Coastal Waters Forecast
Issued by NWS Boston, MA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FZUS51 KBOX 270739
CWFBOX

Coastal Waters Forecast
National Weather Service Boston/Norton MA
339 AM EDT Fri Apr 27 2018

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

ANZ200-272030-
339 AM EDT Fri Apr 27 2018

.Synopsis for Massachusetts and Rhode Island coastal waters...
Low pressure will approach from the southwest today resulting in
showers and isolated thunderstorms across the waters this
afternoon into the evening. The low will lift north across New
England tonight. Scattered showers will push across the waters
late Saturday night ahead of a slow moving cold front, which
should cross the waters by midday Sunday. High pressure will
slowly build in early next week.

For information on possible hazardous weather beyond the 24-36
hour forecast period, please visit www.weather.gov/boston and
follow the Current Hazards link above the map on the left.

$$

ANZ250-272030-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
339 AM EDT Fri Apr 27 2018

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

.TODAY...SW winds around 5 kt, becoming SE with gusts up to 20 kt
this afternoon. Seas 4 to 6 ft. Patchy fog this afternoon.
Showers likely this afternoon with vsby 1 to 3 NM.
.TONIGHT...S winds 5 to 10 kt with gusts up to 20 kt. Seas 3 to
5 ft. Areas of fog. Showers. Vsby 1 NM or less.
.SAT...S winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 3 to 5 ft. Patchy fog early. Vsby 1 NM or less.
.SAT NIGHT...S winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft.
.SUN...S winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 4 ft. A chance of showers.
.SUN NIGHT...SW winds 10 to 15 kt. Seas 3 to 5 ft.
.MON...SW winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to
4 ft.
.MON NIGHT...W winds 5 to 10 kt. Seas 2 to 4 ft.
.TUE...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.TUE NIGHT...SW winds around 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.

$$

ANZ251-272030-
Massachusetts Bay and Ipswich Bay-
339 AM EDT Fri Apr 27 2018

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM EDT THIS MORNING...

.TODAY...SW winds around 5 kt, becoming SE with gusts up to 20 kt
this afternoon. Seas 3 to 5 ft early, subsiding to 2 to 4 ft.
Patchy fog this afternoon. Showers this afternoon with vsby 1 to 3
NM.
.TONIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas
2 to 3 ft. Areas of fog early. Showers. Vsby 1 NM or less.
.SAT...S winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Areas of fog. Vsby 1 NM or less.
.SAT NIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft.
.SUN...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.SUN NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft.
.MON...W winds 5 to 10 kt. Seas 2 to 3 ft.
.MON NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft.
.TUE...W winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.TUE NIGHT...W 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.

$$

ANZ231-272030-
Cape Cod Bay-
339 AM EDT Fri Apr 27 2018

.TODAY...SE winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with
isolated tstms this afternoon with vsby 1 to 3 NM.
.TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Areas
of fog. Showers. Vsby 1 NM or less.
.SAT...S winds 5 to 10 kt. Seas around 2 ft. Areas of fog early.
Vsby 1 NM or less.
.SAT NIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft.
.SUN...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 1 to 2 ft. A chance of showers. Vsby 1 to 3 NM.
.SUN NIGHT...W winds 5 to 10 kt. Seas around 2 ft.
.MON...SW winds 5 to 10 kt with gusts up to 20 kt. Seas 1 to
2 ft.
.MON NIGHT...W winds 5 to 10 kt. Seas 1 to 2 ft.
.TUE...W winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.

Winds and seas higher in and near tstms.

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.

$$

ANZ254-272030-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
339 AM EDT Fri Apr 27 2018

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY AFTERNOON...

.TODAY...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts
up to 25 kt this afternoon. Seas 4 to 7 ft. Patchy fog this
afternoon. A chance of showers with isolated tstms this afternoon
with vsby 1 to 3 NM.
.TONIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to
6 ft. Areas of fog. Showers. Vsby 1 NM or less.
.SAT...SW winds 5 to 10 kt. Seas 3 to 5 ft. Areas of fog early.
Vsby 1 NM or less.
.SAT NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 3 to 5 ft.
.SUN...S winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 3 to 4 ft.
.SUN NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 5 ft.
.MON...SW winds 5 to 10 kt with gusts up to 20 kt. Seas 3 to
5 ft.
.MON NIGHT...W winds 5 to 10 kt. Seas 2 to 4 ft.
.TUE...W winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 4 ft.
.TUE NIGHT...SW winds 10 to 15 kt. Seas 2 to 4 ft. A chance of
showers.

Winds and seas higher in and near tstms.

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.

$$

ANZ255-272030-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
339 AM EDT Fri Apr 27 2018

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY AFTERNOON...

.TODAY...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts
up to 25 kt this afternoon. Seas 4 to 7 ft. Patchy fog this
afternoon. Showers likely with isolated tstms this afternoon with
vsby 1 to 3 NM.
.TONIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to
6 ft. Areas of fog early. Showers. Vsby 1 NM or less.
.SAT...SW winds 5 to 10 kt. Seas 3 to 5 ft. Patchy fog. Vsby 1 NM
or less.
.SAT NIGHT...SW winds 5 to 10 kt. Seas 3 to 4 ft.
.SUN...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 3 to 4 ft.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
4 to 5 ft.
.MON...W winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft.
.MON NIGHT...W winds 10 to 15 kt. Seas 3 to 4 ft.
.TUE...W winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
4 ft.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ256-272030-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
339 AM EDT Fri Apr 27 2018

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY AFTERNOON...

.TODAY...SE winds 5 to 10 kt, increasing to 10 to 15 kt with
gusts up to 25 kt this afternoon. Seas 4 to 7 ft. A slight chance
of rain this morning, then showers with isolated tstms this
afternoon. Patchy fog this afternoon. Vsby 1 to 3 NM, decreasing
to 1 NM or less this afternoon.
.TONIGHT...S winds 10 to 15 kt, becoming SW 5 to 10 kt after
midnight. Gusts up to 25 kt. Seas 4 to 6 ft. Areas of fog.
Showers. Vsby 1 NM or less.
.SAT...SW winds 5 to 10 kt. Seas 3 to 5 ft. Areas of fog early.
Vsby 1 to 3 NM.
.SAT NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas around 4 ft.
.SUN...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 4 to 5 ft. A chance of
showers.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
4 to 5 ft.
.MON...W winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft.
.MON NIGHT...W winds 10 to 15 kt. Seas 3 to 5 ft.
.TUE...W winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
4 ft.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 4 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ232-272030-
Nantucket Sound-
339 AM EDT Fri Apr 27 2018

.TODAY...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts
up to 20 kt this afternoon. Seas 2 to 4 ft. Patchy fog this
afternoon. Showers likely with isolated tstms this afternoon with
vsby 1 to 3 NM.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening.
Seas 2 to 4 ft. Areas of fog. Showers. Vsby 1 NM or less.
.SAT...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Areas of fog early. Vsby 1 NM or less.
.SAT NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 1 to 2 ft.
.SUN...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas around 2 ft. A chance of
showers. Vsby 1 to 3 NM.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft.
.MON...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft.
.MON NIGHT...W winds around 10 kt. Seas 1 to 2 ft.
.TUE...W winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft.
.TUE NIGHT...W winds 10 to 15 kt. Seas around 2 ft. A chance of
showers.

Winds and seas higher in and near tstms.

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.

$$

ANZ233-272030-
Vineyard Sound-
339 AM EDT Fri Apr 27 2018

.TODAY...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts
up to 20 kt this afternoon. Seas 2 to 3 ft. Patchy fog this
afternoon. Showers with isolated tstms this afternoon with vsby
1 to 3 NM.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening.
Seas 2 to 3 ft. Areas of fog. Showers. Vsby 1 NM or less.
.SAT...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Areas of fog early. Vsby 1 to 3 NM.
.SAT NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft.
.SUN...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. A chance of
showers. Vsby 1 to 3 NM.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft.
.MON...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft.
.MON NIGHT...W winds around 10 kt. Seas 1 to 2 ft.
.TUE...W winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft.
.TUE NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ234-272030-
Buzzards Bay-
339 AM EDT Fri Apr 27 2018

.TODAY...SE winds 5 to 10 kt. Gusts up to 20 kt this afternoon.
Seas 2 to 3 ft. Patchy fog this afternoon. Showers with isolated
tstms this afternoon with vsby 1 to 3 NM.
.TONIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the evening.
Seas 2 to 3 ft. Areas of fog. Showers. Vsby 1 NM or less.
.SAT...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Areas of fog early. Vsby 1 to 3 NM.
.SAT NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft.
.SUN...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas 2 to 4 ft. A chance of
showers. Vsby 1 to 3 NM.
.SUN NIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Gusts up to 20 kt. Seas 2 to 4 ft.
.MON...W winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 3 ft.
.MON NIGHT...W winds 5 to 10 kt. Seas around 2 ft.
.TUE...W winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 3 ft.
.TUE NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ235-272030-
Rhode Island Sound-
339 AM EDT Fri Apr 27 2018

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

.TODAY...SE winds 5 to 10 kt, increasing to 10 to 15 kt with
gusts up to 20 kt this afternoon. Seas 4 to 6 ft. Patchy fog this
afternoon. Showers with isolated tstms this afternoon with vsby
1 to 3 NM.
.TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming
SW 5 to 10 kt after midnight. Seas 3 to 5 ft. Areas of fog.
Showers. Vsby 1 NM or less.
.SAT...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 4 ft. Areas of fog early. Vsby 1 to 3 NM.
.SAT NIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming
SW 5 to 10 kt after midnight. Seas 2 to 4 ft.
.SUN...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. A chance of
showers.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 5 ft.
.MON...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft.
.MON NIGHT...W winds 10 to 15 kt. Seas 2 to 4 ft.
.TUE...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft.
.TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ237-272030-
Block Island Sound-
339 AM EDT Fri Apr 27 2018

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

.TODAY...SE winds 5 to 10 kt. Gusts up to 20 kt this afternoon.
Seas 3 to 5 ft. A slight chance of rain this morning, then
showers with isolated tstms this afternoon. Patchy fog this
afternoon with vsby 1 NM or less.
.TONIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the evening.
Seas 3 to 5 ft. Areas of fog. Showers likely. Vsby 1 NM or less.
.SAT...SW winds 5 to 10 kt. Seas 2 to 4 ft. Areas of fog early.
Vsby 1 to 3 NM.
.SAT NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 2 to 4 ft.
.SUN...W winds 5 to 10 kt, becoming SW 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft.
.MON...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft.
.MON NIGHT...W winds around 10 kt. Seas 2 to 4 ft.
.TUE...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft.
.TUE NIGHT...W winds 10 to 15 kt. Seas 2 to 4 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ230-272030-
Boston Harbor-
339 AM EDT Fri Apr 27 2018

.TODAY...SW winds around 5 kt, becoming SE this afternoon. Waves
around 2 ft. Showers likely this afternoon with vsby 1 to 3 NM.
.TONIGHT...E winds 5 to 10 kt, becoming S after midnight. Waves
1 foot or less. Areas of fog. Showers. Vsby 1 NM or less.
.SAT...SW winds around 5 kt, becoming S in the afternoon. Waves
1 foot or less.
.SAT NIGHT...S winds 5 to 10 kt. Waves 1 foot or less.
.SUN...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Waves around 2 ft. A chance of showers.
.SUN NIGHT...W winds 5 to 10 kt. Waves around 2 ft.
.MON...W winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.
.MON NIGHT...W winds around 5 kt. Waves 1 foot or less. A chance
of showers.
.TUE...W winds around 5 kt. Waves 1 foot or less. A chance of
showers.
.TUE NIGHT...W winds around 5 kt. Waves 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.

$$

ANZ236-272030-
Narragansett Bay-
339 AM EDT Fri Apr 27 2018

.TODAY...SE winds around 5 kt, increasing to 5 to 10 kt this
afternoon. Waves 2 to 4 ft. Patchy fog this afternoon. Showers
with isolated tstms this afternoon with vsby 1 to 3 NM.
.TONIGHT...S winds 5 to 10 kt. Waves 2 to 3 ft. Areas of fog
early. Showers. Vsby 1 NM or less.
.SAT...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Waves 2 to 3 ft. Areas of fog. Vsby 1 to 3 NM.
.SAT NIGHT...SW winds 5 to 10 kt. Waves 2 to 3 ft.
.SUN...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. A chance of
showers.
.SUN NIGHT...W winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Waves 2 to 3 ft.
.MON...W winds 5 to 10 kt with gusts up to 20 kt. Waves 2 to
3 ft.
.MON NIGHT...W winds 5 to 10 kt. Waves around 2 ft.
.TUE...W winds 5 to 10 kt with gusts up to 20 kt. Waves around
2 ft.
.TUE NIGHT...W winds 5 to 10 kt. Waves around 2 ft.

Winds and waves higher in and near tstms.

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


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.