National Weather Service Weather Forecast Office

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
FZUS51 KBOX 252005
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 PM EDT Thu Apr 25 2024

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

ANZ200-260900-
405 PM EDT Thu Apr 25 2024

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pres builds into New England tonight through Friday. The high
eventually shifts offshore this weekend. This will allow a warm
front to lift in and bring showers late Saturday into early
Sunday. The trailing cold front may slide through on Monday.

$$

ANZ250-260900-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
405 PM EDT Thu Apr 25 2024

.TONIGHT...S winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and
NE 2 ft at 5 seconds. Patchy frost.
.FRI...NE winds 5 to 10 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 2 ft at
9 seconds.
.FRI NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
around 2 ft. Wave Detail: S 2 ft at 3 seconds and E 2 ft at
8 seconds.
.SAT...W winds 5 to 10 kt, becoming S in the afternoon. Seas
around 2 ft. Wave Detail: E 1 ft at 2 seconds and SW 1 ft at
4 seconds.
.SAT NIGHT AND SUN...S winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: S 2 ft at 4 seconds and E 2 ft at 9 seconds. A chance of
showers through the day.
.SUN NIGHT...SW winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
E 3 ft at 10 seconds and SW 2 ft at 4 seconds.
.MON AND MON NIGHT...NE winds around 10 kt, becoming SE. Seas
2 to 3 ft.
.TUE AND TUE NIGHT...SE 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.

$$

ANZ251-260900-
Massachusetts Bay and Ipswich Bay-
405 PM EDT Thu Apr 25 2024

.TONIGHT...S winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Seas 2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and NE
2 ft at 6 seconds. Patchy frost after midnight.
.FRI...NE winds 5 to 10 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: E 2 ft at 9 seconds and W 1 ft at
3 seconds.
.FRI NIGHT...S winds around 10 kt, becoming SW after midnight.
Seas around 2 ft. Wave Detail: S 1 ft at 3 seconds and NE 1 ft at
4 seconds.
.SAT...W winds around 5 kt, becoming SE 10 to 15 kt in the
afternoon. Seas around 2 ft in the morning, then 1 foot or less.
Wave Detail: E 1 ft at 3 seconds and SW 1 ft at 3 seconds,
becoming W 1 ft at 2 seconds and SE 1 ft at 3 seconds.
.SAT NIGHT AND SUN...S winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: S 2 ft at 3 seconds and E 2 ft at 9 seconds. A chance of
showers through the day.
.SUN NIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt
after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at
3 seconds and E 2 ft at 10 seconds.
.MON AND MON NIGHT...NE winds 5 to 10 kt, becoming SE. Seas
around 2 ft.
.TUE AND TUE NIGHT...SE winds 5 to 10 kt, becoming S 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.

$$

ANZ231-260900-
Cape Cod Bay-
405 PM EDT Thu Apr 25 2024

.TONIGHT...S winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: N 2 ft at 6 seconds and E 2 ft at
9 seconds. Patchy frost.
.FRI...N winds 5 to 10 kt, becoming NE in the afternoon. Seas
around 2 ft in the morning, then 1 foot or less. Wave Detail: N
1 ft at 5 seconds and S 1 ft at 6 seconds, becoming N 1 ft at
3 seconds and S 1 ft at 6 seconds. Patchy frost in the morning.
.FRI NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
1 foot or less. Wave Detail: N 1 ft at 4 seconds and S 1 ft at
5 seconds.
.SAT...W winds 5 to 10 kt, becoming SE in the afternoon. Seas
1 foot or less. Wave Detail: W 1 ft at 2 seconds and NE 1 ft at
4 seconds.
.SAT NIGHT THROUGH SUN NIGHT...SW winds 5 to 10 kt with gusts up
to 20 kt. Seas 1 foot or less. Wave Detail: SW 1 ft at 3 seconds
and E 1 ft at 10 seconds.
.MON AND MON NIGHT...N winds around 10 kt, becoming E. Seas
around 2 ft. Wave Detail: E 2 ft at 10 seconds and N 1 ft at
2 seconds.
.TUE AND TUE NIGHT...S winds 5 to 10 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.

$$

ANZ254-260900-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
405 PM EDT Thu Apr 25 2024

.TONIGHT...SE winds 5 to 10 kt, becoming NW after midnight. Seas
2 to 4 ft. Wave Detail: N 3 ft at 6 seconds and E 2 ft at
8 seconds. Patchy frost.
.FRI...NE winds around 5 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft
at 5 seconds and E 2 ft at 9 seconds.
.FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 8 seconds and N 1 ft at 4 seconds.
.SAT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft
at 9 seconds and W 1 ft at 3 seconds.
.SAT NIGHT THROUGH SUN NIGHT...SW winds 10 to 15 kt. Seas 2 to
3 ft. Wave Detail: E 3 ft at 10 seconds and SW 2 ft at 3 seconds.
.MON THROUGH TUE...SE winds around 10 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: E 3 ft at 10 seconds and SW 2 ft at
4 seconds.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 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.

$$

ANZ255-260900-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
405 PM EDT Thu Apr 25 2024

.TONIGHT...SE winds 5 to 10 kt, becoming N after midnight. Seas
2 to 4 ft. Wave Detail: NE 2 ft at 5 seconds and SW 2 ft at
7 seconds. Patchy frost.
.FRI...NE winds around 5 kt, becoming S in the afternoon. Seas
around 2 ft. Wave Detail: E 2 ft at 7 seconds and S 1 ft at
6 seconds. Patchy frost in the morning.
.FRI NIGHT...SW winds around 5 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and W 1 ft at 2 seconds.
.SAT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft
at 8 seconds and W 1 ft at 2 seconds.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and W
2 ft at 3 seconds.
.MON THROUGH TUE...SE winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 10 seconds and NE 2 ft at 3 seconds.
.TUE NIGHT...S 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.

$$

ANZ256-260900-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
405 PM EDT Thu Apr 25 2024

.TONIGHT...SE winds 5 to 10 kt, becoming N after midnight. Seas
2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and S 2 ft at
7 seconds. Patchy frost.
.FRI...NE winds around 5 kt, becoming S in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 8 seconds.
.FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and SW 1 ft at 2 seconds.
.SAT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 8 seconds and W 1 ft at 2 seconds.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and S
2 ft at 7 seconds.
.MON THROUGH TUE...SE winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 10 seconds and E 2 ft at 3 seconds.
.TUE NIGHT...S 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.

$$

ANZ232-260900-
Nantucket Sound-
405 PM EDT Thu Apr 25 2024

.TONIGHT...SE winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: E 2 ft at 9 seconds and NW 1 ft at
4 seconds. Patchy frost.
.FRI...N winds around 5 kt, becoming SE in the afternoon. Seas
around 2 ft in the morning, then 1 foot or less. Wave Detail: N
1 ft at 4 seconds and S 1 ft at 6 seconds. Patchy frost in the
morning.
.FRI NIGHT...SW winds around 5 kt. Seas 1 foot or less. Wave
Detail: SW 1 ft at 2 seconds and NE 1 ft at 4 seconds.
.SAT...W winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: W
1 ft at 2 seconds and N 1 ft at 4 seconds.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Seas 1 foot or less. Wave Detail: SW 1 ft at 4 seconds
and E 1 ft at 8 seconds.
.MON THROUGH TUE...SE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 4 seconds and E 2 ft at 10 seconds.
.TUE NIGHT...S 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.

$$

ANZ233-260900-
Vineyard Sound-
405 PM EDT Thu Apr 25 2024

.TONIGHT...S winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft this evening, then 1 foot or less. Wave Detail: SW
2 ft at 4 seconds and NE 1 ft at 4 seconds, becoming SW 1 ft at
3 seconds and NE 1 ft at 4 seconds. Patchy frost.
.FRI...NW winds around 5 kt, becoming SW in the afternoon. Seas
1 foot or less. Wave Detail: SW 1 ft at 2 seconds and NE 1 ft at
5 seconds. Patchy frost in the morning.
.FRI NIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: SW 1 ft at 3 seconds and S 1 ft at 7 seconds.
.SAT...W winds 5 to 10 kt, becoming SW 10 to 15 kt in the
afternoon. Seas 1 foot or less. Wave Detail: SW 1 ft at 3 seconds
and S 1 ft at 7 seconds.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and
SE 1 ft at 10 seconds.
.MON THROUGH TUE...SE winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: NE 1 ft at 2 seconds and SW 1 ft at 5 seconds.
.TUE NIGHT...S winds 10 to 15 kt. Seas 1 foot or less. 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.

$$

ANZ234-260900-
Buzzards Bay-
405 PM EDT Thu Apr 25 2024

.TONIGHT...S winds 5 to 10 kt, becoming W after midnight. Seas
1 foot or less. Wave Detail: SW 1 ft at 4 seconds and NE 1 ft at
4 seconds. Patchy frost.
.FRI...N winds around 5 kt, becoming SW in the afternoon. Seas
1 foot or less. Wave Detail: NE 1 ft at 4 seconds and S 1 ft at
6 seconds. Patchy frost in the morning.
.FRI NIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: SW 1 ft at 3 seconds and NE 1 ft at 4 seconds.
.SAT...W winds 5 to 10 kt, becoming SW 10 to 15 kt in the
afternoon. Seas 1 foot or less. Wave Detail: SW 1 ft at 3 seconds
and SE 1 ft at 7 seconds.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and
SE 1 ft at 9 seconds.
.MON AND MON NIGHT...N winds 5 to 10 kt, becoming E. Seas 1 foot
or less. Wave Detail: NE 1 ft at 2 seconds and SW 1 ft at
4 seconds.
.TUE AND TUE NIGHT...SE winds 5 to 10 kt, becoming S. Seas 1 foot
or less. 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.

$$

ANZ235-260900-
Rhode Island Sound-
405 PM EDT Thu Apr 25 2024

.TONIGHT...S winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 7 seconds and NE 1 ft at
3 seconds. Patchy frost after midnight.
.FRI...NE winds around 5 kt, becoming S in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 9 seconds and SW 1 ft at
2 seconds. Patchy frost in the morning.
.FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft in the
evening, then 1 foot or less. Wave Detail: S 2 ft at 8 seconds
and SW 1 ft at 3 seconds, becoming SW 1 ft at 3 seconds and SE
1 ft at 8 seconds.
.SAT...W winds 5 to 10 kt, becoming SW 10 to 15 kt in the
afternoon. Seas 1 foot or less. Wave Detail: SW 1 ft at 3 seconds
and SE 1 ft at 8 seconds.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and
SE 2 ft at 11 seconds.
.MON AND MON NIGHT...N winds 5 to 10 kt, becoming E. Seas around
2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at
10 seconds.
.TUE AND TUE NIGHT...SE winds around 10 kt, becoming S. 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.

$$

ANZ237-260900-
Block Island Sound-
405 PM EDT Thu Apr 25 2024

.TONIGHT...S winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: S 2 ft at 6 seconds and E 2 ft at
9 seconds.
.FRI...NE winds around 5 kt, becoming S in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 ft at
2 seconds.
.FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft in the
evening, then 1 foot or less. Wave Detail: SE 2 ft at 7 seconds
and SW 1 ft at 3 seconds, becoming SW 1 ft at 3 seconds and S
1 ft at 7 seconds.
.SAT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: W
1 ft at 2 seconds and S 1 ft at 7 seconds.
.SAT NIGHT AND SUN...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and SE 2 ft at
9 seconds.
.SUN NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SW 2 ft at 4 seconds and SE 2 ft at 8 seconds.
.MON AND MON NIGHT...N winds 5 to 10 kt, becoming SE. Seas around
2 ft.
.TUE AND TUE NIGHT...SE winds 5 to 10 kt, becoming S. 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.

$$

ANZ230-260900-
Boston Harbor-
405 PM EDT Thu Apr 25 2024

.TONIGHT...S winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Waves 1 foot or less.
.FRI...NE winds 5 to 10 kt, becoming SE in the afternoon. Waves
1 foot or less.
.FRI NIGHT...S winds 5 to 10 kt, becoming SW after midnight.
Waves 1 foot or less.
.SAT...SW winds around 5 kt, becoming SE 10 to 15 kt in the
afternoon. Waves 1 foot or less, then around 2 ft in the
afternoon.
.SAT NIGHT AND SUN...SW winds 10 to 15 kt. Waves around 2 ft. A
chance of showers through the day.
.SUN NIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Waves around 2 ft in the evening, then 1 foot or less.
.MON...NE winds 5 to 10 kt. Waves 1 foot or less.
.MON NIGHT THROUGH TUE NIGHT...S winds 5 to 10 kt with gusts up
to 20 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.

$$

ANZ236-260900-
Narragansett Bay-
405 PM EDT Thu Apr 25 2024

.TONIGHT...S winds 10 to 15 kt, becoming W around 5 kt after
midnight. Waves around 2 ft this evening, then 1 foot or less.
Patchy frost after midnight.
.FRI...NE winds 5 to 10 kt, becoming S in the afternoon. Waves
1 foot or less. Patchy frost in the morning.
.FRI NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less.
.SAT...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Waves 1 foot or less.
.SAT NIGHT AND SUN...SW winds 10 to 15 kt with gusts up to 20 kt.
Waves around 2 ft. A chance of showers through the day.
.SUN NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Waves around 2 ft.
.MON AND MON NIGHT...NE winds 5 to 10 kt, becoming SE. Waves
around 2 ft.
.TUE AND TUE NIGHT...SE winds 5 to 10 kt with gusts up to 20 kt,
becoming S. 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.

$$

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