743
FZUS51 KBOX 281106
CWFBOX

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

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

ANZ200-290000-
705 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.

$$

ANZ250-290000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
705 AM EDT Thu Aug 28 2025

.TODAY...W winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up
to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: NW 2 ft at
3 seconds and S 2 ft at 7 seconds.
.TONIGHT...S 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 E 2 ft at 8 seconds.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: SE 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 with gusts up to 20 kt, becoming
W after midnight. 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 with vsby 1 to 3 NM.
.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
5 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.

$$

ANZ251-290000-
Massachusetts Bay and Ipswich Bay-
705 AM EDT Thu Aug 28 2025

.TODAY...W winds 5 to 10 kt, becoming SE this afternoon. Seas
around 2 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 20 kt. Seas 2 to
3 ft. Wave Detail: SW 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: SE 3 ft at 4 seconds and E 1 foot at
8 seconds. A chance of showers in the morning, then showers
likely with a chance of tstms in the afternoon.
.FRI NIGHT...SW winds 10 to 15 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. Showers likely 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.

Winds and seas 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.

$$

ANZ231-290000-
Cape Cod Bay-
705 AM EDT Thu Aug 28 2025

.TODAY...W winds around 5 kt, becoming S 10 to 15 kt this
afternoon. Seas around 2 ft. Wave Detail: N 1 foot at 3 seconds
and S 1 foot at 7 seconds.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening.
Seas around 2 ft. Wave Detail: SW 1 foot at 4 seconds and E
1 foot at 9 seconds.
.FRI...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: E 1 foot at 3 seconds and SW 1 foot
at 3 seconds. A chance of showers in the afternoon.
.FRI NIGHT...SW winds 5 to 10 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. Showers likely in the evening.
.SAT AND SAT NIGHT...NW winds 5 to 10 kt. Seas 1 foot or less.
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 5 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.

$$

ANZ254-290000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
705 AM EDT Thu Aug 28 2025

.TODAY...W winds 5 to 10 kt, becoming S this afternoon. 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. Seas 2 to 3 ft. Wave Detail: SW
2 ft at 4 seconds and SE 2 ft at 8 seconds.
.FRI...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at
8 seconds.
.FRI NIGHT...SW winds around 10 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 with vsby 1 to 3 NM.
.SAT AND SAT NIGHT...W winds around 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.

$$

ANZ255-290000-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
705 AM EDT Thu Aug 28 2025

.TODAY...W winds 5 to 10 kt, becoming SW this afternoon. Seas
2 to 3 ft. Wave Detail: SW 2 ft at 6 seconds and E 2 ft at
9 seconds.
.TONIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW
3 ft at 5 seconds and E 2 ft at 8 seconds.
.FRI...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 4 ft. Wave Detail: SE 3 ft at 7 seconds and SW 2 ft at
5 seconds. A chance of showers in the afternoon.
.FRI NIGHT...SW winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: S
3 ft at 7 seconds and SW 1 foot at 3 seconds. A chance of showers
in the evening with vsby 1 to 3 NM.
.SAT AND SAT NIGHT...NW winds around 10 kt. Seas 2 to 3 ft. Wave
Detail: SW 3 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.

$$

ANZ256-290000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
705 AM EDT Thu Aug 28 2025

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

Winds and seas 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.

$$

ANZ232-290000-
Nantucket Sound-
705 AM EDT Thu Aug 28 2025

.TODAY...W winds 5 to 10 kt, becoming SW 10 to 15 kt this
afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds
and S 1 foot at 7 seconds.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after midnight.
Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and S 2 ft at
6 seconds.
.FRI...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
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...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail:
SW 2 ft at 5 seconds and E 1 foot at 3 seconds. A chance of
showers and tstms in the evening.
.SAT...W winds 10 to 15 kt. 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.

Winds and seas 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.

$$

ANZ233-290000-
Vineyard Sound-
705 AM EDT Thu Aug 28 2025

.TODAY...W winds around 5 kt, becoming SW 10 to 15 kt this
afternoon. Seas around 2 ft. Wave Detail: W 1 foot at 4 seconds
and S 1 foot at 7 seconds.
.TONIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 5 seconds and SE 1 foot at 9 seconds.
.FRI...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 4 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot
at 8 seconds. A chance of showers. A chance of tstms in the
afternoon.
.FRI NIGHT...SW winds around 10 kt, becoming W after midnight.
Seas 2 to 3 ft. Wave Detail: S 2 ft at 7 seconds. Showers likely
with a chance of tstms 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 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.

Winds and seas 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.

$$

ANZ234-290000-
Buzzards Bay-
705 AM EDT Thu Aug 28 2025

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

Winds and seas 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.

$$

ANZ235-290000-
Rhode Island Sound-
705 AM EDT Thu Aug 28 2025

.TODAY...W winds 5 to 10 kt, becoming SW 10 to 15 kt this
afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and
S 2 ft at 7 seconds.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after midnight.
Seas 2 to 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: SE 3 ft at 7 seconds and W 1 foot at
4 seconds. A chance of showers. A chance of tstms in the
afternoon.
.FRI NIGHT...SW winds 10 to 15 kt, becoming NW after midnight.
Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and W 1 foot at
3 seconds. Showers likely with a chance of tstms 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 3 seconds and S 2 ft at
7 seconds.
.SUN THROUGH MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft.

Winds and seas 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.

$$

ANZ237-290000-
Block Island Sound-
705 AM EDT Thu Aug 28 2025

.TODAY...W winds around 5 kt, becoming SW this afternoon. 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 20 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 5 seconds and SE 2 ft at 9 seconds.
A chance of showers after midnight.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SE 3 ft at 7 seconds and W 1 foot at
4 seconds. A chance of showers in the morning, then showers
likely with a chance of tstms in the afternoon.
.FRI NIGHT...SW winds 10 to 15 kt, becoming NW after midnight.
Seas 2 to 3 ft. Wave Detail: SE 2 ft at 7 seconds and W 1 foot at
3 seconds. A chance of showers and tstms in the evening.
.SAT...NW winds around 10 kt, becoming W in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 7 seconds and NW 1 foot at
3 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.

Winds and seas 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.

$$

ANZ230-290000-
Boston Harbor-
705 AM EDT Thu Aug 28 2025

.TODAY...SW winds around 5 kt, becoming SE this afternoon. Waves
1 foot or less.
.TONIGHT...S winds 10 to 15 kt. Waves around 2 ft.
.FRI...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Waves around 2 ft. A chance of showers in the morning, then
showers likely with a chance of tstms in the afternoon.
.FRI NIGHT...W winds 5 to 10 kt. Waves 1 foot or less. Showers
likely in the evening.
.SAT AND SAT NIGHT...NW winds 5 to 10 kt. Waves 1 foot or less.
.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.

$$

ANZ236-290000-
Narragansett Bay-
705 AM EDT Thu Aug 28 2025

.TODAY...W winds around 5 kt, becoming S 10 to 15 kt with gusts
up to 20 kt this afternoon. Waves around 2 ft.
.TONIGHT...S winds 10 to 15 kt. Waves around 2 ft.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft. A chance of showers in the morning, then showers likely
with a chance of tstms in the afternoon.
.FRI NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Waves around 2 ft. Showers likely with a chance of tstms 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.

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.

$$

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