048
FZUS51 KBOX 221405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Mon Sep 22 2025

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

ANZ200-230300-
1005 AM EDT Mon Sep 22 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pres moves offshore today bringing increasing SW winds thru the
day. Chance for showers and thunderstorms Tue. High pres may return
for Wed before another system approaches Fri and Sat.

$$

ANZ250-230300-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1005 AM EDT Mon Sep 22 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
WEDNESDAY EVENING...

.THIS AFTERNOON...SE winds around 5 kt, increasing to 5 to 10 kt.
Seas 2 to 4 ft. Wave Detail: SE 4 ft at 11 seconds and SE 2 ft at
5 seconds.
.TONIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 3 to 5 ft. Wave Detail: SE 5 ft at 11 seconds and
S 2 ft at 3 seconds.
.TUE...SW winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail: SE 5 ft
at 11 seconds and SW 2 ft at 3 seconds.
.TUE NIGHT...SW winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: SE
5 ft at 12 seconds and SW 1 foot at 3 seconds. A chance of
showers in the evening. Showers likely after midnight. Vsby 1 to
3 NM.
.WED...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft. Wave Detail: SE 5 ft at 12 seconds and NE 3 ft at
4 seconds. Showers likely. Vsby 1 to 3 NM in the morning.
.WED NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 11 seconds and
NE 3 ft at 5 seconds. A chance of showers.
.THU AND THU NIGHT...E winds around 10 kt, becoming S. Seas 2 to
4 ft. A chance of showers.
.FRI AND FRI NIGHT...S winds 10 to 15 kt. Gusts up to 20 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.

$$

ANZ251-230300-
Massachusetts Bay and Ipswich Bay-
1005 AM EDT Mon Sep 22 2025

.THIS AFTERNOON...NE winds around 5 kt, becoming SE. Seas around
2 ft. Wave Detail: E 2 ft at 11 seconds and E 1 foot at
4 seconds.
.TONIGHT...S winds around 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 11 seconds and SE 2 ft at 4 seconds.
.TUE...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 13 seconds and E 2 ft at 10 seconds. A chance of showers in
the afternoon.
.TUE NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 12 seconds and E 2 ft at 10 seconds. Showers likely. Vsby
1 to 3 NM.
.WED...N winds 5 to 10 kt, becoming NE 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: NE 3 ft
at 4 seconds and E 3 ft at 12 seconds. Showers likely, mainly in
the morning with vsby 1 to 3 NM.
.WED NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and SE
3 ft at 11 seconds. A chance of showers.
.THU AND THU NIGHT...E winds around 10 kt, becoming S. Seas 2 to
3 ft. A chance of showers.
.FRI AND FRI 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.

$$

ANZ231-230300-
Cape Cod Bay-
1005 AM EDT Mon Sep 22 2025

.THIS AFTERNOON...E winds around 5 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 11 seconds and E 1 foot at 4 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 11 seconds and SW 1 foot at 2 seconds.
.TUE...SW winds around 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 12 seconds and SW 1 foot at 3 seconds.
.TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 12 seconds and SW 1 foot at 3 seconds. A chance of
showers in the evening. Showers likely after midnight with vsby
1 to 3 NM.
.WED...NW winds 5 to 10 kt, becoming NE in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 12 seconds and W 1 foot at
2 seconds. Showers likely. Vsby 1 to 3 NM in the morning.
.WED NIGHT...NE winds around 10 kt. Seas around 2 ft. Wave
Detail: N 2 ft at 4 seconds and SE 2 ft at 10 seconds. A chance
of showers.
.THU THROUGH FRI NIGHT...SW winds 10 to 15 kt with gusts up to
20 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.

$$

ANZ254-230300-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1005 AM EDT Mon Sep 22 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM TUESDAY MORNING THROUGH
WEDNESDAY MORNING...

.THIS AFTERNOON...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: SE 4 ft at 11 seconds and E 2 ft at 5 seconds.
.TONIGHT...S winds around 5 kt, becoming SW after midnight. Seas
3 to 5 ft. Wave Detail: SE 5 ft at 11 seconds.
.TUE...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: SE
5 ft at 12 seconds and SW 2 ft at 3 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 3 to 5 ft. Wave
Detail: SE 5 ft at 11 seconds and SW 2 ft at 4 seconds. A chance
of showers. Vsby 1 to 3 NM after midnight.
.WED...SW winds 5 to 10 kt, becoming N in the afternoon. Seas
3 to 5 ft. Wave Detail: SE 5 ft at 11 seconds and NE 1 foot at
2 seconds. Showers likely. Vsby 1 to 3 NM in the morning.
.WED NIGHT...NE winds around 10 kt. Seas 3 to 4 ft. Wave Detail:
SE 4 ft at 11 seconds and NE 2 ft at 3 seconds. A chance of
showers.
.THU THROUGH FRI NIGHT...SW winds 10 to 15 kt with gusts up to
20 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.

$$

ANZ255-230300-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1005 AM EDT Mon Sep 22 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM TUESDAY MORNING THROUGH
WEDNESDAY MORNING...

.THIS AFTERNOON...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: SE 4 ft at 11 seconds and E 1 foot at 3 seconds.
.TONIGHT...S winds around 5 kt, becoming SW after midnight. Seas
3 to 5 ft. Wave Detail: SE 5 ft at 11 seconds.
.TUE...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: SE
5 ft at 11 seconds and SW 2 ft at 3 seconds.
.TUE NIGHT...SW winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail:
SE 5 ft at 12 seconds and W 2 ft at 4 seconds. A chance of
showers after midnight.
.WED...SW winds around 10 kt, becoming N in the afternoon. Seas
3 to 4 ft. Wave Detail: SE 4 ft at 11 seconds and SW 2 ft at
4 seconds. A chance of showers.
.WED NIGHT...NE winds around 10 kt. Seas 3 to 4 ft. Wave Detail:
SE 4 ft at 11 seconds and NE 2 ft at 3 seconds. A chance of
showers.
.THU THROUGH FRI...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. A chance of showers.
.FRI NIGHT...SW winds 10 to 15 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.

$$

ANZ256-230300-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1005 AM EDT Mon Sep 22 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM TUESDAY AFTERNOON THROUGH
LATE TUESDAY NIGHT...

.THIS AFTERNOON...E winds around 5 kt. Seas 3 to 4 ft. Wave
Detail: SE 4 ft at 11 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: SE
5 ft at 11 seconds.
.TUE...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 4 to 5 ft. Wave Detail: SE 5 ft at 12 seconds and SW 2 ft at
4 seconds.
.TUE NIGHT...SW winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail:
SE 5 ft at 12 seconds and SW 2 ft at 4 seconds. A chance of
showers.
.WED...W winds 5 to 10 kt, becoming SE in the afternoon. Seas
around 4 ft. Wave Detail: SE 4 ft at 11 seconds and SW 2 ft at
4 seconds. A chance of showers.
.WED NIGHT...E winds around 10 kt. Seas around 4 ft. Wave Detail:
SE 4 ft at 11 seconds and NE 2 ft at 3 seconds. A chance of
showers.
.THU THROUGH FRI...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 4 ft. A chance of showers.
.FRI NIGHT...SW winds 10 to 15 kt. Seas around 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.

$$

ANZ232-230300-
Nantucket Sound-
1005 AM EDT Mon Sep 22 2025

.THIS AFTERNOON...E winds around 5 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 11 seconds and SE 1 foot at 4 seconds.
.TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
2 to 3 ft. Wave Detail: SE 2 ft at 11 seconds and SW 1 foot at
3 seconds.
.TUE...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at
13 seconds.
.TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE
2 ft at 12 seconds. A chance of showers.
.WED...W winds around 10 kt, becoming N in the afternoon. Seas
2 to 3 ft. Wave Detail: SE 2 ft at 12 seconds and SW 1 foot at
3 seconds. Showers likely, mainly in the morning.
.WED NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail:
NE 2 ft at 3 seconds and SE 2 ft at 10 seconds. A chance of
showers.
.THU THROUGH FRI NIGHT...SW winds 10 to 15 kt with gusts up to
20 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.

$$

ANZ233-230300-
Vineyard Sound-
1005 AM EDT Mon Sep 22 2025

.THIS AFTERNOON...NE winds around 5 kt, becoming SE. Seas around
2 ft. Wave Detail: SE 2 ft at 11 seconds and E 1 foot at
3 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
2 ft at 11 seconds and SW 1 foot at 2 seconds.
.TUE...SW 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 SE 2 ft at
12 seconds.
.TUE NIGHT...SW 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 2 ft at 12 seconds. A chance
of showers.
.WED...W winds 5 to 10 kt, becoming NE in the afternoon. Seas
2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at
11 seconds. A chance of showers.
.WED NIGHT...NE winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
SE 2 ft at 11 seconds and NE 1 foot at 3 seconds. A chance of
showers.
.THU THROUGH FRI NIGHT...SW winds 10 to 15 kt with gusts up to
20 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.

$$

ANZ234-230300-
Buzzards Bay-
1005 AM EDT Mon Sep 22 2025

.THIS AFTERNOON...NE winds around 5 kt, becoming S around 5 kt.
Seas around 2 ft. Wave Detail: SE 2 ft at 11 seconds and E 1 foot
at 3 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 11 seconds and SE 1 foot at 4 seconds.
.TUE...SW 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 SE 2 ft at
13 seconds.
.TUE NIGHT...SW 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 2 ft at 12 seconds. A chance
of showers.
.WED...W winds 5 to 10 kt, becoming NE 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 11 seconds
and SW 1 foot at 4 seconds. A chance of showers.
.WED NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 10 seconds and SE 2 ft at 11 seconds. A chance of
showers.
.THU THROUGH FRI NIGHT...SW winds 10 to 15 kt with gusts up to
20 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.

$$

ANZ235-230300-
Rhode Island Sound-
1005 AM EDT Mon Sep 22 2025

.THIS AFTERNOON...NE winds around 5 kt, becoming SE around 5 kt.
Seas 2 to 3 ft. Wave Detail: SE 3 ft at 11 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: SE
4 ft at 11 seconds and SW 1 foot at 2 seconds.
.TUE...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 3 to 4 ft. Wave Detail: SE 4 ft at 12 seconds and SW 3 ft at
4 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 3 to 4 ft. Wave
Detail: SE 4 ft at 12 seconds and SW 3 ft at 4 seconds. A chance
of showers.
.WED...W winds 5 to 10 kt, becoming NE in the afternoon. Seas
2 to 4 ft. Wave Detail: SE 4 ft at 11 seconds and SW 2 ft at
4 seconds. A chance of showers.
.WED NIGHT...E winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
SE 3 ft at 10 seconds and SE 3 ft at 11 seconds. A chance of
showers.
.THU THROUGH FRI NIGHT...SW winds 10 to 15 kt with gusts up to
20 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.

$$

ANZ237-230300-
Block Island Sound-
1005 AM EDT Mon Sep 22 2025

.THIS AFTERNOON...NE winds around 5 kt, becoming SE. Seas 2 to
3 ft. Wave Detail: SE 3 ft at 11 seconds and SE 1 foot at
5 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 11 seconds.
.TUE...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 3 to 4 ft. Wave Detail: SE 4 ft at 11 seconds and SW 2 ft at
3 seconds.
.TUE NIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt
after midnight. Seas 3 to 4 ft. Wave Detail: SE 4 ft at
12 seconds and SW 2 ft at 4 seconds. A chance of showers.
.WED...W winds 5 to 10 kt, becoming SE in the afternoon. Seas
3 to 4 ft. Wave Detail: SE 4 ft at 11 seconds and SW 1 foot at
4 seconds. A chance of showers.
.WED NIGHT...E winds around 10 kt. Seas around 3 ft. Wave Detail:
SE 3 ft at 11 seconds and E 2 ft at 4 seconds. A chance of
showers.
.THU...SE winds around 10 kt. Seas around 3 ft. A chance of
showers.
.THU NIGHT...S winds around 10 kt. Seas 2 to 3 ft. Showers
likely.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of showers.
.FRI NIGHT...SW winds 10 to 15 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.

$$

ANZ230-230300-
Boston Harbor-
1005 AM EDT Mon Sep 22 2025

.THIS AFTERNOON...E winds around 5 kt, becoming SE. Waves 1 foot
or less.
.TONIGHT...S winds 5 to 10 kt. Waves 1 foot or less.
.TUE...SW winds 5 to 10 kt. Waves 1 foot or less. A chance of
showers in the afternoon.
.TUE NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. Showers
likely. Vsby 1 to 3 NM after midnight.
.WED...N winds 5 to 10 kt, becoming NE 10 to 15 kt with gusts up
to 20 kt in the afternoon. Waves 1 foot or less, then around 2 ft
in the afternoon. Showers likely, mainly in the morning with vsby
1 to 3 NM.
.WED NIGHT...NE winds 10 to 15 kt, diminishing to 5 to 10 kt
after midnight. Waves around 2 ft in the evening, then 1 foot or
less. A chance of showers.
.THU AND THU NIGHT...E winds 5 to 10 kt, becoming S. Waves around
2 ft, then 1 foot or less. A chance of showers.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt,
becoming SW 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.

$$

ANZ236-230300-
Narragansett Bay-
1005 AM EDT Mon Sep 22 2025

.THIS AFTERNOON...NE winds around 5 kt, becoming S. Waves around
2 ft.
.TONIGHT...SW winds 5 to 10 kt. Waves 2 to 3 ft.
.TUE...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Waves 2 to 3 ft.
.TUE NIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt
after midnight. Waves 2 to 3 ft. A chance of showers in the
evening. Showers likely after midnight.
.WED...NW winds 5 to 10 kt, becoming NE in the afternoon. Waves
2 to 3 ft. A chance of showers.
.WED NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.
.THU AND THU NIGHT...SE winds 5 to 10 kt, becoming S. Waves
around 2 ft. A chance of showers.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft. A chance of showers.
.FRI 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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