Coastal Waters Forecast
Issued by NWS Boston, MA

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FZUS51 KBOX 211102
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
701 AM EDT Sun Apr 21 2024

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

ANZ200-220000-
701 AM EDT Sun Apr 21 2024

.Synopsis for Massachusetts and Rhode Island coastal waters...
A ridge of high pressure will result in dry weather today through
Tuesday with some near shore afternoon gusts into the lower 20
knots. A cold front will cross the region Wednesday into Wednesday
night with a round of showers. Small craft northwest wind gusts are
expected to follow this cold frontal passage for Thursday. A ridge
of high pressure builds in from the west by Friday.

$$

ANZ250-220000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
701 AM EDT Sun Apr 21 2024

.TODAY...W winds 10 to 15 kt with gusts up to 20 kt, becoming SW
this afternoon. Seas 2 to 4 ft. Wave Detail: W 2 ft at 3 seconds
and SE 2 ft at 7 seconds.
.TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: W 3 ft at 4 seconds and SE 2 ft at 7 seconds.
.MON...NW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and SE 2 ft at
7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NW
2 ft at 4 seconds and SE 1 ft at 7 seconds.
.TUE AND TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: NW 2 ft at 3 seconds and SE 2 ft at
7 seconds.
.WED...S winds around 15 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: SW 2 ft at 4 seconds and S 2 ft at 7 seconds.
Showers likely.
.WED NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of showers.
.THU...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to
6 ft.
.THU NIGHT...NW 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.

$$

ANZ251-220000-
Massachusetts Bay and Ipswich Bay-
701 AM EDT Sun Apr 21 2024

.TODAY...W winds 5 to 10 kt, becoming SW this afternoon. Seas
around 2 ft. Wave Detail: W 2 ft at 3 seconds and SE 1 ft at
7 seconds.
.TONIGHT...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 ft at
7 seconds.
.MON...NW winds 10 to 15 kt with gusts up to 20 kt, diminishing
to 5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: W
2 ft at 3 seconds and SE 1 ft at 7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
NW 2 ft at 3 seconds and SE 1 ft at 7 seconds.
.TUE AND TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: SE 2 ft at 7 seconds and NW 1 ft at
3 seconds.
.WED...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 ft at 4 seconds.
Showers likely.
.WED NIGHT...W winds around 15 kt with gusts up to 25 kt. Seas
3 to 4 ft. A chance of showers.
.THU AND THU NIGHT...NW winds 15 to 20 kt, becoming W 10 to
15 kt. 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.

$$

ANZ231-220000-
Cape Cod Bay-
701 AM EDT Sun Apr 21 2024

.TODAY...NW winds 5 to 10 kt, becoming SW 10 to 15 kt this
afternoon. Seas around 2 ft. Wave Detail: NW 1 ft at 3 seconds
and SE 1 ft at 7 seconds.
.TONIGHT...W winds 10 to 15 kt. Gusts up to 20 kt after midnight.
Seas around 2 ft. Wave Detail: SW 1 ft at 3 seconds and SE 1 ft
at 7 seconds.
.MON...NW winds 10 to 15 kt with gusts up to 20 kt, becoming N
5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: NW
2 ft at 3 seconds and SE 1 ft at 7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft in the evening,
then 1 foot or less. Wave Detail: NW 1 ft at 4 seconds and SE
1 ft at 7 seconds.
.TUE AND TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: N 1 ft at 4 seconds and SE 1 ft at
7 seconds.
.WED AND WED NIGHT...S winds around 15 kt, becoming W. Gusts up
to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 3 seconds and
SE 2 ft at 8 seconds. A chance of showers.
.THU AND THU NIGHT...NW winds 15 to 20 kt, diminishing to 10 to
15 kt. 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.

$$

ANZ254-220000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
701 AM EDT Sun Apr 21 2024

.TODAY...NW winds 10 to 15 kt, becoming SW this afternoon. Seas
2 to 4 ft. Wave Detail: SE 3 ft at 7 seconds and W 2 ft at
4 seconds.
.TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: W 2 ft at 4 seconds and SE 2 ft at 7 seconds.
.MON...NW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas 2 to 4 ft. Wave Detail: NW 2 ft at 4 seconds and SE 2 ft at
7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NW
2 ft at 4 seconds and SE 1 ft at 7 seconds.
.TUE AND TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: NW 1 ft at 4 seconds and SE 1 ft at
7 seconds.
.WED...S winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: S 3 ft at 8 seconds and SW 1 ft at 4 seconds.
A chance of showers.
.WED NIGHT...W winds around 15 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of showers.
.THU...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to
6 ft.
.THU NIGHT...NW winds around 15 kt with gusts up to 25 kt. Seas
3 to 5 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.

$$

ANZ255-220000-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
701 AM EDT Sun Apr 21 2024

.TODAY...NW winds 10 to 15 kt, becoming W with gusts up to 20 kt
this afternoon. Seas 2 to 4 ft. Wave Detail: SE 3 ft at 7 seconds
and W 2 ft at 4 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 SE 2 ft at 7 seconds.
.MON...NW winds 10 to 15 kt with gusts up to 20 kt, becoming W
5 to 10 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: W 3 ft
at 5 seconds and SE 2 ft at 7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SW 2 ft at 4 seconds and SE 1 ft at 7 seconds.
.TUE AND TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: SW 1 ft at 4 seconds and S 1 ft at
7 seconds.
.WED...S winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: S 4 ft at 7 seconds and SW 3 ft at 4 seconds.
A chance of showers.
.WED NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of showers.
.THU...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to
6 ft.
.THU NIGHT...NW winds around 15 kt with gusts up to 25 kt. Seas
3 to 5 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.

$$

ANZ256-220000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
701 AM EDT Sun Apr 21 2024

.TODAY...NW winds around 10 kt, becoming W with gusts up to 20 kt
this afternoon. Seas 2 to 3 ft. Wave Detail: W 2 ft at 4 seconds
and SE 2 ft at 7 seconds.
.TONIGHT...SW winds 10 to 15 kt, becoming NW after midnight.
Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at
4 seconds and SE 2 ft at 7 seconds.
.MON...NW winds 10 to 15 kt with gusts up to 20 kt, becoming W in
the afternoon. Seas around 2 ft. Wave Detail: NW 2 ft at
4 seconds and SE 2 ft at 7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W
2 ft at 4 seconds and SE 1 ft at 7 seconds.
.TUE AND TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: SW 1 ft at 4 seconds and SE 1 ft at
7 seconds.
.WED AND WED NIGHT...S winds around 15 kt, becoming W. Gusts up
to 25 kt. Seas 3 to 5 ft. Wave Detail: W 4 ft at 5 seconds and S
4 ft at 7 seconds. A chance of showers.
.THU AND THU NIGHT...NW winds 15 to 20 kt, diminishing to 10 to
15 kt. Gusts up to 25 kt. Seas 3 to 5 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.

$$

ANZ232-220000-
Nantucket Sound-
701 AM EDT Sun Apr 21 2024

.TODAY...NW winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts
up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: W 2 ft
at 3 seconds and SE 1 ft at 7 seconds.
.TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 ft at
7 seconds.
.MON...NW winds 10 to 15 kt with gusts up to 20 kt, diminishing
to 5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: W
2 ft at 3 seconds and SE 1 ft at 7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft in the evening,
then 1 foot or less. Wave Detail: SW 1 ft at 4 seconds and SE
1 ft at 7 seconds.
.TUE AND TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: W 1 ft at 4 seconds and SE 1 ft at
7 seconds.
.WED AND WED NIGHT...S winds 10 to 15 kt, becoming W. Gusts up to
25 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and S
2 ft at 8 seconds. A chance of showers.
.THU AND THU NIGHT...NW winds 15 to 20 kt, diminishing to 10 to
15 kt. 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.

$$

ANZ233-220000-
Vineyard Sound-
701 AM EDT Sun Apr 21 2024

.TODAY...NW winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts
up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: SW
2 ft at 4 seconds and SE 2 ft at 7 seconds.
.TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming
NW after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at
4 seconds and SE 1 ft at 7 seconds.
.MON...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 ft at
7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft in the evening,
then 1 foot or less. Wave Detail: SW 2 ft at 4 seconds and SE
1 ft at 7 seconds, becoming SW 1 ft at 4 seconds and SE 1 ft at
7 seconds.
.TUE AND TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: SW 1 ft at 4 seconds and S 1 ft at
7 seconds.
.WED AND WED NIGHT...S winds around 15 kt, becoming W. Gusts up
to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 5 seconds and S
2 ft at 8 seconds. A chance of showers.
.THU AND THU NIGHT...NW winds 10 to 15 kt with gusts up to 25 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.

$$

ANZ234-220000-
Buzzards Bay-
701 AM EDT Sun Apr 21 2024

.TODAY...W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts
up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: SW
2 ft at 3 seconds and SE 1 ft at 7 seconds.
.TONIGHT...W winds 10 to 15 kt. Gusts up to 20 kt in the evening.
Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 ft
at 7 seconds.
.MON...NW winds around 10 kt, becoming W in the afternoon. Seas
around 2 ft. Wave Detail: W 1 ft at 4 seconds and SE 1 ft at
7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft in the evening,
then 1 foot or less. Wave Detail: SW 1 ft at 4 seconds and SE
1 ft at 7 seconds.
.TUE AND TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: SW 1 ft at 4 seconds and SE 1 ft
at 7 seconds.
.WED AND WED NIGHT...S winds around 15 kt, becoming W. Gusts up
to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 4 seconds and S
2 ft at 8 seconds. A chance of showers.
.THU AND THU NIGHT...NW winds 10 to 15 kt with gusts up to 25 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.

$$

ANZ235-220000-
Rhode Island Sound-
701 AM EDT Sun Apr 21 2024

.TODAY...NW winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts
up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: SW
2 ft at 4 seconds and SE 2 ft at 7 seconds.
.TONIGHT...W winds 10 to 15 kt, becoming NW after midnight. Gusts
up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds
and SE 2 ft at 7 seconds.
.MON...NW winds 5 to 10 kt with gusts up to 20 kt, becoming SW in
the afternoon. Seas around 2 ft. Wave Detail: W 2 ft at 4 seconds
and SE 1 ft at 7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft in the evening,
then 1 foot or less. Wave Detail: SW 2 ft at 4 seconds and SE
1 ft at 7 seconds, becoming SW 1 ft at 4 seconds and SE 1 ft at
7 seconds.
.TUE AND TUE NIGHT...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 SE 1 ft at
7 seconds.
.WED AND WED NIGHT...S winds around 15 kt, becoming W. Gusts up
to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and S
3 ft at 8 seconds. A chance of showers.
.THU AND THU NIGHT...NW 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.

$$

ANZ237-220000-
Block Island Sound-
701 AM EDT Sun Apr 21 2024

.TODAY...NW winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts
up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: W 2 ft
at 3 seconds and SE 2 ft at 7 seconds.
.TONIGHT...W winds 10 to 15 kt, becoming NW after midnight. Seas
around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at
7 seconds.
.MON...NW winds 5 to 10 kt, becoming W in the afternoon. Seas
around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 ft at
7 seconds.
.MON NIGHT...SW winds 5 to 10 kt, becoming S after midnight. Seas
around 2 ft in the evening, then 1 foot or less. Wave Detail: SW
2 ft at 4 seconds and SE 1 ft at 7 seconds, becoming W 1 ft at
3 seconds and SE 1 ft at 7 seconds.
.TUE AND TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: SW 1 ft at 3 seconds and SE 1 ft at
7 seconds.
.WED AND WED NIGHT...S winds 10 to 15 kt, becoming NW. Gusts up
to 25 kt. Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and SE
3 ft at 8 seconds. A chance of showers.
.THU AND THU NIGHT...W 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.

$$

ANZ230-220000-
Boston Harbor-
701 AM EDT Sun Apr 21 2024

.TODAY...W winds 5 to 10 kt. Waves 1 foot or less, then around
2 ft this afternoon.
.TONIGHT...W winds around 10 kt. Gusts up to 20 kt after
midnight. Waves around 2 ft.
.MON...NW winds 5 to 10 kt. Gusts up to 20 kt in the morning.
Waves around 2 ft in the morning, then 1 foot or less.
.MON NIGHT...S winds 5 to 10 kt. Waves 1 foot or less.
.TUE AND TUE NIGHT...S winds 15 to 20 kt. Waves around 2 ft.
.WED...S winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft. Showers.
.WED NIGHT...W winds around 15 kt with gusts up to 25 kt. Waves
around 2 ft. A chance of showers.
.THU AND THU NIGHT...W winds 10 to 15 kt with gusts up to 25 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.

$$

ANZ236-220000-
Narragansett Bay-
701 AM EDT Sun Apr 21 2024

.TODAY...NW winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts
up to 20 kt this afternoon. Waves around 2 ft.
.TONIGHT...W winds 5 to 10 kt. Waves around 2 ft.
.MON...W winds 5 to 10 kt. Waves 1 foot or less.
.MON NIGHT...SW winds 5 to 10 kt, becoming S after midnight.
Waves 1 foot or less.
.TUE AND TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Waves around 2 ft.
.WED...S winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to
4 ft. Showers likely.
.WED NIGHT...NW winds around 15 kt with gusts up to 25 kt. Waves
3 to 4 ft. A chance of showers.
.THU AND THU NIGHT...NW winds 10 to 15 kt with gusts up to 25 kt.
Waves 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.

$$

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