704
FZUS51 KBOX 281406
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu Aug 28 2025

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

ANZ200-290300-
1005 AM EDT Thu Aug 28 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pres builds over the waters today. The next cold front will
cross the waters sometime later Fri into Fri night, with high pres
then building back in for the weekend.

$$

ANZ250-290300-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1005 AM EDT Thu Aug 28 2025

.THIS AFTERNOON...SW winds 5 to 10 kt, becoming S 10 to 15 kt
with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at
7 seconds and SE 2 ft at 9 seconds.
.TONIGHT...S winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 2 ft at 8 seconds.
.FRI...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: S 3 ft at 4 seconds and E 2 ft at 8 seconds. A
chance of showers in the afternoon.
.FRI NIGHT...S winds 10 to 15 kt, becoming W after midnight.
Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at
4 seconds and E 1 foot at 8 seconds. Showers likely in the
evening.
.SAT...NW winds around 10 kt, becoming SW in the afternoon. Seas
around 2 ft. Wave Detail: W 2 ft at 3 seconds and SE 1 foot at
4 seconds.
.SAT NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: W 1 foot at 3 seconds and SE
1 foot at 5 seconds.
.SUN THROUGH MON NIGHT...SW winds 5 to 10 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.

$$

ANZ251-290300-
Massachusetts Bay and Ipswich Bay-
1005 AM EDT Thu Aug 28 2025

.THIS AFTERNOON...SW winds around 5 kt, becoming S 10 to 15 kt
with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at
5 seconds and E 2 ft at 9 seconds.
.TONIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: S 2 ft at 4 seconds and E 2 ft at 9 seconds.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 4 seconds and E 1 foot at 8 seconds.
Showers in the afternoon.
.FRI NIGHT...SW winds 5 to 10 kt with gusts up to 20 kt, becoming
W after midnight. Seas 2 to 3 ft. Wave Detail: SE 2 ft at
4 seconds and E 1 foot at 8 seconds. A chance of showers in the
evening.
.SAT...NW winds 5 to 10 kt, becoming SW in the afternoon. Seas
around 2 ft. Wave Detail: NW 1 foot at 2 seconds and SE 1 foot at
4 seconds.
.SAT NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: W 1 foot at 2 seconds and SE
1 foot at 4 seconds.
.SUN THROUGH MON NIGHT...SW winds 5 to 10 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.

$$

ANZ231-290300-
Cape Cod Bay-
1005 AM EDT Thu Aug 28 2025

.THIS AFTERNOON...SW winds around 5 kt, becoming S 10 to 15 kt
with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: N 1 foot at
3 seconds and S 1 foot at 7 seconds.
.TONIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: S 1 foot at 4 seconds and E 1 foot at
9 seconds.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: S 1 foot at 3 seconds and E 1 foot at
8 seconds. A chance of showers in the afternoon.
.FRI NIGHT...S winds 5 to 10 kt with gusts up to 20 kt, becoming
W after midnight. Seas 2 to 3 ft. Wave Detail: SE 1 foot at
4 seconds and E 1 foot at 8 seconds. A chance of showers in the
evening.
.SAT AND SAT NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: NW 1 foot at 3 seconds and SE 1 foot at 4 seconds.
.SUN THROUGH MON NIGHT...S winds 5 to 10 kt. Seas 1 foot or less.
Wave Detail: N 1 foot at 3 seconds and S 1 foot at 6 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.

$$

ANZ254-290300-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1005 AM EDT Thu Aug 28 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SE 2 ft at 9 seconds and NW 1 foot at
3 seconds.
.TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SE 2 ft at 7 seconds and W 1 foot at
3 seconds.
.FRI...S 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 1 foot at
8 seconds. A chance of showers in the afternoon.
.FRI NIGHT...S winds around 10 kt, becoming SW after midnight.
Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at
7 seconds and SW 1 foot at 3 seconds. A chance of showers in the
evening.
.SAT AND SAT NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 4 seconds and SE 2 ft at 8 seconds.
.SUN THROUGH MON NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
Wave Detail: SE 2 ft at 8 seconds and N 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.

$$

ANZ255-290300-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1005 AM EDT Thu Aug 28 2025

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

$$

ANZ256-290300-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1005 AM EDT Thu Aug 28 2025

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

$$

ANZ232-290300-
Nantucket Sound-
1005 AM EDT Thu Aug 28 2025

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

$$

ANZ233-290300-
Vineyard Sound-
1005 AM EDT Thu Aug 28 2025

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

$$

ANZ234-290300-
Buzzards Bay-
1005 AM EDT Thu Aug 28 2025

.THIS AFTERNOON...SW winds around 5 kt, increasing to 10 to 15 kt
with gusts up to 20 kt. Seas 1 foot or less, then 2 to 3 ft. Wave
Detail: SW 1 foot at 4 seconds and S 1 foot at 7 seconds,
becoming SW 2 ft at 4 seconds and S 1 foot at 7 seconds.
.TONIGHT...S winds around 10 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at
9 seconds.
.FRI...S winds around 10 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at
8 seconds. A chance of showers in the afternoon.
.FRI NIGHT...SW winds 5 to 10 kt with gusts up to 20 kt, becoming
W after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at
5 seconds and E 1 foot at 3 seconds. A chance of showers in the
evening.
.SAT...NW winds 5 to 10 kt, becoming W in the afternoon. Seas
around 2 ft. Wave Detail: W 1 foot at 4 seconds and SE 1 foot at
8 seconds.
.SAT NIGHT...W winds around 10 kt, becoming NW after midnight.
Seas around 2 ft in the evening, then 1 foot or less. Wave
Detail: SW 1 foot at 4 seconds and SE 1 foot at 8 seconds,
becoming W 1 foot at 4 seconds and S 1 foot at 5 seconds.
.SUN THROUGH MON NIGHT...SW winds 5 to 10 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.

$$

ANZ235-290300-
Rhode Island Sound-
1005 AM EDT Thu Aug 28 2025

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

$$

ANZ237-290300-
Block Island Sound-
1005 AM EDT Thu Aug 28 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at
9 seconds.
.TONIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 2 ft at 9 seconds.
.FRI...S 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 SE 1 foot at
8 seconds. A chance of showers in the afternoon.
.FRI NIGHT...W winds 5 to 10 kt, becoming NW after midnight.
Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at
4 seconds and SE 1 foot at 8 seconds. A chance of showers in the
evening.
.SAT...NW winds around 10 kt, becoming W in the afternoon. Seas
around 2 ft. Wave Detail: NW 1 foot at 3 seconds and S 1 foot at
5 seconds.
.SAT NIGHT...W winds around 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: SW 1 foot at 4 seconds and SE
1 foot at 8 seconds.
.SUN THROUGH MON NIGHT...S winds 5 to 10 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.

$$

ANZ230-290300-
Boston Harbor-
1005 AM EDT Thu Aug 28 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Waves 1 foot or less, then
around 2 ft.
.TONIGHT...S winds around 10 kt with gusts up to 25 kt. Waves
around 2 ft.
.FRI...S winds 10 to 15 kt with gusts up to 25 kt. Waves around
2 ft. A chance of showers in the morning, then showers with a
chance of tstms in the afternoon. Some tstms may produce gusty
winds and small hail in the afternoon.
.FRI NIGHT...SW winds 5 to 10 kt, becoming W after midnight.
Waves around 2 ft. Showers in the evening.
.SAT AND SAT NIGHT...NW winds 5 to 10 kt. Waves around 2 ft.
.SUN THROUGH MON NIGHT...SW winds 5 to 10 kt. Waves 1 foot or
less.

Winds and waves higher in and near tstms.

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.

$$

ANZ236-290300-
Narragansett Bay-
1005 AM EDT Thu Aug 28 2025

.THIS AFTERNOON...SW winds around 5 kt, increasing to 10 to 15 kt
with gusts up to 20 kt. Waves 2 to 3 ft.
.TONIGHT...S winds 5 to 10 kt with gusts up to 20 kt. Waves 2 to
3 ft.
.FRI...S winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Gusts up to 20 kt. Waves 2 to 3 ft. Showers likely in
the afternoon.
.FRI NIGHT...SW winds 5 to 10 kt with gusts up to 20 kt, becoming
NW after midnight. Waves around 2 ft. A chance of showers in the
evening.
.SAT...W winds 5 to 10 kt. Waves around 2 ft in the morning, then
1 foot or less.
.SAT NIGHT...NW winds 5 to 10 kt. Waves 1 foot or less.
.SUN THROUGH MON 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.

$$

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