917
FZUS51 KBOX 211804
CWFBOX

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

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

ANZ200-220700-
104 PM EST Fri Nov 21 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pressure moves south of the waters today ahead of an
approaching cold front, which may bring showers to the southern
waters. High pressure returns late Saturday and remains through
early next week.

$$

ANZ250-220700-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...SW winds around 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot
at 7 seconds.
.TONIGHT...W 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 7 seconds.
.SAT...NW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: NW 2 ft at 3 seconds and E 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 AND SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: N 2 ft at 5 seconds and E 2 ft at
7 seconds.
.MON AND MON NIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: NW 2 ft at 4 seconds and E 1 foot at
7 seconds.
.TUE...SW winds around 10 kt. Seas around 2 ft. A chance of rain.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 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.

$$

ANZ251-220700-
Massachusetts Bay and Ipswich Bay-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...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 E 1 foot at
3 seconds.
.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 E 2 ft at 7 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: NW
2 ft at 3 seconds and E 2 ft at 7 seconds.
.SAT NIGHT...NW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: N 2 ft at 3 seconds and E 2 ft at
7 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: N 2 ft at 4 seconds and E 1 foot at 7 seconds.
.MON AND MON NIGHT...NW winds 10 to 15 kt, diminishing to 5 to
10 kt. Seas 2 to 3 ft. Wave Detail: W 2 ft at 3 seconds and E
1 foot at 7 seconds.
.TUE...SW winds 5 to 10 kt. Seas around 2 ft. A chance of rain.
.TUE NIGHT...S winds around 10 kt. Seas 2 to 3 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.

$$

ANZ231-220700-
Cape Cod Bay-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: SW 1 foot at 2 seconds and NE 1 foot
at 3 seconds.
.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 3 seconds and E 1 foot at 7 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: N 2 ft at
3 seconds and E 1 foot at 7 seconds. A chance of 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: N 2 ft at 4 seconds and E 1 foot at
7 seconds.
.SUN AND SUN NIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: N 2 ft at 5 seconds and SE 1 foot at 7 seconds.
.MON AND MON NIGHT...NW winds 10 to 15 kt, diminishing to 5 to
10 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and SE
1 foot at 7 seconds.
.TUE...SW winds 5 to 10 kt. Seas 1 foot or less. A chance of
rain.
.TUE NIGHT...S winds around 10 kt. Seas around 2 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.

$$

ANZ254-220700-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...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 SE 2 ft at
6 seconds.
.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 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 4 ft. Wave Detail: NW 2 ft
at 4 seconds and E 2 ft at 7 seconds. Showers likely, 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: N 3 ft at 4 seconds and E 2 ft at
7 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Seas 2 to 4 ft. Wave
Detail: S 3 ft at 7 seconds and N 2 ft at 5 seconds.
.MON THROUGH TUE...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: N 3 ft at 5 seconds and SE 2 ft at
7 seconds.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 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.

$$

ANZ255-220700-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...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 2 ft at
6 seconds.
.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 5 seconds and E 2 ft 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 4 ft. Wave Detail: W 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: SE 3 ft at 7 seconds and N 2 ft at
4 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and S 3 ft at
7 seconds.
.MON AND MON NIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: W 4 ft at 6 seconds and NE 1 foot at
5 seconds.
.TUE...S winds 10 to 15 kt. Seas around 2 ft.
.TUE NIGHT...S winds 10 to 15 kt with gusts up 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.

$$

ANZ256-220700-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds.
.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. 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 4 ft. Wave Detail: N 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: N 2 ft at 4 seconds and E 2 ft at
7 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and S 3 ft at
7 seconds.
.MON AND MON NIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: NW 3 ft at 5 seconds and SE 2 ft at
8 seconds.
.TUE...S winds 10 to 15 kt. Seas 2 to 3 ft. A chance of rain.
.TUE NIGHT...S winds around 15 kt with gusts up 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.

$$

ANZ232-220700-
Nantucket Sound-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...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 E 1 foot at
5 seconds.
.TONIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 3 seconds and E 1 foot at 5 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: N 2 ft at
3 seconds and E 1 foot at 6 seconds. Showers likely, 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: N 2 ft at 4 seconds and E 1 foot at
7 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: W 2 ft at 3 seconds and NE 1 foot at 4 seconds.
.MON THROUGH TUE...SW 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 NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 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.

$$

ANZ233-220700-
Vineyard Sound-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: S 2 ft at 5 seconds.
.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 4 seconds and SE 1 foot at 6 seconds. A chance
of showers after midnight.
.SAT...N winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: NW 1 foot at 4 seconds and E
1 foot at 6 seconds. Showers likely 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: N
1 foot at 3 seconds and E 1 foot at 6 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 4 seconds and N 1 foot at 4 seconds.
.MON AND MON NIGHT...NW winds 10 to 15 kt, diminishing to 5 to
10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 6 seconds and SE
1 foot at 9 seconds.
.TUE...S winds 10 to 15 kt. Seas around 2 ft. A chance of rain.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 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.

$$

ANZ234-220700-
Buzzards Bay-
104 PM EST Fri Nov 21 2025

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

$$

ANZ235-220700-
Rhode Island Sound-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds.
.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 SE 1 foot at 6 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 3 ft. Wave Detail: W 2 ft
at 5 seconds and SE 1 foot at 6 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: N 2 ft at 3 seconds and S 2 ft at
7 seconds.
.SUN AND SUN 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 S 2 ft at
7 seconds.
.MON AND MON NIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 6 seconds and SE 1 foot
at 9 seconds.
.TUE...S winds 10 to 15 kt. Seas around 2 ft. A chance of rain.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 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.

$$

ANZ237-220700-
Block Island Sound-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...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 SE 1 foot
at 6 seconds.
.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 4 seconds and SE 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 2 to 3 ft. Wave Detail: NW 1 foot at 3 seconds and SE 1 foot
at 6 seconds. Showers likely 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: N
1 foot at 3 seconds and E 1 foot at 7 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: W 2 ft at 3 seconds and S 2 ft at 7 seconds.
.MON AND MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: W 2 ft at
3 seconds and S 2 ft at 6 seconds.
.TUE...S winds 10 to 15 kt. Seas around 2 ft. A chance of rain.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 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.

$$

ANZ230-220700-
Boston Harbor-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...SW winds around 10 kt with gusts up to 20 kt.
Waves around 2 ft.
.TONIGHT...W winds 5 to 10 kt. Gusts up to 20 kt in the 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 AND SUN NIGHT...W winds 5 to 10 kt. Waves 1 foot or less.
.MON AND MON NIGHT...W winds 5 to 10 kt. Waves around 2 ft, then
1 foot or less.
.TUE...SW winds 5 to 10 kt. Waves 1 foot or less. A chance of
rain.
.TUE NIGHT...S winds around 10 kt. Waves 1 foot or less. 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.

$$

ANZ236-220700-
Narragansett Bay-
104 PM EST Fri Nov 21 2025

.THIS AFTERNOON...SW winds around 10 kt with gusts up to 20 kt.
Waves 2 to 3 ft.
.TONIGHT...W winds 5 to 10 kt. Gusts up to 20 kt in the evening.
Waves around 2 ft. A chance of showers after midnight.
.SAT...N winds 5 to 10 kt. Waves around 2 ft. Showers likely 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 AND SUN NIGHT...W winds 5 to 10 kt. Waves around 2 ft.
.MON AND MON NIGHT...NW winds 5 to 10 kt. Waves 2 to 3 ft.
.TUE...S winds 5 to 10 kt. Waves around 2 ft. A chance of rain.
.TUE NIGHT...S winds 10 to 15 kt. Waves 2 to 4 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.

$$

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