814
FZUS51 KBOX 130205
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 PM EDT Mon May 12 2025

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

ANZ200-131500-
1005 PM EDT Mon May 12 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
A dry backdoor cold front will drop south across the waters late
tonight as high pres remains over northern New England Tue. Low pres
over the Carolinas Wed will weaken as it approaches the Northeast
Thu and Fri.

$$

ANZ250-131500-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...SW winds 15 to 20 kt, becoming NW 5 to 10 kt. Gusts
up to 25 kt. Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and
SE 2 ft at 8 seconds.
.TUE...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at
4 seconds and SE 2 ft at 8 seconds.
.TUE NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 4 seconds and SE 2 ft at 8 seconds.
.WED...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 8 seconds and E 1 foot at 4 seconds.
.WED NIGHT AND THU...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: SE 2 ft at 4 seconds and SE 2 ft at 7 seconds. A chance
of showers.
.THU NIGHT...S winds around 5 kt. Seas 2 to 3 ft. Wave Detail: SE
2 ft at 8 seconds and E 1 foot at 4 seconds.
.FRI...S winds 5 to 10 kt. Seas 2 to 3 ft.
.FRI NIGHT AND SAT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance
of showers.
.SAT NIGHT...S winds around 10 kt. Seas 2 to 3 ft. Showers
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.

$$

ANZ251-131500-
Massachusetts Bay and Ipswich Bay-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...SW winds 10 to 15 kt, becoming NW 5 to 10 kt. Gusts
up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds
and E 1 foot at 4 seconds.
.TUE...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft
at 3 seconds and E 2 ft at 8 seconds.
.TUE NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 4 seconds and SE 1 foot at 8 seconds.
.WED...SE winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: E
1 foot at 4 seconds and SE 1 foot at 8 seconds.
.WED NIGHT AND THU...E winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 1 foot at 4 seconds and SE 1 foot at 8 seconds. A
chance of showers.
.THU NIGHT...SE winds around 5 kt, becoming S around 5 kt after
midnight. Seas around 2 ft. Wave Detail: E 1 foot at 4 seconds
and SE 1 foot at 7 seconds.
.FRI...S winds 5 to 10 kt. Seas around 2 ft.
.FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.
.SAT...S winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.SAT NIGHT...S winds around 10 kt. Seas around 2 ft. Showers
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.

$$

ANZ231-131500-
Cape Cod Bay-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt. Gusts
up to 20 kt. Seas around 2 ft. Wave Detail: W 2 ft at 4 seconds
and N 1 foot at 4 seconds.
.TUE...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N
1 foot at 3 seconds and SW 1 foot at 4 seconds.
.TUE NIGHT...SE winds 5 to 10 kt. Seas around 2 ft in the
evening, then 1 foot or less. Wave Detail: SE 1 foot at 4 seconds
and SE 1 foot at 8 seconds.
.WED...SE winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SE
1 foot at 4 seconds and SE 1 foot at 8 seconds.
.WED NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 1 foot at 3 seconds and SE 1 foot at 8 seconds. A chance of
showers after midnight.
.THU...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft
at 7 seconds and SE 1 foot at 2 seconds. A chance of showers.
.THU NIGHT...S winds around 5 kt. Seas around 2 ft.
.FRI...S winds 5 to 10 kt. Seas around 2 ft.
.FRI NIGHT THROUGH SAT NIGHT...S winds 5 to 10 kt. Seas around
2 ft. A chance of showers.

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.

$$

ANZ254-131500-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt. Gusts
up to 25 kt. Seas 2 to 3 ft. Wave Detail: W 3 ft at 5 seconds and
SE 2 ft at 8 seconds.
.TUE...NE winds 5 to 10 kt, becoming E in the afternoon. Seas
2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SW 1 foot at
4 seconds.
.TUE NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 4 seconds and SE 2 ft at 8 seconds.
.WED...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft
at 4 seconds and SE 2 ft at 8 seconds.
.WED NIGHT...SE winds around 10 kt. Seas 2 to 4 ft. Wave Detail:
S 3 ft at 8 seconds and SE 2 ft at 4 seconds. A chance of showers
after midnight.
.THU...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft
at 8 seconds and E 1 foot at 5 seconds. A chance of showers.
.THU NIGHT...S winds 5 to 10 kt. Seas 3 to 4 ft.
.FRI...S winds 5 to 10 kt. Seas 2 to 4 ft.
.FRI NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers.
.SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas 2 to 4 ft. A chance
of showers.

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.

$$

ANZ255-131500-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: W 3 ft at 4 seconds and SE 2 ft at
8 seconds.
.TUE...NE winds 5 to 10 kt, becoming E in the afternoon. Seas
around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at
8 seconds. Patchy fog in the morning.
.TUE NIGHT...SE winds around 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 3 seconds and SE 2 ft at 8 seconds.
.WED...SE winds around 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds and E 2 ft at 4 seconds.
.WED NIGHT...SE winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail: S
4 ft at 7 seconds and E 2 ft at 4 seconds. A chance of showers in
the evening, then showers likely after midnight.
.THU...S winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: S 5 ft at
8 seconds and E 1 foot at 4 seconds. A chance of showers.
.THU NIGHT...S winds around 5 kt. Seas 3 to 5 ft.
.FRI...S winds 5 to 10 kt. Seas 3 to 4 ft.
.FRI NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. A chance of
showers.
.SAT...SW winds 5 to 10 kt. Seas 2 to 3 ft.
.SAT NIGHT...S winds 10 to 15 kt. Seas 3 to 4 ft. A chance of
showers.

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.

$$

ANZ256-131500-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...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
8 seconds.
.TUE...N winds 5 to 10 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 4 seconds and SE 2 ft at
8 seconds.
.TUE NIGHT...SE winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
SE 2 ft at 3 seconds and SE 2 ft at 8 seconds.
.WED...SE winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft
at 8 seconds and SE 2 ft at 4 seconds. A chance of showers in the
afternoon.
.WED NIGHT AND THU...SE winds 10 to 15 kt. Seas 4 to 5 ft. Wave
Detail: S 5 ft at 8 seconds and E 2 ft at 4 seconds. Showers
likely. A chance of showers in the afternoon.
.THU NIGHT...S winds around 5 kt. Seas 3 to 5 ft. Wave Detail: S
5 ft at 8 seconds.
.FRI...S winds 5 to 10 kt. Seas 3 to 4 ft.
.FRI NIGHT THROUGH SAT NIGHT...SW winds 10 to 15 kt. Seas 3 to
4 ft. A chance of showers.

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.

$$

ANZ232-131500-
Nantucket Sound-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas
around 2 ft. Wave Detail: W 2 ft at 4 seconds and N 1 foot at
5 seconds.
.TUE...NE winds 5 to 10 kt, becoming E in the afternoon. Seas
1 foot or less, then around 2 ft in the afternoon. Wave Detail:
NE 1 foot at 4 seconds and W 1 foot at 4 seconds, becoming E
1 foot at 3 seconds and SW 1 foot at 4 seconds.
.TUE NIGHT...SE winds 5 to 10 kt. Seas around 2 ft in the
evening, then 1 foot or less. Wave Detail: SE 1 foot at 4 seconds
and SE 1 foot at 8 seconds.
.WED...SE winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft
in the afternoon. Wave Detail: SE 1 foot at 4 seconds and SE
1 foot at 8 seconds, becoming SE 1 foot at 4 seconds and S 1 foot
at 7 seconds.
.WED NIGHT...SE winds around 10 kt. Seas around 2 ft. Wave
Detail: S 2 ft at 7 seconds and SE 1 foot at 4 seconds. A chance
of showers.
.THU...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 7 seconds and E 1 foot at 4 seconds. A chance of showers.
.THU NIGHT...S winds around 5 kt. Seas around 2 ft.
.FRI...S winds 5 to 10 kt. Seas around 2 ft.
.FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.
.SAT...SW winds 5 to 10 kt. Seas around 2 ft.
.SAT NIGHT...S winds around 10 kt. Seas around 2 ft. A chance of
showers.

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.

$$

ANZ233-131500-
Vineyard Sound-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt. Seas around 2 ft. Wave Detail: W 2 ft at
4 seconds and SE 1 foot at 8 seconds.
.TUE...NE winds 5 to 10 kt, becoming E in the afternoon. Seas
1 foot or less, then around 2 ft in the afternoon. Wave Detail:
NE 1 foot at 2 seconds and W 1 foot at 3 seconds, becoming E
1 foot at 2 seconds and SW 1 foot at 4 seconds.
.TUE NIGHT...SE winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: SE 1 foot at 4 seconds and SE 1 foot at 8 seconds.
.WED...SE winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft
in the afternoon. Wave Detail: SE 1 foot at 4 seconds and SE
1 foot at 8 seconds, becoming S 2 ft at 7 seconds and SE 1 foot
at 3 seconds.
.WED NIGHT...SE winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
S 3 ft at 7 seconds and SE 1 foot at 3 seconds. A chance of
showers in the evening, then showers likely after midnight.
.THU...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft
at 8 seconds and SE 1 foot at 3 seconds. A chance of showers.
.THU NIGHT...S winds around 5 kt. Seas 2 to 3 ft.
.FRI...S winds 5 to 10 kt. Seas around 2 ft.
.FRI NIGHT THROUGH SAT NIGHT...SW winds 5 to 10 kt. Seas around
2 ft. A chance of showers.

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.

$$

ANZ234-131500-
Buzzards Bay-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt. Seas around 2 ft. Wave Detail: W 2 ft at
4 seconds and SE 1 foot at 8 seconds.
.TUE...NE winds 5 to 10 kt, becoming E in the afternoon. Seas
1 foot or less. Wave Detail: NE 1 foot at 2 seconds and W 1 foot
at 4 seconds.
.TUE NIGHT...SE winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: S 1 foot at 3 seconds and SE 1 foot at 8 seconds.
.WED...SE winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft
in the afternoon. Wave Detail: SE 1 foot at 3 seconds and SE
1 foot at 8 seconds, becoming SE 1 foot at 3 seconds and S 1 foot
at 7 seconds.
.WED NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
S 2 ft at 8 seconds and SE 1 foot at 4 seconds. A chance of
showers in the evening, then showers likely after midnight.
.THU...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft
at 8 seconds and SE 1 foot at 4 seconds. A chance of showers.
.THU NIGHT...S winds around 5 kt. Seas around 2 ft.
.FRI...S winds 5 to 10 kt. Seas around 2 ft.
.FRI NIGHT THROUGH SAT NIGHT...SW winds 5 to 10 kt. Seas around
2 ft. A chance of showers.

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.

$$

ANZ235-131500-
Rhode Island Sound-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at
4 seconds and SE 2 ft at 8 seconds.
.TUE...NE winds 5 to 10 kt, becoming E in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 4 seconds and SE 2 ft at
8 seconds.
.TUE NIGHT...SE winds around 10 kt. Seas around 2 ft. Wave
Detail: S 2 ft at 4 seconds and SE 2 ft at 8 seconds.
.WED...SE winds around 10 kt. Seas 2 to 3 ft. Wave Detail: SE
2 ft at 4 seconds and S 2 ft at 7 seconds.
.WED NIGHT AND THU...SE winds 5 to 10 kt. Seas 2 to 4 ft. Wave
Detail: S 4 ft at 8 seconds and SE 2 ft at 4 seconds. Showers
likely. A chance of showers in the afternoon.
.THU NIGHT...S winds around 5 kt. Seas 2 to 4 ft. Wave Detail: S
4 ft at 8 seconds.
.FRI...S winds 5 to 10 kt. Seas 2 to 3 ft.
.FRI NIGHT THROUGH SAT NIGHT...SW winds 5 to 10 kt. Seas 2 to
3 ft. A chance of showers.

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.

$$

ANZ237-131500-
Block Island Sound-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at
4 seconds and SE 2 ft at 8 seconds.
.TUE...NE winds 5 to 10 kt, becoming E in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 3 seconds and SE 2 ft at
8 seconds.
.TUE NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 3 seconds and SE 2 ft at 8 seconds.
.WED...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at
7 seconds and E 2 ft at 4 seconds. A chance of showers in the
afternoon.
.WED NIGHT AND THU...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: S 4 ft at 8 seconds and E 2 ft at 4 seconds. Showers
likely. A chance of showers in the afternoon.
.THU NIGHT...S winds around 5 kt. Seas 2 to 4 ft. Wave Detail: S
4 ft at 8 seconds.
.FRI...S winds around 5 kt. Seas 2 to 3 ft.
.FRI NIGHT THROUGH SAT NIGHT...SW winds 5 to 10 kt. Seas 2 to
3 ft. A chance of showers.

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.

$$

ANZ230-131500-
Boston Harbor-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming N 5 to 10 kt. Waves 1 foot or less.
.TUE...E winds 5 to 10 kt. Waves 1 foot or less, then around 2 ft
in the afternoon.
.TUE NIGHT...E winds 5 to 10 kt. Waves 1 foot or less.
.WED...SE winds 5 to 10 kt. Waves 1 foot or less.
.WED NIGHT...SE winds 5 to 10 kt. Waves 1 foot or less. A chance
of showers.
.THU AND THU NIGHT...S winds around 5 kt. Waves 1 foot or less. A
chance of showers.
.FRI...S winds 5 to 10 kt. Waves 1 foot or less.
.FRI NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. A chance
of showers.
.SAT...S winds 5 to 10 kt. Waves 1 foot or less. A chance of
showers.
.SAT NIGHT...SW winds around 10 kt. Waves 1 foot or less. Showers
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.

$$

ANZ236-131500-
Narragansett Bay-
1005 PM EDT Mon May 12 2025

.OVERNIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt. Waves around
2 ft.
.TUE...NE winds 5 to 10 kt, becoming SE in the afternoon. Waves
1 foot or less, then around 2 ft in the afternoon.
.TUE NIGHT...SE winds 5 to 10 kt. Waves around 2 ft.
.WED...SE winds 5 to 10 kt. Waves 2 to 3 ft.
.WED NIGHT AND THU...SE winds 5 to 10 kt. Waves 2 to 4 ft.
Showers likely. A chance of showers in the afternoon.
.THU NIGHT...S winds around 5 kt. Waves 2 to 3 ft.
.FRI...S winds 5 to 10 kt. Waves 2 to 3 ft.
.FRI NIGHT THROUGH SAT NIGHT...SW winds 5 to 10 kt. Waves around
2 ft. A chance of showers.

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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