FZUS51 KBOX 180503
CWFBOX
Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
103 AM EDT Fri Apr 18 2025
Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM
ANZ200-181800-
103 AM EDT Fri Apr 18 2025
.Synopsis for Massachusetts and Rhode Island coastal waters...
High pressure moves offshore Friday. A cold front will cross the
waters late Saturday night. Another high pressure builds over the
region for Monday. Showers move across the region Monday night into
Tuesday.
$$
ANZ250-181800-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: W 1 foot at 3 seconds and SE 1 foot at 9 seconds.
.FRI...SW winds 5 to 10 kt, becoming S 15 to 20 kt with gusts up
to 25 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at
4 seconds and SE 1 foot at 8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas
3 to 5 ft. Wave Detail: S 4 ft at 4 seconds and SE 2 ft at
7 seconds.
.SAT...SW winds around 20 kt with gusts up to 30 kt. Seas 4 to
6 ft. Wave Detail: S 4 ft at 6 seconds.
.SAT NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas
3 to 5 ft. Wave Detail: SW 3 ft at 5 seconds and SE 3 ft at
8 seconds.
.SUN AND SUN NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and SE 2 ft at
8 seconds.
.MON...NE winds 5 to 10 kt. Seas 2 to 3 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ251-181800-
Massachusetts Bay and Ipswich Bay-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...W winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: NW 1 foot at 3 seconds and E 1 foot at 7 seconds.
.FRI...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 1 foot or less, then around 2 ft
in the afternoon. Wave Detail: W 1 foot at 2 seconds and E 1 foot
at 6 seconds, becoming S 2 ft at 3 seconds and E 1 foot at
8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: S 3 ft at 3 seconds and SE 2 ft at
8 seconds.
.SAT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 7 seconds.
.SAT NIGHT THROUGH SUN NIGHT...NW winds 15 to 20 kt with gusts up
to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and
SE 2 ft at 8 seconds.
.MON...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NW
1 foot at 3 seconds and NE 1 foot at 6 seconds.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
around 2 ft. A chance of rain.
.TUE 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.
$$
ANZ231-181800-
Cape Cod Bay-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...W winds around 5 kt. Seas 1 foot or less. Wave
Detail: NW 1 foot at 4 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: NW 1 foot at 3 seconds,
becoming SW 2 ft at 3 seconds and E 1 foot at 6 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. Wave Detail: S 3 ft at 5 seconds.
.SAT...SW winds around 20 kt with gusts up to 30 kt. Seas 3 to
4 ft. Wave Detail: SW 3 ft at 4 seconds and S 2 ft at 8 seconds.
.SAT NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after
midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft
at 4 seconds and S 2 ft at 8 seconds.
.SUN AND SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: NW 2 ft at 4 seconds and S 2 ft at
8 seconds.
.MON...NE winds 5 to 10 kt. Seas around 2 ft.
.MON NIGHT AND TUE...S winds 5 to 10 kt, increasing to 10 to
15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt. Seas around 2 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ254-181800-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: S 2 ft at 8 seconds and NW 1 foot at 4 seconds.
.FRI...SW 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: SW
2 ft at 4 seconds and S 2 ft at 8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas
2 to 4 ft, building to 4 to 6 ft after midnight. Wave Detail: S
3 ft at 4 seconds and S 1 foot at 8 seconds, becoming S 5 ft at
5 seconds and SE 1 foot at 8 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to
8 ft. Wave Detail: SW 7 ft at 7 seconds.
.SAT NIGHT...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: S 6 ft
at 8 seconds and W 2 ft at 4 seconds.
.SUN...NW winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to
6 ft. Wave Detail: S 4 ft at 8 seconds and W 3 ft at 4 seconds.
.SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 5 ft.
.MON...N winds 5 to 10 kt. Seas 2 to 4 ft.
.MON NIGHT AND TUE...S winds 5 to 10 kt, increasing to 10 to
15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of rain.
.TUE NIGHT...W 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.
$$
ANZ255-181800-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. Wave
Detail: SW 2 ft at 5 seconds and S 2 ft at 8 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: SW
2 ft at 6 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Gusts up to 30 kt. Seas 2 to 4 ft, building to
4 to 6 ft after midnight. Wave Detail: SW 4 ft at 5 seconds and S
1 foot at 8 seconds, becoming SW 6 ft at 6 seconds and SE 1 foot
at 9 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
9 ft. Wave Detail: SW 9 ft at 8 seconds.
.SAT NIGHT AND SUN...W winds 20 to 25 kt with gusts up to 30 kt.
Seas 5 to 7 ft. Wave Detail: SW 7 ft at 8 seconds and SW 1 foot
at 4 seconds.
.SUN NIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 8 seconds and NW
1 foot at 4 seconds.
.MON...NE winds 5 to 10 kt. Seas 2 to 4 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 4 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 4 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ256-181800-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 5 seconds and S 1 foot at 8 seconds.
.FRI...SW 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: SW
2 ft at 5 seconds and S 1 foot at 8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Gusts up to 30 kt. Seas 2 to 4 ft, building to
4 to 6 ft after midnight. Wave Detail: SW 4 ft at 5 seconds and
SE 1 foot at 8 seconds, becoming S 6 ft at 7 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
8 ft. Wave Detail: SW 8 ft at 6 seconds.
.SAT NIGHT AND SUN...W winds 20 to 25 kt with gusts up to 30 kt.
Seas 5 to 7 ft. Wave Detail: SW 7 ft at 8 seconds and SW 1 foot
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: S 5 ft at 8 seconds and NW
1 foot at 3 seconds.
.MON...E winds 5 to 10 kt. Seas 2 to 3 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 4 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
around 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.
$$
ANZ232-181800-
Nantucket Sound-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds around 5 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 5 seconds and S 1 foot at 8 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: SW 1 foot at 5 seconds and S
1 foot at 8 seconds, becoming SW 2 ft at 3 seconds and S 1 foot
at 7 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Gusts up to 30 kt. Seas 2 to 4 ft. Wave Detail:
SW 3 ft at 4 seconds and SE 1 foot at 8 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: SW 4 ft at 4 seconds and S 3 ft at 7 seconds.
.SAT NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt,
becoming W 15 to 20 kt after midnight. Seas 3 to 5 ft. Wave
Detail: SW 4 ft at 4 seconds and SW 2 ft at 8 seconds.
.SUN AND SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: W 2 ft at 4 seconds and S 2 ft at
8 seconds.
.MON...NE winds 5 to 10 kt. Seas 1 foot or less.
.MON NIGHT AND TUE...S winds 5 to 10 kt, increasing to 10 to
15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ233-181800-
Vineyard Sound-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 6 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: S 1 foot at 6 seconds,
becoming SW 2 ft at 4 seconds and S 1 foot at 7 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 6 seconds
and S 2 ft at 9 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to
6 ft. Wave Detail: SW 6 ft at 7 seconds.
.SAT NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt,
becoming W 15 to 20 kt after midnight. Seas 4 to 6 ft. Wave
Detail: SW 6 ft at 8 seconds and SW 2 ft at 4 seconds.
.SUN AND SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: SW 4 ft at 8 seconds and W 1 foot at
4 seconds.
.MON...SE winds 5 to 10 kt. Seas 1 foot or less.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 3 ft. A chance of rain.
.TUE 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.
$$
ANZ234-181800-
Buzzards Bay-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds around 5 kt. Seas 1 foot or less.
Wave Detail: SW 1 foot at 6 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: S 1 foot at 6 seconds,
becoming SW 2 ft at 4 seconds and S 1 foot at 7 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 5 seconds
and SE 1 foot at 8 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: SW 5 ft at 7 seconds.
.SAT NIGHT...SW winds 20 to 25 kt, becoming W 15 to 20 kt after
midnight. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 8 seconds and
SW 3 ft at 4 seconds.
.SUN AND SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: SW 3 ft at 8 seconds and W 2 ft at
4 seconds.
.MON...S winds 5 to 10 kt. Seas 1 foot or less.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
around 2 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ235-181800-
Rhode Island Sound-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SW 2 ft at 5 seconds and S 1 foot at 8 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: SW 1 foot at 5 seconds and S
1 foot at 8 seconds, becoming SW 2 ft at 4 seconds and S 1 foot
at 7 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Seas 3 to 5 ft. Wave Detail: S 5 ft at 7 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to
7 ft. Wave Detail: SW 7 ft at 7 seconds.
.SAT NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt,
becoming W 15 to 20 kt after midnight. Seas 5 to 7 ft. Wave
Detail: S 7 ft at 8 seconds and SW 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: S 5 ft at 8 seconds and W 1 foot at 3 seconds.
.SUN NIGHT...NW winds 10 to 15 kt. Seas 2 to 4 ft.
.MON...SE winds around 10 kt. Seas around 2 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 4 ft. A chance of rain.
.TUE NIGHT...W 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.
$$
ANZ237-181800-
Block Island Sound-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: W 1 foot at 5 seconds and S 1 foot at 8 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: SW 1 foot at 5 seconds and S
1 foot at 8 seconds, becoming S 2 ft at 4 seconds and S 1 foot at
8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and S 3 ft at
8 seconds.
.SAT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to
6 ft. Wave Detail: SW 5 ft at 6 seconds.
.SAT NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after
midnight. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: S 5 ft
at 8 seconds and W 2 ft at 4 seconds.
.SUN...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft. Wave Detail: S 5 ft at 8 seconds and W 2 ft at 3 seconds.
.SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft.
.MON...SE winds 5 to 10 kt. Seas around 2 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 3 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ230-181800-
Boston Harbor-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...W winds 5 to 10 kt. Waves 1 foot or less.
.FRI...SW winds around 5 kt, becoming S 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.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Waves
around 2 ft.
.SAT...SW winds 15 to 20 kt with gusts up to 25 kt. Waves around
2 ft.
.SAT NIGHT THROUGH SUN NIGHT...NW winds 15 to 20 kt with gusts up
to 25 kt. Waves around 2 ft.
.MON...E winds 5 to 10 kt. Waves 1 foot or less.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Waves 1 foot or less,
then around 2 ft. A chance of rain.
.TUE 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.
$$
ANZ236-181800-
Narragansett Bay-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds around 5 kt. Waves around 2 ft.
.FRI...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up
to 20 kt in the afternoon. Waves 1 foot or less, then around 2 ft
in the afternoon.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Waves
2 to 4 ft.
.SAT...SW winds 15 to 20 kt with gusts up to 25 kt. Waves 3 to
5 ft.
.SAT NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after
midnight. Gusts up to 25 kt. Waves 3 to 5 ft.
.SUN AND SUN NIGHT...N winds 10 to 15 kt with gusts up to 20 kt.
Waves 2 to 3 ft.
.MON...S winds 5 to 10 kt. Waves around 2 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt.
Waves 2 to 3 ft. A chance of rain.
.TUE NIGHT...W winds 5 to 10 kt. Waves 2 to 3 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
For the latest updates...please visit our webpage at
www.weather.gov/boston
You can follow us on Facebook at
www.facebook.com/NWSBoston
You can follow us on Twitter at
@NWSBoston
CWFBOX
Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
103 AM EDT Fri Apr 18 2025
Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM
ANZ200-181800-
103 AM EDT Fri Apr 18 2025
.Synopsis for Massachusetts and Rhode Island coastal waters...
High pressure moves offshore Friday. A cold front will cross the
waters late Saturday night. Another high pressure builds over the
region for Monday. Showers move across the region Monday night into
Tuesday.
$$
ANZ250-181800-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: W 1 foot at 3 seconds and SE 1 foot at 9 seconds.
.FRI...SW winds 5 to 10 kt, becoming S 15 to 20 kt with gusts up
to 25 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at
4 seconds and SE 1 foot at 8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas
3 to 5 ft. Wave Detail: S 4 ft at 4 seconds and SE 2 ft at
7 seconds.
.SAT...SW winds around 20 kt with gusts up to 30 kt. Seas 4 to
6 ft. Wave Detail: S 4 ft at 6 seconds.
.SAT NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas
3 to 5 ft. Wave Detail: SW 3 ft at 5 seconds and SE 3 ft at
8 seconds.
.SUN AND SUN NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and SE 2 ft at
8 seconds.
.MON...NE winds 5 to 10 kt. Seas 2 to 3 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ251-181800-
Massachusetts Bay and Ipswich Bay-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...W winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: NW 1 foot at 3 seconds and E 1 foot at 7 seconds.
.FRI...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 1 foot or less, then around 2 ft
in the afternoon. Wave Detail: W 1 foot at 2 seconds and E 1 foot
at 6 seconds, becoming S 2 ft at 3 seconds and E 1 foot at
8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: S 3 ft at 3 seconds and SE 2 ft at
8 seconds.
.SAT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 7 seconds.
.SAT NIGHT THROUGH SUN NIGHT...NW winds 15 to 20 kt with gusts up
to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and
SE 2 ft at 8 seconds.
.MON...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NW
1 foot at 3 seconds and NE 1 foot at 6 seconds.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
around 2 ft. A chance of rain.
.TUE 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.
$$
ANZ231-181800-
Cape Cod Bay-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...W winds around 5 kt. Seas 1 foot or less. Wave
Detail: NW 1 foot at 4 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: NW 1 foot at 3 seconds,
becoming SW 2 ft at 3 seconds and E 1 foot at 6 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. Wave Detail: S 3 ft at 5 seconds.
.SAT...SW winds around 20 kt with gusts up to 30 kt. Seas 3 to
4 ft. Wave Detail: SW 3 ft at 4 seconds and S 2 ft at 8 seconds.
.SAT NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after
midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft
at 4 seconds and S 2 ft at 8 seconds.
.SUN AND SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: NW 2 ft at 4 seconds and S 2 ft at
8 seconds.
.MON...NE winds 5 to 10 kt. Seas around 2 ft.
.MON NIGHT AND TUE...S winds 5 to 10 kt, increasing to 10 to
15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt. Seas around 2 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ254-181800-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: S 2 ft at 8 seconds and NW 1 foot at 4 seconds.
.FRI...SW 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: SW
2 ft at 4 seconds and S 2 ft at 8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas
2 to 4 ft, building to 4 to 6 ft after midnight. Wave Detail: S
3 ft at 4 seconds and S 1 foot at 8 seconds, becoming S 5 ft at
5 seconds and SE 1 foot at 8 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to
8 ft. Wave Detail: SW 7 ft at 7 seconds.
.SAT NIGHT...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: S 6 ft
at 8 seconds and W 2 ft at 4 seconds.
.SUN...NW winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to
6 ft. Wave Detail: S 4 ft at 8 seconds and W 3 ft at 4 seconds.
.SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 5 ft.
.MON...N winds 5 to 10 kt. Seas 2 to 4 ft.
.MON NIGHT AND TUE...S winds 5 to 10 kt, increasing to 10 to
15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of rain.
.TUE NIGHT...W 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.
$$
ANZ255-181800-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. Wave
Detail: SW 2 ft at 5 seconds and S 2 ft at 8 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: SW
2 ft at 6 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Gusts up to 30 kt. Seas 2 to 4 ft, building to
4 to 6 ft after midnight. Wave Detail: SW 4 ft at 5 seconds and S
1 foot at 8 seconds, becoming SW 6 ft at 6 seconds and SE 1 foot
at 9 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
9 ft. Wave Detail: SW 9 ft at 8 seconds.
.SAT NIGHT AND SUN...W winds 20 to 25 kt with gusts up to 30 kt.
Seas 5 to 7 ft. Wave Detail: SW 7 ft at 8 seconds and SW 1 foot
at 4 seconds.
.SUN NIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 8 seconds and NW
1 foot at 4 seconds.
.MON...NE winds 5 to 10 kt. Seas 2 to 4 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 4 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 4 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ256-181800-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 5 seconds and S 1 foot at 8 seconds.
.FRI...SW 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: SW
2 ft at 5 seconds and S 1 foot at 8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Gusts up to 30 kt. Seas 2 to 4 ft, building to
4 to 6 ft after midnight. Wave Detail: SW 4 ft at 5 seconds and
SE 1 foot at 8 seconds, becoming S 6 ft at 7 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
8 ft. Wave Detail: SW 8 ft at 6 seconds.
.SAT NIGHT AND SUN...W winds 20 to 25 kt with gusts up to 30 kt.
Seas 5 to 7 ft. Wave Detail: SW 7 ft at 8 seconds and SW 1 foot
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: S 5 ft at 8 seconds and NW
1 foot at 3 seconds.
.MON...E winds 5 to 10 kt. Seas 2 to 3 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 4 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
around 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.
$$
ANZ232-181800-
Nantucket Sound-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds around 5 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 5 seconds and S 1 foot at 8 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: SW 1 foot at 5 seconds and S
1 foot at 8 seconds, becoming SW 2 ft at 3 seconds and S 1 foot
at 7 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Gusts up to 30 kt. Seas 2 to 4 ft. Wave Detail:
SW 3 ft at 4 seconds and SE 1 foot at 8 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: SW 4 ft at 4 seconds and S 3 ft at 7 seconds.
.SAT NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt,
becoming W 15 to 20 kt after midnight. Seas 3 to 5 ft. Wave
Detail: SW 4 ft at 4 seconds and SW 2 ft at 8 seconds.
.SUN AND SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: W 2 ft at 4 seconds and S 2 ft at
8 seconds.
.MON...NE winds 5 to 10 kt. Seas 1 foot or less.
.MON NIGHT AND TUE...S winds 5 to 10 kt, increasing to 10 to
15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ233-181800-
Vineyard Sound-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 6 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: S 1 foot at 6 seconds,
becoming SW 2 ft at 4 seconds and S 1 foot at 7 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 6 seconds
and S 2 ft at 9 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to
6 ft. Wave Detail: SW 6 ft at 7 seconds.
.SAT NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt,
becoming W 15 to 20 kt after midnight. Seas 4 to 6 ft. Wave
Detail: SW 6 ft at 8 seconds and SW 2 ft at 4 seconds.
.SUN AND SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: SW 4 ft at 8 seconds and W 1 foot at
4 seconds.
.MON...SE winds 5 to 10 kt. Seas 1 foot or less.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 3 ft. A chance of rain.
.TUE 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.
$$
ANZ234-181800-
Buzzards Bay-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds around 5 kt. Seas 1 foot or less.
Wave Detail: SW 1 foot at 6 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: S 1 foot at 6 seconds,
becoming SW 2 ft at 4 seconds and S 1 foot at 7 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 5 seconds
and SE 1 foot at 8 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: SW 5 ft at 7 seconds.
.SAT NIGHT...SW winds 20 to 25 kt, becoming W 15 to 20 kt after
midnight. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 8 seconds and
SW 3 ft at 4 seconds.
.SUN AND SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: SW 3 ft at 8 seconds and W 2 ft at
4 seconds.
.MON...S winds 5 to 10 kt. Seas 1 foot or less.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
around 2 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ235-181800-
Rhode Island Sound-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SW 2 ft at 5 seconds and S 1 foot at 8 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: SW 1 foot at 5 seconds and S
1 foot at 8 seconds, becoming SW 2 ft at 4 seconds and S 1 foot
at 7 seconds.
.FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. Seas 3 to 5 ft. Wave Detail: S 5 ft at 7 seconds.
.SAT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to
7 ft. Wave Detail: SW 7 ft at 7 seconds.
.SAT NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt,
becoming W 15 to 20 kt after midnight. Seas 5 to 7 ft. Wave
Detail: S 7 ft at 8 seconds and SW 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: S 5 ft at 8 seconds and W 1 foot at 3 seconds.
.SUN NIGHT...NW winds 10 to 15 kt. Seas 2 to 4 ft.
.MON...SE winds around 10 kt. Seas around 2 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 4 ft. A chance of rain.
.TUE NIGHT...W 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.
$$
ANZ237-181800-
Block Island Sound-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: W 1 foot at 5 seconds and S 1 foot at 8 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: SW 1 foot at 5 seconds and S
1 foot at 8 seconds, becoming S 2 ft at 4 seconds and S 1 foot at
8 seconds.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and S 3 ft at
8 seconds.
.SAT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to
6 ft. Wave Detail: SW 5 ft at 6 seconds.
.SAT NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after
midnight. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: S 5 ft
at 8 seconds and W 2 ft at 4 seconds.
.SUN...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft. Wave Detail: S 5 ft at 8 seconds and W 2 ft at 3 seconds.
.SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft.
.MON...SE winds 5 to 10 kt. Seas around 2 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 3 ft. A chance of rain.
.TUE NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ230-181800-
Boston Harbor-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...W winds 5 to 10 kt. Waves 1 foot or less.
.FRI...SW winds around 5 kt, becoming S 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.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Waves
around 2 ft.
.SAT...SW winds 15 to 20 kt with gusts up to 25 kt. Waves around
2 ft.
.SAT NIGHT THROUGH SUN NIGHT...NW winds 15 to 20 kt with gusts up
to 25 kt. Waves around 2 ft.
.MON...E winds 5 to 10 kt. Waves 1 foot or less.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Waves 1 foot or less,
then around 2 ft. A chance of rain.
.TUE 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.
$$
ANZ236-181800-
Narragansett Bay-
103 AM EDT Fri Apr 18 2025
.REST OF TONIGHT...NW winds around 5 kt. Waves around 2 ft.
.FRI...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up
to 20 kt in the afternoon. Waves 1 foot or less, then around 2 ft
in the afternoon.
.FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Waves
2 to 4 ft.
.SAT...SW winds 15 to 20 kt with gusts up to 25 kt. Waves 3 to
5 ft.
.SAT NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after
midnight. Gusts up to 25 kt. Waves 3 to 5 ft.
.SUN AND SUN NIGHT...N winds 10 to 15 kt with gusts up to 20 kt.
Waves 2 to 3 ft.
.MON...S winds 5 to 10 kt. Waves around 2 ft.
.MON NIGHT AND TUE...S winds 10 to 15 kt. Gusts up to 20 kt.
Waves 2 to 3 ft. A chance of rain.
.TUE NIGHT...W winds 5 to 10 kt. Waves 2 to 3 ft.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
For the latest updates...please visit our webpage at
www.weather.gov/boston
You can follow us on Facebook at
www.facebook.com/NWSBoston
You can follow us on Twitter at
@NWSBoston