164
FZUS51 KBOX 240304
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1004 PM EST Sun Nov 23 2025

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

ANZ200-241600-
1004 PM EST Sun Nov 23 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
A weak low pres moves E of the waters tonight followed by gusty NW
winds. High pres builds over the waters late Mon and Mon night
moving offshore Tue. A warm front lifts N across the region Tue
night followed by a strong cold front Wed night. Gusty post frontal
W winds develop Thu into Sat as strong low pres moves into the
Maritimes.

$$

ANZ250-241600-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1004 PM EST Sun Nov 23 2025

.OVERNIGHT...NW winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
N 2 ft at 4 seconds and SE 1 foot at 8 seconds. Isolated
sprinkles.
.MON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NW 3 ft at 4 seconds and SE 1 foot at
10 seconds.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt,
becoming W after midnight. Seas 2 to 3 ft. Wave Detail: NW 3 ft
at 4 seconds and E 1 foot at 9 seconds.
.TUE...SW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and
NE 1 foot at 4 seconds. A chance of rain in the afternoon.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and E 1 foot at
9 seconds. Rain.
.WED...S winds 10 to 15 kt with gusts up to 20 kt, diminishing to
5 to 10 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 4 seconds and SE 2 ft at 9 seconds. A chance of rain in the
morning, then a chance of showers in the afternoon.
.WED NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 2 to 3 ft. Showers likely,
mainly in the evening.
.THU THROUGH FRI...W winds 25 to 30 kt with gusts up to 40 kt.
Seas 3 to 5 ft.
.FRI NIGHT...W winds 25 to 30 kt with gusts up to 40 kt. Seas
4 to 6 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.

$$

ANZ251-241600-
Massachusetts Bay and Ipswich Bay-
1004 PM EST Sun Nov 23 2025

.OVERNIGHT...W winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
W 1 foot at 2 seconds and NE 1 foot at 4 seconds.
.MON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 3 seconds and E 1 foot at 9 seconds.
.MON NIGHT...W winds 10 to 15 kt, becoming SW after midnight.
Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot
at 10 seconds.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: SW 2 ft at 3 seconds and NE 1 foot at
4 seconds. A chance of rain in the afternoon.
.TUE NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
S 2 ft at 4 seconds and E 1 foot at 9 seconds. Rain.
.WED...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft
at 4 seconds and E 1 foot at 9 seconds. A chance of rain in the
morning, then a chance of showers in the afternoon.
.WED NIGHT...S winds 5 to 10 kt, becoming SW 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 2 to 3 ft. Showers likely,
mainly in the evening.
.THU THROUGH FRI NIGHT...W winds 25 to 30 kt with gusts up to
35 kt. Seas 3 to 5 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.

$$

ANZ231-241600-
Cape Cod Bay-
1004 PM EST Sun Nov 23 2025

.OVERNIGHT...W winds 10 to 15 kt. Gusts up to 20 kt. Seas around
2 ft. Wave Detail: N 2 ft at 4 seconds and SE 1 foot at
7 seconds.
.MON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NW 2 ft at 4 seconds and SE 1 foot at
8 seconds.
.MON NIGHT...NW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at
9 seconds.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 3 seconds and N 1 foot at
4 seconds.
.TUE NIGHT AND WED...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: SW 1 foot at 3 seconds and E
1 foot at 9 seconds. Rain, then a chance of showers in the
afternoon.
.WED NIGHT...SW winds 10 to 15 kt. Gusts up to 25 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and S
2 ft at 8 seconds. A chance of showers.
.THU THROUGH FRI NIGHT...W winds 25 to 30 kt with gusts up to
35 kt. Seas 3 to 5 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.

$$

ANZ254-241600-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1004 PM EST Sun Nov 23 2025

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

.OVERNIGHT...W winds 5 to 10 kt, becoming NW 10 to 15 kt. Gusts
up to 20 kt. Seas 2 to 4 ft. Wave Detail: N 2 ft at 5 seconds and
S 2 ft at 7 seconds. Isolated sprinkles.
.MON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: N 3 ft at 4 seconds and SE 2 ft at 9 seconds.
.MON NIGHT...NW winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Seas 2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and E
1 foot at 9 seconds.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 4 seconds and NE 1 foot at
4 seconds.
.TUE NIGHT AND WED...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: SE 4 ft at 9 seconds and S 3 ft at
4 seconds. Rain, then a chance of showers in the afternoon.
.WED NIGHT...SW winds 10 to 15 kt, increasing to 15 to 20 kt
after midnight. Gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S
4 ft at 8 seconds and W 2 ft at 4 seconds. Showers likely, mainly
in the evening.
.THU THROUGH FRI...W winds 25 to 30 kt with gusts up to 35 kt.
Seas 4 to 6 ft.
.FRI NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas
5 to 7 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.

$$

ANZ255-241600-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1004 PM EST Sun Nov 23 2025

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

.OVERNIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. Wave Detail: SW 4 ft at 7 seconds and NE 1 foot at
6 seconds. Isolated sprinkles.
.MON...NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: W 4 ft
at 6 seconds and N 1 foot at 5 seconds.
.MON NIGHT...NW winds 5 to 10 kt, becoming W after midnight. Seas
2 to 3 ft. Wave Detail: W 3 ft at 6 seconds and N 1 foot at
4 seconds.
.TUE...SW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft
at 5 seconds and NE 1 foot at 4 seconds.
.TUE NIGHT...S winds 15 to 20 kt. Seas 3 to 5 ft. Wave Detail: SW
5 ft at 6 seconds and E 1 foot at 9 seconds. Rain.
.WED...SW winds 15 to 20 kt. Seas 4 to 6 ft. Wave Detail: S 6 ft
at 9 seconds and SW 5 ft at 6 seconds. Rain likely in the
morning, then a chance of showers in the afternoon.
.WED NIGHT...SW winds 15 to 20 kt, becoming W 20 to 25 kt with
gusts up to 30 kt after midnight. Seas 4 to 6 ft. A chance of
showers.
.THU THROUGH FRI...W winds 25 to 35 kt with gusts up to 40 kt.
Seas 5 to 8 ft.
.FRI NIGHT...W winds 30 to 35 kt with gusts up to 45 kt. Seas
6 to 9 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.

$$

ANZ256-241600-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1004 PM EST Sun Nov 23 2025

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

.OVERNIGHT...NW winds around 20 kt with gusts up to 25 kt. Seas
4 to 5 ft. Wave Detail: NW 5 ft at 5 seconds and S 2 ft at
7 seconds.
.MON...NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: N 5 ft
at 4 seconds and SE 1 foot at 9 seconds.
.MON NIGHT...NW winds 5 to 10 kt, becoming W after midnight. Seas
2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and SE 1 foot at
9 seconds.
.TUE...SW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft
at 5 seconds and N 1 foot at 3 seconds. A chance of rain in the
afternoon.
.TUE NIGHT AND WED...SW winds 15 to 20 kt with gusts up to 25 kt.
Seas 4 to 6 ft. Wave Detail: S 5 ft at 6 seconds and SE 5 ft at
9 seconds. Rain, then a chance of showers in the afternoon.
.WED NIGHT...SW winds 15 to 20 kt, becoming W 20 to 25 kt with
gusts up to 30 kt after midnight. Seas 4 to 6 ft. Wave Detail: SW
6 ft at 7 seconds and W 2 ft at 4 seconds. A chance of showers.
.THU THROUGH FRI NIGHT...W winds 25 to 35 kt with gusts up to
45 kt. Seas 5 to 8 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.

$$

ANZ232-241600-
Nantucket Sound-
1004 PM EST Sun Nov 23 2025

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

.OVERNIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: W 2 ft at 4 seconds and NE 1 foot at
5 seconds. Isolated sprinkles.
.MON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 5 seconds and SE 1 foot at
8 seconds.
.MON NIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N
1 foot at 4 seconds and SE 1 foot at 9 seconds.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 4 seconds and NE 1 foot at
4 seconds.
.TUE NIGHT AND WED...SW winds 15 to 20 kt. Seas 2 to 3 ft. Wave
Detail: S 3 ft at 4 seconds and S 2 ft at 9 seconds. Rain, then a
chance of showers in the afternoon.
.WED NIGHT...SW winds 10 to 15 kt, increasing to 15 to 20 kt
after midnight. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail:
SW 3 ft at 4 seconds and S 2 ft at 8 seconds. A chance of
showers.
.THU THROUGH FRI NIGHT...W winds 25 to 30 kt with gusts up to
40 kt. Seas 3 to 5 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.

$$

ANZ233-241600-
Vineyard Sound-
1004 PM EST Sun Nov 23 2025

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

.OVERNIGHT...NW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: SW 3 ft at 6 seconds and NE 1 foot at
5 seconds.
.MON...NW winds 10 to 15 kt. Gusts up to 25 kt in the morning.
Seas 2 to 3 ft. Wave Detail: W 3 ft at 5 seconds and N 1 foot at
4 seconds.
.MON NIGHT...W winds 5 to 10 kt. Seas around 2 ft in the evening,
then 1 foot or less. Wave Detail: W 2 ft at 5 seconds and N
1 foot at 4 seconds, becoming N 1 foot at 3 seconds and W 1 foot
at 4 seconds.
.TUE...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and
N 1 foot at 3 seconds. A chance of rain in the afternoon.
.TUE NIGHT AND WED...SW winds 15 to 20 kt. Seas 2 to 4 ft. Wave
Detail: SW 4 ft at 7 seconds. Rain, then a chance of showers in
the afternoon.
.WED NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt after
midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft
at 7 seconds and SW 2 ft at 4 seconds. A chance of showers.
.THU THROUGH FRI NIGHT...W winds 25 to 30 kt with gusts up to
40 kt. Seas 3 to 5 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.

$$

ANZ234-241600-
Buzzards Bay-
1004 PM EST Sun Nov 23 2025

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

.OVERNIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: W 2 ft at 4 seconds and NE 1 foot at
5 seconds.
.MON...NW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas 2 to 3 ft. Wave Detail: NW 2 ft at 5 seconds and SE 1 foot
at 9 seconds.
.MON NIGHT...W winds 5 to 10 kt. Seas around 2 ft in the evening,
then 1 foot or less. Wave Detail: NW 1 foot at 4 seconds and SE
1 foot at 9 seconds, becoming N 1 foot at 4 seconds and SW 1 foot
at 4 seconds.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 5 seconds and N 1 foot at
4 seconds. A chance of rain in the afternoon.
.TUE NIGHT...S winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and
SE 1 foot at 9 seconds. Rain.
.WED...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft
at 5 seconds and SW 3 ft at 8 seconds. A chance of rain in the
morning, then a chance of showers in the afternoon.
.WED NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 2 to 3 ft. A chance of
showers.
.THU THROUGH FRI NIGHT...W winds 25 to 30 kt with gusts up to
35 kt. Seas 3 to 5 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.

$$

ANZ235-241600-
Rhode Island Sound-
1004 PM EST Sun Nov 23 2025

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

.OVERNIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: SW 4 ft at 7 seconds.
.MON...NW 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: NW
4 ft at 4 seconds and SE 1 foot at 9 seconds.
.MON NIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
NW 2 ft at 4 seconds and SE 1 foot at 9 seconds.
.TUE...SW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft
at 5 seconds and N 1 foot at 2 seconds. A chance of rain in the
afternoon.
.TUE NIGHT...S winds 15 to 20 kt. Seas 2 to 4 ft. Wave Detail: S
4 ft at 7 seconds. Rain.
.WED...SW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas 3 to 5 ft. Wave Detail: SW 5 ft at 6 seconds. A chance of
rain in the morning, then a chance of showers in the afternoon.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 20 to 25 kt with gusts up to 30 kt after midnight.
Seas 3 to 5 ft. A chance of showers.
.THU THROUGH FRI NIGHT...W winds 25 to 30 kt with gusts up to
40 kt. Seas 4 to 6 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.

$$

ANZ237-241600-
Block Island Sound-
1004 PM EST Sun Nov 23 2025

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

.OVERNIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas
around 3 ft. Wave Detail: W 3 ft at 4 seconds and S 2 ft at
7 seconds.
.MON...NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: NW
3 ft at 3 seconds and S 1 foot at 8 seconds.
.MON NIGHT...NW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft in the evening, then 1 foot or less. Wave Detail: NW
1 foot at 3 seconds and SE 1 foot at 9 seconds, becoming N 1 foot
at 2 seconds and W 1 foot at 3 seconds.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at
9 seconds. A chance of rain in the afternoon.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft. Wave Detail: SE 4 ft at 9 seconds and S 3 ft at
5 seconds. Rain.
.WED...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft
at 7 seconds and SW 1 foot at 4 seconds. A chance of rain in the
morning, then a chance of showers in the afternoon.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 15 to 20 kt with gusts up to 30 kt after midnight.
Seas 3 to 4 ft. A chance of showers.
.THU THROUGH FRI...W winds 25 to 30 kt with gusts up to 40 kt.
Seas 3 to 5 ft.
.FRI NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas
4 to 6 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.

$$

ANZ230-241600-
Boston Harbor-
1004 PM EST Sun Nov 23 2025

.OVERNIGHT...W winds 5 to 10 kt. Waves 1 foot or less, then
around 2 ft.
.MON...NW winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft.
.MON NIGHT...W winds 5 to 10 kt. Waves 1 foot or less.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft. A chance of rain in the afternoon.
.TUE NIGHT...S winds around 10 kt. Waves 1 foot or less. Rain.
.WED...SW winds 5 to 10 kt. Waves 1 foot or less. A chance of
rain in the morning, then a chance of showers in the afternoon.
.WED NIGHT...S winds 5 to 10 kt, becoming W 15 to 20 kt with
gusts up to 25 kt after midnight. Waves 1 foot or less, then
around 2 ft after midnight. A chance of showers.
.THU THROUGH FRI NIGHT...W winds 20 to 25 kt with gusts up to
35 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.

$$

ANZ236-241600-
Narragansett Bay-
1004 PM EST Sun Nov 23 2025

.OVERNIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Waves
2 to 3 ft.
.MON...NW winds 10 to 15 kt, diminishing to 5 to 10 kt in the
afternoon. Gusts up to 25 kt. Waves 2 to 3 ft.
.MON NIGHT...W winds 5 to 10 kt. Waves 1 foot or less.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft. A chance of rain in the afternoon.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Waves
2 to 3 ft. Rain.
.WED...SW winds around 10 kt. Waves 2 to 3 ft. A chance of rain
in the morning, then a chance of showers in the afternoon.
.WED NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt with
gusts up to 25 kt after midnight. Waves 2 to 3 ft. A chance of
showers.
.THU THROUGH FRI NIGHT...W winds 20 to 25 kt with gusts up to
35 kt. Waves 2 to 3 ft, except 4 to 6 ft at the bay entrance.

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