kt with gusts up to 45 kt. Seas 9 to 13 ft. Freezing spray. Snow likely.

SUN
NW winds 25 to 30 kt with gusts up to 35 kt. Seas 7 to 10 ft. Freezing spray.

SUN NIGHT
NW winds 20 to 25 kt. Seas 5 to 7 ft. 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.

ANZ251-042200
Massachusetts Bay and Ipswich Bay
404 AM EST Wed Feb 4 2026

TODAY
W winds 10 to 15 kt, becoming NW 15 to 20 kt this afternoon. Seas around 2 ft. Wave Detail: NW 2 ft at 4 seconds and NE 1 foot at 4 seconds.

TONIGHT
NW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 10 seconds.

THU
NW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 11 seconds.

THU NIGHT
N winds 10 to 15 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 13 seconds.

FRI
NE winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 12 seconds.

FRI NIGHT
S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 5 seconds and S 1 foot at 2 seconds. A chance of snow.

SAT
NW winds 35 to 40 kt. Seas 3 to 5 ft. Light freezing spray. Snow likely.

SAT NIGHT
NW winds 30 to 40 kt with gusts up to 45 kt. Seas 5 to 7 ft. Heavy freezing spray. A chance of snow.

SUN
NW winds 25 to 30 kt with gusts up to 35 kt. Seas 4 to 6 ft. Freezing spray.

SUN NIGHT
NW winds 20 to 25 kt. Seas 3 to 5 ft. 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.

ANZ231-042200
Cape Cod Bay
404 AM EST Wed Feb 4 2026

TODAY
W winds 10 to 15 kt, becoming NW 15 to 20 kt this afternoon. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 10 seconds.

TONIGHT
NW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 10 seconds.

THU
NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 12 seconds.

THU NIGHT
N winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 12 seconds.

FRI
NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 1 foot at 4 seconds and E 1 foot at 11 seconds.

FRI NIGHT
S winds around 5 kt. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: N 1 foot at 4 seconds and E 1 foot at 11 seconds, becoming SW 1 foot at 3 seconds and NE 1 foot at 5 seconds. A chance of snow after midnight.

SAT
NW winds 35 to 40 kt. Seas 3 to 5 ft. Light freezing spray. Snow likely.

SAT NIGHT
NW winds 30 to 40 kt with gusts up to 45 kt. Seas 6 to 9 ft. Heavy freezing spray. Snow likely.

SUN
NW winds 25 to 35 kt. Seas 6 to 9 ft. Freezing spray.

SUN NIGHT
NW winds 20 to 25 kt. Seas 4 to 6 ft. 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.

ANZ254-042200
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm
404 AM EST Wed Feb 4 2026

TODAY
W winds 10 to 15 kt, increasing to 15 to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: NW 3 ft at 4 seconds and E 2 ft at 10 seconds.

TONIGHT
NW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: NW 3 ft at 5 seconds and E 2 ft at 11 seconds.

THU
NW winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: N 2 ft at 5 seconds and E 1 foot at 13 seconds.

THU NIGHT
N winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 5 seconds and E 1 foot at 12 seconds.

FRI
NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 5 seconds and E 1 foot at 11 seconds.

FRI NIGHT
SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 5 seconds and SW 1 foot at 5 seconds. A chance of snow after midnight.

SAT
NW winds 30 to 35 kt with gusts up to 40 kt. Seas 5 to 7 ft. Snow likely.

SAT NIGHT
NW winds 35 to 45 kt with gusts up to 50 kt. Seas 9 to 13 ft. Freezing spray. Snow likely.

SUN
NW winds 25 to 35 kt. Seas 9 to 13 ft. Freezing spray. A chance of snow.

SUN NIGHT
NW winds 20 to 25 kt. Seas 5 to 8 ft. 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.

ANZ255-042200
Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket
404 AM EST Wed Feb 4 2026

TODAY
W winds 10 to 15 kt, becoming NW 15 to 20 kt this afternoon. Seas 3 to 4 ft. Wave Detail: W 4 ft at 5 seconds and E 2 ft at 10 seconds.

TONIGHT
NW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: W 3 ft at 5 seconds and E 1 foot at 11 seconds.

THU
NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 5 seconds and E 1 foot at 13 seconds.

THU NIGHT
N winds around 10 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 3 seconds and W 2 ft at 5 seconds.

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

FRI NIGHT
SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 1 foot at 5 seconds and E 1 foot at 5 seconds. A chance of snow after midnight.

SAT
NW winds 35 to 40 kt with gusts up to 45 kt. Seas 5 to 8 ft. Light freezing spray. Snow likely.

SAT NIGHT
NW winds 35 to 45 kt with gusts up to 50 kt. Seas 9 to 13 ft. Heavy freezing spray. Snow likely.

SUN
NW winds 30 to 40 kt. Seas 7 to 10 ft. Freezing spray.

SUN NIGHT
NW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 8 ft. 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.

ANZ256-042200
Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island
404 AM EST Wed Feb 4 2026

TODAY
NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: W 3 ft at 5 seconds and E 1 foot at 10 seconds.

TONIGHT
N winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and E 1 foot at 10 seconds.

THU
N winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 13 seconds.

THU NIGHT
N winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 3 seconds and W 2 ft at 5 seconds.

FRI
N winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 3 seconds and SW 1 foot at 5 seconds.

FRI NIGHT
SW winds 5 to 10 kt, becoming W 10 to 15 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 3 seconds. A chance of snow after midnight.

SAT
NW winds 30 to 40 kt with gusts up to 45 kt. Seas 6 to 9 ft. Light freezing spray. Snow likely.

SAT NIGHT
NW winds 35 to 45 kt with gusts up to 50 kt. Seas 8 to 11 ft. Heavy freezing spray. A chance of snow.

SUN
NW winds 25 to 35 kt with gusts up to 40 kt. Seas 6 to 9 ft. Freezing spray.

SUN NIGHT
NW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. 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.

ANZ232-042200
Nantucket Sound
404 AM EST Wed Feb 4 2026

TODAY
W winds 10 to 15 kt. Seas around 2 ft. Wave Detail: W 2 ft at 4 seconds and NE 1 foot at 5 seconds.

TONIGHT
NW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 10 seconds.

THU
NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 1 foot at 4 seconds and E 1 foot at 13 seconds.

THU NIGHT
N winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 1 foot at 4 seconds and E 1 foot at 14 seconds.

FRI
NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 1 foot at 2 seconds and W 1 foot at 4 seconds.

FRI NIGHT
SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 1 foot at 4 seconds and SW 1 foot at 5 seconds. A chance of snow after midnight.

SAT
NW winds 30 to 35 kt with gusts up to 40 kt. Seas 3 to 5 ft. Light freezing spray. Snow likely.

SAT NIGHT
NW winds 30 to 40 kt with gusts up to 45 kt. Seas 5 to 7 ft. Heavy freezing spray. Snow likely.

SUN
NW winds 25 to 35 kt. Seas 4 to 6 ft. Heavy freezing spray.

SUN NIGHT
NW winds 20 to 25 kt. Seas 3 to 5 ft. 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.

ANZ233-042200
Vineyard Sound
404 AM EST Wed Feb 4 2026

TODAY
NW winds 10 to 15 kt. Gusts up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and NE 1 foot at 5 seconds.

TONIGHT
NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NW 2 ft at 4 seconds and SE 1 foot at 10 seconds.

THU
NW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: N 1 foot at 4 seconds and SE 1 foot at 11 seconds.

THU NIGHT
N winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NW 1 foot at 4 seconds and SE 1 foot at 11 seconds.

FRI
N winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft in the morning, then 1 foot or less. Wave Detail: NE 1 foot at 2 seconds and SW 1 foot at 4 seconds.

FRI NIGHT
SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 1 foot at 3 seconds and SW 1 foot at 4 seconds. A chance of snow after midnight.

SAT
NW winds 30 to 35 kt with gusts up to 40 kt. Seas 3 to 5 ft. Light freezing spray. Snow likely.

SAT NIGHT
NW winds 30 to 40 kt with gusts up to 45 kt. Seas 4 to 6 ft. Heavy freezing spray. A chance of snow.

SUN
NW winds 25 to 30 kt with gusts up to 35 kt. Seas 3 to 5 ft. Heavy freezing spray.

SUN NIGHT
NW winds 20 to 25 kt. Seas 2 to 4 ft. Heavy 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.

ANZ234-042200
Buzzards Bay
404 AM EST Wed Feb 4 2026

TODAY
W winds 10 to 15 kt. Gusts up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and NE 1 foot at 4 seconds.

TONIGHT
NW winds 5 to 10 kt. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: NW 2 ft at 4 seconds and SE 1 foot at 10 seconds, becoming N 1 foot at 4 seconds and E 1 foot at 11 seconds.

THU
NW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: N 1 foot at 4 seconds and E 1 foot at 11 seconds.

THU NIGHT
N winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: NW 1 foot at 3 seconds and E 1 foot at 12 seconds.

FRI
N winds 5 to 10 kt, becoming E in the afternoon. Seas 1 foot or less. Wave Detail: NE 1 foot at 2 seconds and W 1 foot at 4 seconds.

FRI NIGHT
SW winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft after midnight. Wave Detail: E 1 foot at 3 seconds and SW 1 foot at 4 seconds, becoming SW 1 foot at 3 seconds and E 1 foot at 4 seconds. A chance of snow.

SAT
NW winds 30 to 35 kt with gusts up to 40 kt. Seas 2 to 4 ft. Freezing spray. Snow likely.

SAT NIGHT
NW winds 30 to 40 kt with gusts up to 45 kt. Seas 3 to 5 ft. Heavy freezing spray. A chance of snow.

SUN AND SUN NIGHT
NW winds 25 to 30 kt with gusts up to 35 kt, diminishing to 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Heavy 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.

ANZ235-042200
Rhode Island Sound
404 AM EST Wed Feb 4 2026

TODAY
NW winds 10 to 15 kt. Gusts up to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: W 3 ft at 4 seconds and SE 1 foot at 10 seconds.

TONIGHT
NW winds 10 to 15 kt, becoming N 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and SE 1 foot at 9 seconds.

THU
N winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 1 foot at 4 seconds and SE 1 foot at 10 seconds.

THU NIGHT
N winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 1 foot at 2 seconds and SW 1 foot at 6 seconds.

FRI
N winds 5 to 10 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: NE 1 foot at 3 seconds and SW 1 foot at 5 seconds.

FRI NIGHT
SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 1 foot at 3 seconds and SW 1 foot at 6 seconds. A chance of snow.

SAT
NW winds 30 to 35 kt with gusts up to 40 kt. Seas 4 to 6 ft. Light freezing spray. Snow likely.

SAT NIGHT
NW winds 30 to 40 kt with gusts up to 45 kt. Seas 5 to 7 ft. Heavy freezing spray. A chance of snow.

SUN
NW winds 25 to 30 kt with gusts up to 35 kt. Seas 4 to 6 ft. Freezing spray.

SUN NIGHT
NW winds 20 to 25 kt. Seas 2 to 4 ft. 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.

ANZ237-042200
Block Island Sound
404 AM EST Wed Feb 4 2026

TODAY
NW winds 10 to 15 kt. Gusts up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: W 2 ft at 4 seconds and SE 1 foot at 10 seconds.

TONIGHT
NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and SE 1 foot at 10 seconds.

THU
N winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 1 foot at 3 seconds and SE 1 foot at 12 seconds.

THU NIGHT
N winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 1 foot at 2 seconds and W 1 foot at 5 seconds.

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

FRI NIGHT
SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 1 foot at 3 seconds and S 1 foot at 7 seconds. A chance of snow in the evening, then snow likely after midnight.

SAT
NW winds 25 to 30 kt with gusts up to 40 kt. Seas 3 to 5 ft. Light freezing spray. Snow likely.

SAT NIGHT
NW winds 25 to 35 kt with gusts up to 45 kt. Seas 5 to 7 ft. Heavy freezing spray. A chance of snow.

SUN
NW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. Freezing spray.

SUN NIGHT
NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. 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.

ANZ230-042200
Boston Harbor
404 AM EST Wed Feb 4 2026

TODAY
W winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft.

TONIGHT
NW winds 10 to 15 kt. Waves 1 foot or less.

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

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

FRI
N winds 5 to 10 kt, becoming E in the afternoon. Waves 1 foot or less.

FRI NIGHT
S winds 5 to 10 kt. Waves 1 foot or less. A chance of snow.

SAT
NW winds 25 to 30 kt with gusts up to 40 kt. Waves around 2 ft. Snow likely.

SAT NIGHT
NW winds 25 to 35 kt with gusts up to 45 kt. Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance. A chance of heavy freezing spray. A chance of snow.

SUN
NW winds 25 to 30 kt. Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance. A chance of heavy freezing spray.

SUN NIGHT
NW winds 20 to 25 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.

ANZ236-042200
Narragansett Bay
404 AM EST Wed Feb 4 2026

TODAY
W winds 5 to 10 kt, becoming NW 10 to 15 kt this afternoon. Gusts up to 20 kt. Waves around 2 ft.

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

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

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

FRI
N winds 5 to 10 kt, becoming SE in the afternoon. Waves 1 foot or less.

FRI NIGHT
SW winds 5 to 10 kt. Waves 1 foot or less, then around 2 ft after midnight. A chance of snow in the evening, then snow likely after midnight.

SAT
NW winds 25 to 30 kt with gusts up to 35 kt. Waves 2 to 3 ft. Freezing spray. Snow likely.

SAT NIGHT
NW winds 25 to 30 kt with gusts up to 40 kt. Waves around 3 ft. Heavy freezing spray. A chance of snow.

SUN
NW winds 20 to 25 kt with gusts up to 30 kt. Waves 2 to 3 ft. Heavy freezing spray.

SUN NIGHT
NW winds 10 to 15 kt with gusts up to 20 kt. Waves 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.

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