865
FZUS51 KBOX 212105
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
404 PM EST Fri Nov 21 2025

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

ANZ200-221000-
404 PM EST Fri Nov 21 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pressure moves south of the waters into tonight. Cold front
moves through tonight which may bring showers to the southern
waters. High pres returns late Saturday and remains through early
next week. High pres moves offshore Tuesday. Rain possible late
Tuesday into Thursday with a frontal system.

$$

ANZ250-221000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
404 PM EST Fri Nov 21 2025

.TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SE 3 ft at 6 seconds.
.SAT...NW winds 10 to 15 kt. 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.
.SAT NIGHT...NW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail:
NW 3 ft at 4 seconds and E 2 ft at 7 seconds.
.SUN...W winds around 10 kt. Seas 2 to 4 ft. Wave Detail: NW 2 ft
at 4 seconds and E 1 foot at 7 seconds.
.SUN NIGHT THROUGH MON NIGHT...W 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 E
1 foot at 7 seconds.
.TUE...SW winds around 10 kt. Seas around 2 ft. Wave Detail: W
2 ft at 3 seconds and SE 1 foot at 3 seconds. A chance of rain.
.TUE NIGHT AND WED...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Rain likely.
.WED NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. A chance of rain.

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.

$$

ANZ251-221000-
Massachusetts Bay and Ipswich Bay-
404 PM EST Fri Nov 21 2025

.TONIGHT...W 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 S 1 foot at
5 seconds.
.SAT...NW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SE
2 ft at 6 seconds and W 1 foot at 2 seconds.
.SAT NIGHT...NW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: NW 2 ft at 3 seconds and E 2 ft at
7 seconds.
.SUN...W winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NW 2 ft
at 3 seconds and NE 1 foot at 6 seconds.
.SUN NIGHT THROUGH MON NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Seas around 2 ft. Wave Detail: W 2 ft at 3 seconds and
SE 1 foot at 7 seconds.
.TUE...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
1 foot at 3 seconds and W 1 foot at 3 seconds. A chance of rain.
.TUE NIGHT AND WED...S winds around 10 kt. Seas around 2 ft. Rain
likely.
.WED NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. A chance of rain.

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.

$$

ANZ231-221000-
Cape Cod Bay-
404 PM EST Fri Nov 21 2025

.TONIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW
1 foot at 2 seconds and SE 1 foot at 6 seconds. A chance of
showers after midnight.
.SAT...NW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: NW 1 foot
at 3 seconds and S 1 foot at 5 seconds. Showers likely in the
morning with vsby 1 to 3 NM.
.SAT NIGHT...NW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: NW 2 ft at 4 seconds and S 1 foot at
4 seconds.
.SUN...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 2 ft
at 5 seconds and S 1 foot at 7 seconds.
.SUN NIGHT THROUGH MON NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Seas around 2 ft. Wave Detail: W 2 ft at 3 seconds and
NE 1 foot at 5 seconds.
.TUE...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W
1 foot at 6 seconds and E 1 foot at 9 seconds. A chance of rain.
.TUE NIGHT AND WED...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
around 2 ft. Rain likely.
.WED NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. A chance of rain.

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.

$$

ANZ254-221000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
404 PM EST Fri Nov 21 2025

.TONIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 4 seconds and E 2 ft at 7 seconds. A slight chance of showers
this evening. Showers likely after midnight.
.SAT...NW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: NW 2 ft
at 3 seconds and E 2 ft at 7 seconds. Showers, mainly in the
morning with vsby 1 NM or less.
.SAT NIGHT...NW winds 10 to 15 kt with gusts up to 25 kt. Seas
3 to 5 ft. Wave Detail: NW 3 ft at 4 seconds and E 2 ft at
7 seconds.
.SUN...W winds 5 to 10 kt, becoming SW 10 to 15 kt in the
afternoon. Seas 2 to 4 ft. Wave Detail: NW 2 ft at 5 seconds and
NE 2 ft at 7 seconds.
.SUN NIGHT THROUGH MON NIGHT...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
NE 2 ft at 6 seconds.
.TUE...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: W
2 ft at 5 seconds and N 2 ft at 6 seconds.
.TUE NIGHT AND WED...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Rain likely.
.WED NIGHT...SW winds 15 to 20 kt. Seas 3 to 5 ft. Rain likely.

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.

$$

ANZ255-221000-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
404 PM EST Fri Nov 21 2025

.TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt, becoming
W 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft
at 6 seconds and E 2 ft at 6 seconds. A slight chance of showers
this evening. A chance of showers after midnight.
.SAT...N winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SW
2 ft at 5 seconds and E 2 ft at 7 seconds. Showers, mainly in the
morning with vsby 1 NM or less.
.SAT NIGHT...N winds 10 to 15 kt with gusts up to 25 kt. Seas
3 to 5 ft. Wave Detail: NW 2 ft at 4 seconds and E 2 ft at
7 seconds.
.SUN...NW winds 5 to 10 kt, becoming W 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: W 3 ft at
4 seconds and NE 2 ft at 6 seconds.
.SUN NIGHT THROUGH MON NIGHT...NW winds 15 to 20 kt. Seas 2 to
4 ft. Wave Detail: W 4 ft at 6 seconds and E 1 foot at 7 seconds.
.TUE...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 5 seconds and N 1 foot at 4 seconds.
.TUE NIGHT AND WED...S winds 15 to 20 kt. Seas 3 to 5 ft. Rain
likely.
.WED NIGHT...W winds 20 to 25 kt. Seas 4 to 6 ft. Rain likely.

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.

$$

ANZ256-221000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
404 PM EST Fri Nov 21 2025

.TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: SW 3 ft at 5 seconds and E 2 ft at 7 seconds. A chance of
showers after midnight.
.SAT...N winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SW
2 ft at 4 seconds and E 2 ft at 7 seconds. Showers in the morning
with vsby 1 to 3 NM.
.SAT NIGHT...N winds 10 to 15 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: NW 3 ft at 4 seconds and E 2 ft at
7 seconds.
.SUN...NW winds 5 to 10 kt, becoming W 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: W 3 ft at
4 seconds and S 2 ft at 7 seconds.
.SUN NIGHT THROUGH MON NIGHT...W winds 15 to 20 kt with gusts up
to 25 kt. Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and SW
3 ft at 7 seconds.
.TUE...S winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: S 2 ft at 4 seconds and N 1 foot at 3 seconds.
A chance of rain.
.TUE NIGHT AND WED...SW winds 15 to 20 kt with gusts up to 25 kt.
Seas 3 to 5 ft. Rain.
.WED NIGHT...W winds 20 to 25 kt. Seas 4 to 6 ft. A chance of
rain.

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.

$$

ANZ232-221000-
Nantucket Sound-
404 PM EST Fri Nov 21 2025

.TONIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW
1 foot at 3 seconds and SE 1 foot at 6 seconds. A slight chance
of showers this evening. Showers likely after midnight.
.SAT...NW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 1 foot
at 4 seconds and E 1 foot at 7 seconds. Showers, mainly in the
morning with vsby 1 to 3 NM.
.SAT NIGHT...NW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: NW 2 ft at 3 seconds and E 1 foot at
7 seconds.
.SUN...NW winds 5 to 10 kt, becoming SW 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: W 2 ft at 3 seconds and
NE 1 foot at 6 seconds.
.SUN NIGHT THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up
to 20 kt. Seas around 2 ft. Wave Detail: W 2 ft at 3 seconds and
SW 2 ft at 6 seconds.
.TUE...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 3 seconds and N 1 foot at 4 seconds.
.TUE NIGHT AND WED...S winds 15 to 20 kt. Seas 2 to 3 ft. Rain
likely.
.WED NIGHT...W winds 15 to 20 kt. Seas 2 to 3 ft. A chance of
rain.

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.

$$

ANZ233-221000-
Vineyard Sound-
404 PM EST Fri Nov 21 2025

.TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 5 seconds and E 1 foot at 6 seconds. Showers
likely after midnight.
.SAT...N winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: SW 1 foot at 5 seconds and E
1 foot at 6 seconds. Showers in the morning with vsby 1 to 3 NM.
.SAT NIGHT...NW winds 10 to 15 kt, diminishing to 5 to 10 kt
after midnight. Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail:
NW 1 foot at 3 seconds and S 1 foot at 6 seconds.
.SUN...NW winds 5 to 10 kt, becoming W 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and
NE 1 foot at 6 seconds.
.SUN NIGHT THROUGH MON NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and
SW 2 ft at 7 seconds.
.TUE...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 5 seconds and N 1 foot at 4 seconds. A chance of rain.
.TUE NIGHT AND WED...S winds 15 to 20 kt. Seas 2 to 3 ft. Rain
likely.
.WED NIGHT...W winds 15 to 20 kt. Seas 2 to 4 ft. A chance of
rain.

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.

$$

ANZ234-221000-
Buzzards Bay-
404 PM EST Fri Nov 21 2025

.TONIGHT...W winds 5 to 10 kt. Gusts up to 20 kt this evening.
Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and E 1 foot
at 6 seconds. Showers likely after midnight.
.SAT...N winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: SW 1 foot at 5 seconds and E
1 foot at 6 seconds. Showers in the morning with vsby 1 to 3 NM.
.SAT NIGHT...NW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: NW 1 foot at 2 seconds and
S 1 foot at 4 seconds.
.SUN...NW winds 5 to 10 kt, becoming SW 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds
and NE 1 foot at 6 seconds.
.SUN NIGHT THROUGH MON NIGHT...W winds 10 to 15 kt. Seas around
2 ft. Wave Detail: SW 2 ft at 4 seconds and SW 2 ft at 7 seconds.
.TUE...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 5 seconds and N 1 foot at 4 seconds. A chance of rain.
.TUE NIGHT AND WED...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Rain likely.
.WED NIGHT...W winds 15 to 20 kt. Seas 2 to 3 ft. A chance of
rain.

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.

$$

ANZ235-221000-
Rhode Island Sound-
404 PM EST Fri Nov 21 2025

.TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 5 seconds and SE 1 foot at 6 seconds. Showers
likely after midnight.
.SAT...N winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW
1 foot at 4 seconds and SE 1 foot at 6 seconds. Showers in the
morning with vsby 1 to 3 NM.
.SAT NIGHT...NW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: NW 2 ft at 3 seconds and S 1 foot at
4 seconds.
.SUN...NW winds 5 to 10 kt, becoming W 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: W 2 ft at
4 seconds and S 2 ft at 7 seconds.
.SUN NIGHT THROUGH MON NIGHT...W 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 W
2 ft at 4 seconds.
.TUE...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 4 seconds and SE 1 foot at 9 seconds. A chance of rain.
.TUE NIGHT AND WED...SW winds 15 to 20 kt. Seas 2 to 4 ft. Rain
likely.
.WED NIGHT...W winds 15 to 20 kt. Seas 3 to 5 ft. A chance of
rain.

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.

$$

ANZ237-221000-
Block Island Sound-
404 PM EST Fri Nov 21 2025

.TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: W 2 ft at 3 seconds and SE 2 ft at 6 seconds. Showers
likely after midnight.
.SAT...N winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: W 1 foot at 3 seconds and SE 1 foot
at 6 seconds. Showers in the morning with vsby 1 to 3 NM.
.SAT NIGHT...NW winds 10 to 15 kt, becoming N 5 to 10 kt after
midnight. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: NW
1 foot at 3 seconds and SE 1 foot at 5 seconds.
.SUN...NW winds 5 to 10 kt, becoming W 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: W 2 ft at 3 seconds and S
2 ft at 7 seconds.
.SUN NIGHT THROUGH MON NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Seas 2 to 3 ft. Wave Detail: W 2 ft at 3 seconds and SE
2 ft at 8 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 SW 1 foot at
6 seconds. A chance of rain.
.TUE NIGHT AND WED...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Rain likely.
.WED NIGHT...W winds 15 to 20 kt. Seas 3 to 4 ft. A chance of
rain.

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.

$$

ANZ230-221000-
Boston Harbor-
404 PM EST Fri Nov 21 2025

.TONIGHT...W winds 5 to 10 kt. Gusts up to 20 kt this evening.
Waves around 2 ft.
.SAT...NW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Waves 1 foot or less, then around 2 ft in the afternoon.
.SAT NIGHT...NW winds 5 to 10 kt with gusts up to 20 kt. Waves
around 2 ft.
.SUN...W winds 5 to 10 kt. Waves 1 foot or less.
.SUN NIGHT THROUGH MON NIGHT...W winds 10 to 15 kt. Waves around
2 ft.
.TUE...SW winds 5 to 10 kt. Waves around 2 ft. A chance of rain.
.TUE NIGHT AND WED...S winds around 10 kt. Waves 1 foot or less,
then around 2 ft. Rain likely.
.WED NIGHT...W winds 10 to 15 kt. Waves around 2 ft. A chance of
rain.

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.

$$

ANZ236-221000-
Narragansett Bay-
404 PM EST Fri Nov 21 2025

.TONIGHT...W winds 5 to 10 kt. Gusts up to 20 kt this evening.
Waves around 2 ft. Showers likely after midnight.
.SAT...N winds 5 to 10 kt. Waves around 2 ft. Showers in the
morning with vsby 1 to 3 NM.
.SAT NIGHT...NW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Waves around 2 ft.
.SUN...W winds 5 to 10 kt, becoming SW in the afternoon. Waves
around 2 ft.
.SUN NIGHT THROUGH MON NIGHT...W winds 5 to 10 kt. Waves around
2 ft.
.TUE...SW winds 10 to 15 kt. Waves around 2 ft. A chance of rain.
.TUE NIGHT AND WED...SW winds 10 to 15 kt with gusts up to 20 kt.
Waves 2 to 3 ft. Rain likely.
.WED NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Waves
2 to 4 ft. A chance of rain.

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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