924
FZUS51 KBOX 191405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1004 AM EDT Sat Apr 19 2025

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

ANZ200-200300-
1004 AM EDT Sat Apr 19 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pres moves offshore today. A cold front will cross the waters
late tonight. Another high pres builds over the region for Mon,
with another front passing over the waters Tue. Another high
pres should arrive for Wed.

$$

ANZ250-200300-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SUNDAY EVENING...

.THIS AFTERNOON...SW winds around 20 kt with gusts up to 30 kt.
Seas 4 to 6 ft. Wave Detail: SW 4 ft at 4 seconds and SE 2 ft at
8 seconds.
.TONIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: SW 4 ft at 5 seconds and SE 3 ft at 8 seconds.
.SUN...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: W 4 ft at 4 seconds and SE 2 ft at 8 seconds.
.SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft. Wave Detail: W 3 ft at 5 seconds and N 1 foot at
4 seconds.
.MON...N winds 5 to 10 kt, becoming SE in the afternoon. Seas
2 to 3 ft. Wave Detail: N 2 ft at 5 seconds and S 1 foot at
4 seconds.
.MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and N 1 foot at
4 seconds. A chance of rain after midnight.
.TUE...S winds around 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. A chance of rain.
.TUE NIGHT AND WED...W winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 4 ft.
.WED NIGHT...W winds around 10 kt. Seas 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.

$$

ANZ251-200300-
Massachusetts Bay and Ipswich Bay-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 7 PM EDT THIS EVENING...

.THIS AFTERNOON...SW winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 1 foot at
8 seconds.
.TONIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at
8 seconds.
.SUN...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: W 3 ft at 4 seconds and N 1 foot at 4 seconds.
.SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave
Detail: NW 2 ft at 4 seconds and N 1 foot at 4 seconds.
.MON...N winds 5 to 10 kt, becoming SE in the afternoon. Seas
1 foot or less, then around 2 ft in the afternoon. Wave Detail:
NW 1 foot at 3 seconds and N 1 foot at 5 seconds, becoming NW
1 foot at 2 seconds and S 1 foot at 3 seconds.
.MON NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
S 2 ft at 3 seconds and NE 1 foot at 4 seconds. A chance of rain
after midnight.
.TUE...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of rain.
.TUE NIGHT THROUGH WED NIGHT...W winds 10 to 15 kt. Seas 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.

$$

ANZ231-200300-
Cape Cod Bay-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM EDT THIS EVENING...

.THIS AFTERNOON...SW winds around 20 kt with gusts up to 30 kt.
Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and S 2 ft at
8 seconds.
.TONIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
4 ft. Wave Detail: SW 3 ft at 4 seconds and S 2 ft at 8 seconds.
.SUN...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 2 ft at 7 seconds.
.SUN NIGHT...NW 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: NW 2 ft at 5 seconds and S 2 ft at 8 seconds.
.MON...N winds 5 to 10 kt, becoming SE in the afternoon. Seas
around 2 ft in the morning, then 1 foot or less. Wave Detail: NW
1 foot at 4 seconds and N 1 foot at 5 seconds.
.MON NIGHT...S winds 5 to 10 kt, increasing to 10 to 15 kt after
midnight. Seas 1 foot or less, then around 2 ft after midnight.
Wave Detail: S 1 foot at 2 seconds and N 1 foot at 5 seconds. A
chance of rain after midnight.
.TUE...S winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. A chance of rain.
.TUE NIGHT THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Seas 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.

$$

ANZ254-200300-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SUNDAY EVENING...

.THIS AFTERNOON...SW winds 20 to 25 kt with gusts up to 30 kt.
Seas 5 to 8 ft. Wave Detail: S 7 ft at 8 seconds and W 2 ft at
4 seconds.
.TONIGHT...SW winds 20 to 25 kt, becoming W 15 to 20 kt after
midnight. Gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: SW 7 ft
at 7 seconds and W 2 ft at 4 seconds. Patchy fog after midnight.
.SUN...NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: S 5 ft
at 8 seconds and NW 3 ft at 4 seconds.
.SUN NIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 3 to 5 ft. Wave Detail: NW 3 ft at 5 seconds and S
3 ft at 8 seconds.
.MON AND MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: N 2 ft at 5 seconds and N 2 ft at
6 seconds.
.TUE...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: S 4 ft at 6 seconds and N 1 foot at 5 seconds.
A chance of rain.
.TUE NIGHT THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up
to 20 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.

$$

ANZ255-200300-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SUNDAY EVENING...

.THIS AFTERNOON...SW winds around 25 kt with gusts up to 30 kt.
Seas 6 to 9 ft. Wave Detail: SW 9 ft at 8 seconds and W 1 foot at
4 seconds.
.TONIGHT...SW winds 20 to 25 kt, becoming W 15 to 20 kt after
midnight. Gusts up to 30 kt. Seas 6 to 9 ft. Wave Detail: SW 9 ft
at 8 seconds and SW 2 ft at 5 seconds. Patchy fog after midnight
with vsby 1 to 3 NM.
.SUN...NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 5 to 7 ft. Wave Detail: SW 6 ft at 8 seconds and
NW 1 foot at 4 seconds.
.SUN NIGHT...NW winds around 10 kt. Seas 3 to 5 ft. Wave Detail:
S 4 ft at 8 seconds and N 1 foot at 4 seconds.
.MON AND MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and S 2 ft at
7 seconds.
.TUE...S winds 15 to 20 kt. Seas 3 to 5 ft. Wave Detail: S 5 ft
at 7 seconds and NE 1 foot at 5 seconds. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 5 ft.
.WED AND WED NIGHT...W winds 5 to 10 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.

$$

ANZ256-200300-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SUNDAY EVENING...

.THIS AFTERNOON...SW winds 20 to 25 kt with gusts up to 30 kt.
Seas 6 to 8 ft. Wave Detail: S 8 ft at 8 seconds.
.TONIGHT...SW winds 20 to 25 kt, becoming W 15 to 20 kt after
midnight. Gusts up to 30 kt. Seas 6 to 8 ft. Wave Detail: SW 8 ft
at 8 seconds and SW 2 ft at 5 seconds.
.SUN...NW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas 4 to 6 ft. Wave Detail: S 6 ft at 8 seconds and NW 2 ft at
4 seconds.
.SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: S
4 ft at 8 seconds and N 1 foot at 3 seconds.
.MON AND MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: S 3 ft at 6 seconds and N 1 foot at
3 seconds.
.TUE...SW winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft
at 6 seconds and SE 1 foot at 9 seconds. A chance of rain.
.TUE NIGHT THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up
to 20 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.

$$

ANZ232-200300-
Nantucket Sound-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.THIS AFTERNOON...SW winds 20 to 25 kt with gusts up to 30 kt.
Seas 4 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and S 3 ft at
8 seconds.
.TONIGHT...SW winds 20 to 25 kt, becoming W 15 to 20 kt after
midnight. Gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 4 ft
at 5 seconds and S 3 ft at 8 seconds. Patchy fog after midnight.
.SUN...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NW 2 ft at 4 seconds and S 2 ft at 8 seconds.
.SUN NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
S 2 ft at 8 seconds and NW 1 foot at 3 seconds.
.MON AND MON NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: S 2 ft at 3 seconds and N 1 foot at 3 seconds.
.TUE...S winds around 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 4 seconds and N 1 foot at 4 seconds.
A chance of rain.
.TUE NIGHT THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up
to 20 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.

$$

ANZ233-200300-
Vineyard Sound-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SUNDAY MORNING...

.THIS AFTERNOON...SW winds 20 to 25 kt with gusts up to 30 kt.
Seas 4 to 6 ft. Wave Detail: SW 6 ft at 8 seconds and W 1 foot at
4 seconds.
.TONIGHT...SW winds 20 to 25 kt, becoming W 15 to 20 kt after
midnight. Gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: SW 6 ft
at 8 seconds and W 1 foot at 4 seconds.
.SUN...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: S 4 ft at 8 seconds and NW 2 ft at 3 seconds.
.SUN NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SW 2 ft at 8 seconds and NW 1 foot at 3 seconds.
.MON...NE winds around 5 kt, becoming S in the afternoon. Seas
1 foot or less. Wave Detail: NW 1 foot at 3 seconds and N 1 foot
at 4 seconds.
.MON NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 1 foot or less, then around 2 ft after midnight.
Wave Detail: S 1 foot at 4 seconds and SE 1 foot at 9 seconds,
becoming S 2 ft at 4 seconds and SE 1 foot at 9 seconds. A chance
of rain after midnight.
.TUE...S winds around 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of rain.
.TUE NIGHT THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up
to 20 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.

$$

ANZ234-200300-
Buzzards Bay-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.THIS AFTERNOON...SW winds 20 to 25 kt with gusts up to 30 kt.
Seas 3 to 5 ft. Wave Detail: S 5 ft at 7 seconds and W 1 foot at
4 seconds.
.TONIGHT...SW winds 20 to 25 kt, becoming W 15 to 20 kt after
midnight. Gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft
at 7 seconds and W 2 ft at 4 seconds.
.SUN...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 8 seconds and NW 2 ft at 3 seconds.
.SUN NIGHT...NW winds 5 to 10 kt. Seas around 2 ft in the
evening, then 1 foot or less. Wave Detail: SW 2 ft at 8 seconds
and NW 1 foot at 3 seconds, becoming N 1 foot at 4 seconds and SW
1 foot at 7 seconds.
.MON...NE winds around 5 kt, becoming S in the afternoon. Seas
1 foot or less. Wave Detail: NW 1 foot at 3 seconds and N 1 foot
at 4 seconds.
.MON NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 1 foot or less, then around 2 ft after midnight.
Wave Detail: SW 1 foot at 3 seconds and NE 1 foot at 5 seconds,
becoming S 2 ft at 3 seconds and NE 1 foot at 5 seconds. A chance
of rain after midnight.
.TUE...SW winds around 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of rain.
.TUE NIGHT THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up
to 20 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.

$$

ANZ235-200300-
Rhode Island Sound-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SUNDAY EVENING...

.THIS AFTERNOON...SW winds 20 to 25 kt with gusts up to 30 kt.
Seas 5 to 7 ft. Wave Detail: S 7 ft at 8 seconds and W 1 foot at
3 seconds.
.TONIGHT...SW winds 20 to 25 kt, becoming W 15 to 20 kt after
midnight. Gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: SW 7 ft
at 7 seconds and W 1 foot at 4 seconds.
.SUN...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft. Wave Detail: SW 5 ft at 7 seconds and NW 2 ft at 3 seconds.
.SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
3 ft at 8 seconds and NW 1 foot at 3 seconds.
.MON...NE winds 5 to 10 kt, becoming S in the afternoon. Seas
around 2 ft in the morning, then 1 foot or less. Wave Detail: S
2 ft at 7 seconds and N 1 foot at 3 seconds, becoming S 1 foot at
7 seconds.
.MON NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 1 foot or less, then 2 to 3 ft after midnight.
Wave Detail: S 1 foot at 5 seconds and SE 1 foot at 9 seconds,
becoming S 3 ft at 4 seconds and SE 1 foot at 9 seconds. A chance
of rain after midnight.
.TUE...SW winds around 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. A chance of rain.
.TUE NIGHT AND WED...W winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 4 ft.
.WED NIGHT...W winds 5 to 10 kt. Seas 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.

$$

ANZ237-200300-
Block Island Sound-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SUNDAY EVENING...

.THIS AFTERNOON...SW winds around 20 kt with gusts up to 30 kt.
Seas 4 to 6 ft. Wave Detail: S 5 ft at 8 seconds and W 2 ft at
4 seconds.
.TONIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after
midnight. Gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: S 6 ft
at 8 seconds and SW 2 ft at 5 seconds.
.SUN...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft. Wave Detail: SW 5 ft at 7 seconds and W 2 ft at 3 seconds.
.SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
3 ft at 8 seconds and NW 1 foot at 3 seconds.
.MON...NE winds around 5 kt, becoming S in the afternoon. Seas
around 2 ft in the morning, then 1 foot or less. Wave Detail: S
2 ft at 7 seconds, becoming S 1 foot at 7 seconds.
.MON NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 3 ft. Wave Detail: S 2 ft at 5 seconds and SE
1 foot at 9 seconds. A chance of rain after midnight.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of rain.
.TUE NIGHT THROUGH WED NIGHT...W winds 10 to 15 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.

$$

ANZ230-200300-
Boston Harbor-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 7 PM EDT THIS EVENING...

.THIS AFTERNOON...SW winds 15 to 20 kt with gusts up to 25 kt.
Waves around 2 ft. A slight chance of showers.
.TONIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Waves
around 2 ft. A chance of showers in the evening.
.SUN...NW winds 15 to 20 kt with gusts up to 25 kt. Waves around
2 ft.
.SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Waves around 2 ft in
the evening, then 1 foot or less.
.MON...N winds around 5 kt, becoming SE in the afternoon. Waves
1 foot or less.
.MON NIGHT...S winds around 10 kt. Waves around 2 ft. A chance of
rain after midnight.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft. A chance of rain.
.TUE NIGHT THROUGH WED NIGHT...W winds 10 to 15 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.

$$

ANZ236-200300-
Narragansett Bay-
1004 AM EDT Sat Apr 19 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.THIS AFTERNOON...SW winds 15 to 20 kt with gusts up to 30 kt.
Waves 3 to 5 ft.
.TONIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after
midnight. Gusts up to 25 kt. Waves 3 to 5 ft.
.SUN...NW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft.
.SUN NIGHT...NW winds 5 to 10 kt. Waves 2 to 3 ft.
.MON...NE winds around 5 kt, becoming S in the afternoon. Waves
around 2 ft in the morning, then 1 foot or less.
.MON NIGHT...S winds around 10 kt. Waves 1 foot or less, then
around 2 ft after midnight. A chance of rain after midnight.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft. A chance of rain.
.TUE NIGHT THROUGH WED NIGHT...W winds 5 to 10 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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