362
FZUS51 KBOX 241404
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1004 AM EDT Sun Aug 24 2025

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

ANZ200-250300-
1004 AM EDT Sun Aug 24 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
Seas will gradually trend downward tonight through Sunday. Breezy
southwest winds shift south Sunday ahead of a cold front expected to
pass over the waters Monday afternoon/evening. High pressure builds
in from the west on Tuesday and remains in control through midweek.

$$

ANZ250-250300-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1004 AM EDT Sun Aug 24 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.THIS AFTERNOON...S winds 15 to 20 kt with gusts up to 25 kt.
Seas 4 to 6 ft. Wave Detail: E 4 ft at 11 seconds and SE 3 ft at
6 seconds.
.TONIGHT...S winds 15 to 20 kt, diminishing to 10 to 15 kt after
midnight. Gusts up to 25 kt. Seas 4 to 6 ft, subsiding to 3 to
4 ft after midnight. Wave Detail: S 3 ft at 5 seconds and E 3 ft
at 10 seconds, becoming SE 3 ft at 7 seconds and E 3 ft at
11 seconds.
.MON...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds and SW 1 foot at 3 seconds. A chance of showers.
.MON NIGHT...SW winds around 10 kt, becoming W with gusts up to
20 kt after midnight. Seas 3 to 5 ft. Wave Detail: SE 5 ft at
8 seconds and W 2 ft at 3 seconds.
.TUE...W winds 10 to 15 kt with gusts up to 20 kt, becoming SW in
the afternoon. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 8 seconds
and W 2 ft at 3 seconds.
.TUE NIGHT...W winds around 10 kt. Gusts up to 20 kt in the
evening. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 9 seconds and W
2 ft at 3 seconds.
.WED THROUGH THU NIGHT...SW winds 10 to 15 kt with gusts up to
25 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.

$$

ANZ251-250300-
Massachusetts Bay and Ipswich Bay-
1004 AM EDT Sun Aug 24 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.THIS AFTERNOON...S winds 10 to 15 kt with gusts up to 25 kt.
Seas 3 to 5 ft. Wave Detail: E 4 ft at 11 seconds and S 3 ft at
5 seconds.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 25 kt in the evening.
Seas 3 to 5 ft, subsiding to 2 to 3 ft after midnight. Wave
Detail: S 3 ft at 5 seconds and E 3 ft at 11 seconds, becoming SE
3 ft at 7 seconds and E 3 ft at 10 seconds. A chance of.
.MON...SE winds around 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 10 seconds and S 1 foot at 3 seconds. A chance of showers.
.MON NIGHT...SW winds around 10 kt, becoming W after midnight.
Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SW 1 foot at
3 seconds. A chance of showers in the evening.
.TUE...W winds around 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 8 seconds and W 1 foot at 3 seconds.
.TUE NIGHT...W winds around 10 kt. Seas 2 to 3 ft. Wave Detail: E
2 ft at 7 seconds and W 1 foot at 3 seconds.
.WED THROUGH THU NIGHT...SW 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.

$$

ANZ231-250300-
Cape Cod Bay-
1004 AM EDT Sun Aug 24 2025

.THIS AFTERNOON...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: E 3 ft at 11 seconds and S 2 ft at
3 seconds.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening.
Seas 2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and E 2 ft at
11 seconds.
.MON...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 6 seconds and S 1 foot at 2 seconds. A chance of showers.
.MON NIGHT...SW winds around 10 kt, becoming W after midnight.
Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SW 1 foot
at 2 seconds.
.TUE...W winds around 10 kt, becoming SW with gusts up to 20 kt
in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at
8 seconds and NW 1 foot at 3 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming NW 5 to 10 kt after midnight. Seas around 2 ft. Wave
Detail: SE 2 ft at 7 seconds and W 1 foot at 3 seconds.
.WED THROUGH THU NIGHT...SW 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.

$$

ANZ254-250300-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1004 AM EDT Sun Aug 24 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.THIS AFTERNOON...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 4 to 5 ft. Wave Detail: E 4 ft at 11 seconds and S 2 ft at
3 seconds.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening.
Seas 3 to 5 ft. Wave Detail: E 4 ft at 11 seconds and S 3 ft at
5 seconds. A chance of showers after midnight with vsby 1 to
3 NM.
.MON...E winds around 10 kt, becoming W in the afternoon. Seas
3 to 5 ft. Wave Detail: SE 5 ft at 8 seconds and E 3 ft at
11 seconds. A chance of showers. Patchy fog in the morning with
vsby 1 to 3 NM.
.MON NIGHT...W winds around 10 kt. Seas 3 to 5 ft. Wave Detail:
SE 5 ft at 8 seconds and SW 1 foot at 3 seconds.
.TUE...W winds around 10 kt, becoming SW with gusts up to 20 kt
in the afternoon. Seas 3 to 5 ft. Wave Detail: SE 5 ft at
8 seconds and W 1 foot at 3 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W after midnight. Seas 3 to 4 ft. Wave Detail: S 4 ft at
8 seconds and W 2 ft at 4 seconds.
.WED THROUGH THU NIGHT...SW winds 10 to 15 kt with gusts up to
20 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.

$$

ANZ255-250300-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1004 AM EDT Sun Aug 24 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.THIS AFTERNOON...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 5 ft. Wave Detail: E 4 ft at 11 seconds and S 3 ft at
4 seconds.
.TONIGHT...SE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: S
3 ft at 5 seconds and E 3 ft at 11 seconds. A chance of showers
after midnight with vsby 1 to 3 NM.
.MON...E winds 10 to 15 kt, becoming W in the afternoon. Seas
3 to 4 ft, building to 4 to 6 ft in the afternoon. Wave Detail:
SE 3 ft at 6 seconds and E 2 ft at 10 seconds, becoming SE 6 ft
at 8 seconds and E 2 ft at 10 seconds. A chance of showers.
Patchy fog in the morning with vsby 1 to 3 NM.
.MON NIGHT...W winds 10 to 15 kt. Seas 4 to 6 ft. Wave Detail: S
6 ft at 8 seconds and SW 1 foot at 3 seconds.
.TUE AND TUE NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 5 ft. Wave Detail: S 5 ft at 8 seconds and W 2 ft at
4 seconds.
.WED THROUGH THU NIGHT...SW winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE
3 ft at 8 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.

$$

ANZ256-250300-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1004 AM EDT Sun Aug 24 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.THIS AFTERNOON...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
4 to 5 ft. Wave Detail: E 4 ft at 11 seconds and S 3 ft at
4 seconds.
.TONIGHT...S winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E
4 ft at 11 seconds and S 3 ft at 7 seconds. A chance of showers
after midnight.
.MON...SE winds 5 to 10 kt, becoming SW in the afternoon. Seas
3 to 5 ft. Wave Detail: SE 5 ft at 8 seconds and E 2 ft at
11 seconds. A chance of showers in the morning.
.MON NIGHT...SW winds 10 to 15 kt, becoming NW after midnight.
Seas 4 to 6 ft. Wave Detail: S 6 ft at 8 seconds and E 1 foot at
10 seconds.
.TUE...NW winds around 10 kt, becoming W with gusts up to 20 kt
in the afternoon. Seas 4 to 5 ft. Wave Detail: S 5 ft at
8 seconds and NW 1 foot at 3 seconds.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming
NW after midnight. Seas 3 to 4 ft. Wave Detail: S 4 ft at
8 seconds and W 2 ft at 4 seconds.
.WED THROUGH THU NIGHT...SW winds 10 to 15 kt with gusts up to
20 kt. Seas 3 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.

$$

ANZ232-250300-
Nantucket Sound-
1004 AM EDT Sun Aug 24 2025

.THIS AFTERNOON...S winds around 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and S 2 ft at
7 seconds.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening.
Seas 2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and E 2 ft at
11 seconds. A chance of showers after midnight.
.MON...SE winds around 10 kt, becoming SW in the afternoon. Seas
2 to 3 ft. Wave Detail: S 2 ft at 5 seconds and E 2 ft at
11 seconds. A chance of showers.
.MON NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW
2 ft at 3 seconds and SE 2 ft at 8 seconds.
.TUE...W winds 10 to 15 kt, becoming SW with gusts up to 20 kt in
the afternoon. Seas 2 to 3 ft. Wave Detail: W 2 ft at 3 seconds
and SE 2 ft at 7 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 4 seconds and SE 1 foot at 7 seconds.
.WED THROUGH THU 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.

$$

ANZ233-250300-
Vineyard Sound-
1004 AM EDT Sun Aug 24 2025

.THIS AFTERNOON...S winds around 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and S 2 ft at
7 seconds.
.TONIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S
2 ft at 5 seconds and E 1 foot at 12 seconds. A chance of showers
after midnight.
.MON...SE winds 5 to 10 kt, becoming SW 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 6 seconds and
S 1 foot at 3 seconds.
.MON NIGHT...SW winds 10 to 15 kt, becoming NW after midnight.
Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and SW 1 foot at
3 seconds.
.TUE...W winds around 10 kt, becoming SW with gusts up to 20 kt
in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at
8 seconds and SW 2 ft at 4 seconds.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming
NW after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at
4 seconds and S 2 ft at 7 seconds.
.WED THROUGH THU NIGHT...SW 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.

$$

ANZ234-250300-
Buzzards Bay-
1004 AM EDT Sun Aug 24 2025

.THIS AFTERNOON...S winds around 15 kt with gusts up to 25 kt.
Seas 2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and S 2 ft at
7 seconds.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening.
Seas 2 to 3 ft. Wave Detail: S 2 ft at 5 seconds and E 2 ft at
12 seconds. A chance of. Patchy fog after midnight.
.MON...SE winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft
at 4 seconds and E 1 foot at 12 seconds.
.MON NIGHT...SW winds 10 to 15 kt, becoming NW after midnight.
Seas 2 to 3 ft. Wave Detail: S 2 ft at 8 seconds and SW 1 foot at
3 seconds.
.TUE...W winds around 10 kt, becoming SW with gusts up to 20 kt
in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft at
4 seconds and S 2 ft at 8 seconds.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming
NW after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at
4 seconds and S 1 foot at 7 seconds.
.WED THROUGH THU NIGHT...SW 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.

$$

ANZ235-250300-
Rhode Island Sound-
1004 AM EDT Sun Aug 24 2025

.THIS AFTERNOON...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and S 2 ft at
4 seconds.
.TONIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S
3 ft at 5 seconds and E 1 foot at 13 seconds. Patchy fog after
midnight. A chance of showers after midnight.
.MON...SE winds 5 to 10 kt, becoming SW in the afternoon. Seas
2 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and SW 1 foot at
2 seconds. Patchy fog in the morning.
.MON NIGHT...SW winds 10 to 15 kt, becoming NW after midnight.
Seas 3 to 5 ft. Wave Detail: S 5 ft at 8 seconds and SW 1 foot at
3 seconds.
.TUE...W winds around 10 kt, becoming SW with gusts up to 20 kt
in the afternoon. Seas 3 to 4 ft. Wave Detail: S 4 ft at
8 seconds and W 1 foot at 3 seconds.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming
NW after midnight. Seas 2 to 4 ft. Wave Detail: S 4 ft at
7 seconds and SW 2 ft at 4 seconds.
.WED THROUGH THU NIGHT...SW 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.

$$

ANZ237-250300-
Block Island Sound-
1004 AM EDT Sun Aug 24 2025

.THIS AFTERNOON...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SE 3 ft at 12 seconds and S 2 ft at
4 seconds.
.TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
3 ft at 5 seconds and SE 3 ft at 12 seconds. Patchy fog after
midnight.
.MON...S winds 5 to 10 kt, becoming SW in the afternoon. Seas
2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and E 1 foot at
12 seconds.
.MON NIGHT...SW winds around 10 kt, becoming NW after midnight.
Seas 2 to 4 ft. Wave Detail: S 4 ft at 8 seconds and SW 1 foot at
3 seconds.
.TUE...NW winds around 10 kt, becoming SW with gusts up to 20 kt
in the afternoon. Seas 3 to 4 ft. Wave Detail: SE 4 ft at
8 seconds and W 2 ft at 3 seconds.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming
NW after midnight. Seas 2 to 4 ft. Wave Detail: S 3 ft at
7 seconds and W 2 ft at 3 seconds.
.WED THROUGH THU NIGHT...SW 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.

$$

ANZ230-250300-
Boston Harbor-
1004 AM EDT Sun Aug 24 2025

.THIS AFTERNOON...S winds 10 to 15 kt. Gusts up to 20 kt. Waves
around 2 ft.
.TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Waves around 2 ft in
the evening, then 1 foot or less. A chance of.
.MON...SE winds 5 to 10 kt. Waves 1 foot or less. A chance of
showers.
.MON NIGHT...SW winds 5 to 10 kt, becoming W after midnight.
Waves 1 foot or less. A chance of showers in the evening.
.TUE AND TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt.
Waves around 2 ft.
.WED THROUGH THU NIGHT...SW 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.

$$

ANZ236-250300-
Narragansett Bay-
1004 AM EDT Sun Aug 24 2025

.THIS AFTERNOON...S winds 10 to 15 kt. Gusts up to 20 kt. Waves
2 to 3 ft.
.TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Waves around 2 ft.
Patchy fog after midnight.
.MON...S winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.
.MON NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Waves 2 to 3 ft.
.TUE...W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up
to 20 kt in the afternoon. Waves 2 to 3 ft.
.TUE NIGHT...W winds 5 to 10 kt with gusts up to 20 kt, becoming
NW after midnight. Waves 2 to 3 ft.
.WED THROUGH THU NIGHT...SW 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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