383
FZUS51 KBOX 010503
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
103 AM EDT Wed Oct 1 2025

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

ANZ200-011800-
103 AM EDT Wed Oct 1 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
Strong high pressure builds in this afternoon and
overnight. Increasing NE winds to gale force are and building seas
are expected late tonight and Wed as Humberto makes its closest
approach. High pres then settles over the waters late in the week,
allowing for light winds.

$$

ANZ250-011800-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
103 AM EDT Wed Oct 1 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE THURSDAY NIGHT...

.REST OF TONIGHT...NE winds 20 to 25 kt with gusts up to 30 kt.
Seas 5 to 8 ft. Wave Detail: NE 7 ft at 6 seconds and SE 4 ft at
14 seconds.
.WED...NE winds 20 to 25 kt with gusts up to 40 kt. Seas 7 to
10 ft. Wave Detail: NE 9 ft at 7 seconds and SE 4 ft at
15 seconds.
.WED NIGHT...NE winds 25 to 30 kt, diminishing to 20 to 25 kt
after midnight. Gusts up to 40 kt. Seas 7 to 10 ft. Wave Detail:
NE 9 ft at 7 seconds and SE 4 ft at 14 seconds.
.THU...NE winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 6 to 9 ft, subsiding to 5 to
7 ft in the afternoon. Wave Detail: NE 8 ft at 8 seconds and SE
4 ft at 13 seconds, becoming NE 6 ft at 8 seconds and SE 3 ft at
12 seconds.
.THU NIGHT THROUGH FRI NIGHT...W winds 5 to 10 kt. Seas 3 to
5 ft. Wave Detail: E 5 ft at 10 seconds and SW 2 ft at 3 seconds.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft.
Wave Detail: E 3 ft at 10 seconds and W 2 ft at 3 seconds.

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.

$$

ANZ251-011800-
Massachusetts Bay and Ipswich Bay-
103 AM EDT Wed Oct 1 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON...

.REST OF TONIGHT...NE winds 20 to 25 kt with gusts up to 30 kt.
Seas 4 to 6 ft. Wave Detail: NE 6 ft at 5 seconds and SE 2 ft at
13 seconds.
.WED...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to
7 ft. Wave Detail: NE 7 ft at 7 seconds and SE 1 foot at
16 seconds.
.WED NIGHT...NE winds 25 to 30 kt, diminishing to 20 to 25 kt
after midnight. Seas 5 to 7 ft. Wave Detail: NE 7 ft at 7 seconds
and SE 1 foot at 14 seconds.
.THU...NE winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: NE
6 ft at 8 seconds and SE 1 foot at 15 seconds.
.THU NIGHT THROUGH FRI NIGHT...W winds 5 to 10 kt. Seas 2 to
4 ft. Wave Detail: E 4 ft at 8 seconds and E 3 ft at 11 seconds.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft.
Wave Detail: E 3 ft at 10 seconds and W 1 foot at 3 seconds.

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.

$$

ANZ231-011800-
Cape Cod Bay-
103 AM EDT Wed Oct 1 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TONIGHT...NE winds 20 to 25 kt with gusts up to 30 kt.
Seas 3 to 5 ft. Wave Detail: N 5 ft at 4 seconds and SE 2 ft at
15 seconds.
.WED...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 4 to
6 ft. Wave Detail: N 6 ft at 5 seconds and SE 2 ft at 15 seconds.
.WED NIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas
4 to 6 ft. Wave Detail: N 6 ft at 6 seconds and S 2 ft at
14 seconds.
.THU...NE winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: N 5 ft
at 6 seconds and SE 2 ft at 13 seconds.
.THU NIGHT THROUGH FRI NIGHT...W winds 5 to 10 kt. Seas 2 to
3 ft. Wave Detail: N 3 ft at 6 seconds and SE 2 ft at 11 seconds.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 kt. Seas around 2 ft.
Wave Detail: E 2 ft at 10 seconds and W 1 foot at 2 seconds.

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.

$$

ANZ254-011800-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
103 AM EDT Wed Oct 1 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TONIGHT...NE winds 25 to 30 kt. Seas 6 to 9 ft. Wave
Detail: NE 8 ft at 6 seconds and S 6 ft at 15 seconds.
.WED...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 9 to
12 ft. Wave Detail: NE 9 ft at 7 seconds and S 6 ft at
15 seconds.
.WED NIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas
9 to 12 ft. Wave Detail: NE 10 ft at 8 seconds and S 6 ft at
14 seconds.
.THU...NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Gusts up to 30 kt. Seas 6 to 9 ft, subsiding to 5 to
7 ft in the afternoon. Wave Detail: NE 9 ft at 8 seconds and S
4 ft at 12 seconds, becoming NE 7 ft at 8 seconds and S 3 ft at
12 seconds.
.THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming NW around 5 kt after midnight. Seas 4 to 6 ft. Wave
Detail: NE 6 ft at 9 seconds and S 2 ft at 12 seconds.
.FRI AND FRI NIGHT...W winds 10 to 15 kt. Seas 3 to 5 ft. Wave
Detail: E 5 ft at 11 seconds and W 2 ft at 4 seconds.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 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.

$$

ANZ255-011800-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
103 AM EDT Wed Oct 1 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TONIGHT...NE winds 25 to 30 kt with gusts up to 35 kt.
Seas 7 to 10 ft. Wave Detail: NE 8 ft at 6 seconds and S 7 ft at
15 seconds.
.WED...NE winds around 30 kt with gusts up to 40 kt. Seas 9 to
12 ft. Wave Detail: NE 10 ft at 7 seconds and S 7 ft at
15 seconds.
.WED NIGHT...NE winds around 30 kt with gusts up to 40 kt. Seas
8 to 11 ft, subsiding to 6 to 9 ft after midnight. Wave Detail: N
10 ft at 6 seconds and S 7 ft at 13 seconds, becoming N 9 ft at
6 seconds and S 5 ft at 13 seconds.
.THU...NE winds 25 to 30 kt, diminishing to 20 to 25 kt in the
afternoon. Seas 5 to 7 ft. Wave Detail: NE 7 ft at 8 seconds and
S 3 ft at 12 seconds.
.THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming N around 5 kt after midnight. Seas 4 to 6 ft. Wave
Detail: NE 6 ft at 9 seconds and S 2 ft at 12 seconds.
.FRI AND FRI NIGHT...W winds 10 to 15 kt. Seas 2 to 4 ft. Wave
Detail: E 4 ft at 10 seconds and SE 4 ft at 11 seconds.
.SAT THROUGH SUN NIGHT...SW winds 10 to 15 kt. Seas 2 to 4 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.

$$

ANZ256-011800-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
103 AM EDT Wed Oct 1 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE THURSDAY NIGHT...

.REST OF TONIGHT...NE winds 25 to 30 kt with gusts up to 35 kt.
Seas 7 to 10 ft. Wave Detail: NE 10 ft at 7 seconds and S 6 ft at
15 seconds.
.WED...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 9 to
12 ft. Wave Detail: NE 10 ft at 7 seconds and S 6 ft at
15 seconds.
.WED NIGHT...NE winds 25 to 30 kt with gusts up to 35 kt. Seas
8 to 11 ft. Wave Detail: N 10 ft at 6 seconds and SE 6 ft at
13 seconds.
.THU...NE winds 25 to 30 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 5 to 7 ft. Wave Detail: N 7 ft at 6 seconds and
SE 3 ft at 12 seconds.
.THU NIGHT...NE winds 10 to 15 kt, diminishing to around 5 kt
after midnight. Seas 3 to 5 ft. Wave Detail: NE 5 ft at 9 seconds
and S 2 ft at 12 seconds.
.FRI AND FRI NIGHT...W winds 10 to 15 kt. Seas 3 to 4 ft. Wave
Detail: E 4 ft at 11 seconds and SW 3 ft at 4 seconds.
.SAT THROUGH SUN NIGHT...SW winds 10 to 15 kt. Seas 2 to 4 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.

$$

ANZ232-011800-
Nantucket Sound-
103 AM EDT Wed Oct 1 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TONIGHT...NE winds 25 to 30 kt with gusts up to 35 kt.
Seas 4 to 6 ft. Wave Detail: NE 5 ft at 5 seconds and S 2 ft at
14 seconds.
.WED...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to
7 ft. Wave Detail: N 6 ft at 5 seconds and S 2 ft at 14 seconds.
.WED NIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas
5 to 7 ft. Wave Detail: N 6 ft at 5 seconds and S 2 ft at
13 seconds.
.THU...NE winds 25 to 30 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 3 to 5 ft. Wave Detail: N 5 ft at 5 seconds and S
2 ft at 12 seconds.
.THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming NW around 5 kt after midnight. Seas 2 to 4 ft. Wave
Detail: N 4 ft at 6 seconds and S 1 foot at 12 seconds.
.FRI AND FRI NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 9 seconds and W 2 ft at 3 seconds.
.SAT THROUGH SUN NIGHT...SW winds 10 to 15 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.

$$

ANZ233-011800-
Vineyard Sound-
103 AM EDT Wed Oct 1 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TONIGHT...NE winds 20 to 25 kt with gusts up to 30 kt.
Seas 3 to 5 ft. Wave Detail: NE 4 ft at 4 seconds and S 3 ft at
15 seconds.
.WED...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 4 to
6 ft. Wave Detail: N 4 ft at 4 seconds and S 3 ft at 15 seconds.
.WED NIGHT...NE winds 25 to 30 kt with gusts up to 35 kt. Seas
4 to 6 ft. Wave Detail: N 4 ft at 6 seconds and S 3 ft at
13 seconds.
.THU...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: N 4 ft at 5 seconds and S 2 ft at 13 seconds.
.THU NIGHT...NE winds 5 to 10 kt, becoming NW after midnight.
Seas 2 to 3 ft. Wave Detail: N 2 ft at 5 seconds and S 2 ft at
12 seconds.
.FRI AND FRI NIGHT...W winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: SW 2 ft at 4 seconds and E 2 ft at 9 seconds.
.SAT THROUGH SUN NIGHT...SW winds 10 to 15 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.

$$

ANZ234-011800-
Buzzards Bay-
103 AM EDT Wed Oct 1 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TONIGHT...NE winds 20 to 25 kt with gusts up to 30 kt.
Seas 3 to 4 ft. Wave Detail: NE 3 ft at 4 seconds and S 3 ft at
15 seconds.
.WED...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 4 to
6 ft. Wave Detail: N 4 ft at 4 seconds and S 3 ft at 15 seconds.
.WED NIGHT...NE winds 25 to 30 kt, diminishing to 20 to 25 kt
after midnight. Seas 3 to 5 ft. Wave Detail: N 4 ft at 5 seconds
and S 3 ft at 13 seconds.
.THU...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: N 3 ft at 5 seconds and S 2 ft at 13 seconds.
.THU NIGHT...NE winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: N 2 ft at 5 seconds and S 1 foot
at 12 seconds.
.FRI AND FRI NIGHT...W winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: SW 2 ft at 4 seconds and E 2 ft at 8 seconds.
.SAT THROUGH SUN NIGHT...SW winds 10 to 15 kt with gusts up 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.

$$

ANZ235-011800-
Rhode Island Sound-
103 AM EDT Wed Oct 1 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON...

.REST OF TONIGHT...NE winds 25 to 30 kt. Seas 5 to 8 ft. Wave
Detail: NE 7 ft at 6 seconds and S 6 ft at 15 seconds.
.WED...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 6 to
9 ft. Wave Detail: NE 7 ft at 6 seconds and S 6 ft at 14 seconds.
.WED NIGHT...NE winds 25 to 30 kt. Seas 6 to 9 ft, subsiding to
5 to 7 ft after midnight. Wave Detail: N 7 ft at 6 seconds and S
6 ft at 14 seconds, becoming N 7 ft at 6 seconds and SE 5 ft at
13 seconds.
.THU...NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 3 to 5 ft. Wave Detail: N 5 ft at 5 seconds and
SE 4 ft at 12 seconds.
.THU NIGHT...NE winds 5 to 10 kt, becoming W after midnight. Seas
2 to 4 ft. Wave Detail: N 3 ft at 5 seconds and S 3 ft at
12 seconds.
.FRI AND FRI NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: SW 3 ft at 4 seconds and E 2 ft at 9 seconds.
.SAT THROUGH SUN NIGHT...SW winds 10 to 15 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.

$$

ANZ237-011800-
Block Island Sound-
103 AM EDT Wed Oct 1 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON...

.REST OF TONIGHT...NE winds 20 to 25 kt with gusts up to 30 kt.
Seas 5 to 8 ft. Wave Detail: NE 6 ft at 6 seconds and S 6 ft at
15 seconds.
.WED...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
9 ft. Wave Detail: NE 7 ft at 7 seconds and S 6 ft at 14 seconds.
.WED NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas
6 to 9 ft, subsiding to 5 to 7 ft after midnight. Wave Detail: NE
6 ft at 7 seconds and SE 6 ft at 14 seconds, becoming NE 6 ft at
7 seconds and SE 5 ft at 13 seconds.
.THU...NE winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 4 to 6 ft, subsiding to 3 to
4 ft in the afternoon. Wave Detail: NE 6 ft at 6 seconds and SE
4 ft at 12 seconds, becoming E 4 ft at 7 seconds and S 3 ft at
12 seconds.
.THU NIGHT THROUGH FRI NIGHT...W winds 5 to 10 kt. Seas 2 to
4 ft. Wave Detail: E 4 ft at 7 seconds and SE 3 ft at 12 seconds.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft.
Wave Detail: SE 3 ft at 12 seconds and W 2 ft at 3 seconds.

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.

$$

ANZ230-011800-
Boston Harbor-
103 AM EDT Wed Oct 1 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.REST OF TONIGHT...NE winds 15 to 20 kt with gusts up to 25 kt.
Waves 2 to 3 ft.
.WED...NE winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to
3 ft.
.WED NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Waves
2 to 3 ft.
.THU...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft.
.THU NIGHT THROUGH FRI NIGHT...W winds 5 to 10 kt. Waves 1 foot
or less.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 kt. Waves 1 foot or
less.

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.

$$

ANZ236-011800-
Narragansett Bay-
103 AM EDT Wed Oct 1 2025

.REST OF TONIGHT...NE winds 15 to 20 kt with gusts up to 25 kt.
Waves 2 to 3 ft.
.WED...NE winds 20 to 25 kt with gusts up to 30 kt. Waves around
3 ft, except 4 to 6 ft at the bay entrance.
.WED NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Waves
2 to 3 ft, except 4 to 6 ft at the bay entrance.
.THU...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft.
.THU NIGHT THROUGH FRI NIGHT...W winds 5 to 10 kt. Waves around
2 ft.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 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.

$$

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston