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National Weather Service Marine Forecast FZUS51 KBOX

FZUS51 KBOX 240148
CWFBOX

Coastal Waters Forecast
National Weather Service Boston/Norton MA
948 PM EDT Wed May 23 2018

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

ANZ200-241415-
948 PM EDT Wed May 23 2018

Synopsis for Massachusetts and Rhode Island coastal waters

High pressure will build over the waters on Thursday and will settle
south of the waters on Friday. A cold front will slowly settle
across the waters from the north on Saturday. This front will become
mainly stationary over the waters for Sunday and Monday.     

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.



ANZ250-241415-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
948 PM EDT Wed May 23 2018

OVERNIGHT
N winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance
of showers and tstms late this evening.

THU
NE winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft.

THU NIGHT
S winds 10 to 15 kt, becoming SW 15 to 20 kt after
midnight. Gusts up to 25 kt. Seas 2 to 4 ft.

FRI
SW winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft.

FRI NIGHT
SW winds 15 to 20 kt with gusts up to 30 kt. Seas
2 to 4 ft.

SAT
SW winds 10 to 15 kt with gusts up to 25 kt, becoming S
5 to 10 kt in the afternoon. Seas 2 to 4 ft.

SAT NIGHT
E winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. A chance of showers. Vsby 1 to 3 NM.

SUN
E winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft. A chance of showers. Vsby 1 to 3 NM.

SUN NIGHT
E winds 10 to 15 kt with gusts up to 20 kt. Seas
4 to 6 ft. Areas of fog. A chance of showers. Vsby 1 to 3 NM.

MON
E winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers.
Vsby 1 to 3 NM.

MON NIGHT
W winds 5 to 10 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.



ANZ251-241415-
Massachusetts Bay and Ipswich Bay-
948 PM EDT Wed May 23 2018

OVERNIGHT
N winds 5 to 10 kt. Seas around 2 ft.

THU
NE winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft.

THU NIGHT
SW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 4 ft.

FRI
SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Gusts up to 20 kt. Seas 2 to 3 ft.

FRI NIGHT
SW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft.

SAT
SW winds 5 to 10 kt, becoming S in the afternoon. Seas
around 2 ft.

SAT NIGHT
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers. Vsby 1 to 3 NM.

SUN
E winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers.
Vsby 1 to 3 NM.

SUN NIGHT
E winds 5 to 10 kt. Seas 3 to 5 ft. A chance of
showers. Vsby 1 to 3 NM.

MON
NE winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers.
Vsby 1 to 3 NM.

MON NIGHT
NW winds around 5 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.



ANZ231-241415-
Cape Cod Bay-
948 PM EDT Wed May 23 2018

OVERNIGHT
W winds 5 to 10 kt, becoming N. Seas around 2 ft.

THU
NE winds 5 to 10 kt, becoming E in the afternoon. Seas
around 2 ft.

THU NIGHT
SW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft.

FRI
SW winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft.

FRI NIGHT
SW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Gusts up to 25 kt. Seas 2 to 4 ft.

SAT
SW winds 10 to 15 kt with gusts up to 20 kt, diminishing
to 5 to 10 kt in the afternoon. Seas around 2 ft.

SAT NIGHT
S winds 5 to 10 kt, becoming E after midnight. Seas
2 to 3 ft. A chance of showers. Vsby 1 to 3 NM.

SUN
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Vsby 1 to 3 NM.

SUN NIGHT
E winds 5 to 10 kt. Seas 2 to 4 ft. A chance of
showers. Vsby 1 to 3 NM.

MON
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Vsby 1 to 3 NM.

MON NIGHT
W winds around 5 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.



ANZ254-241415-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
948 PM EDT Wed May 23 2018

OVERNIGHT
W winds 5 to 10 kt, becoming N. Seas 2 to 4 ft.

THU
NE winds 5 to 10 kt, becoming E in the afternoon. Seas
2 to 4 ft.

THU NIGHT
SW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 4 ft.

FRI
SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft.

FRI NIGHT
SW winds 15 to 20 kt with gusts up to 30 kt. Seas
4 to 6 ft.

SAT
SW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 3 to 5 ft.

SAT NIGHT
S winds 10 to 15 kt with gusts up to 20 kt, becoming
SE 5 to 10 kt after midnight. Seas 2 to 4 ft. Areas of fog. A
chance of showers. Vsby 1 to 3 NM.

SUN
E winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft. A chance of showers. Vsby 1 to 3 NM.

SUN NIGHT
E winds 10 to 15 kt with gusts up to 20 kt. Seas
4 to 6 ft. Areas of fog. A chance of showers. Vsby 1 to 3 NM.

MON
SE winds 5 to 10 kt. Seas 3 to 5 ft. Areas of fog. A
chance of showers. Vsby 1 to 3 NM.

MON NIGHT
W winds around 5 kt. Seas 2 to 4 ft. Patchy fog. A
chance of showers. Vsby 1 to 3 NM. 

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.



ANZ255-241415-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
948 PM EDT Wed May 23 2018

OVERNIGHT
W winds 5 to 10 kt, becoming NW. Seas 3 to 4 ft.

THU
N winds 5 to 10 kt, becoming E in the afternoon. Seas 2 to
4 ft.

THU NIGHT
S winds 5 to 10 kt, becoming SW 10 to 15 kt after
midnight. Seas 3 to 4 ft.

FRI
SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to
6 ft.

FRI NIGHT
SW winds 15 to 20 kt with gusts up to 30 kt. Seas
4 to 6 ft.

SAT
SW winds around 15 kt with gusts up to 25 kt. Seas 4 to
6 ft.

SAT 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. Areas
of fog. A chance of showers. Vsby 1 to 3 NM.

SUN
E winds 5 to 10 kt. Seas 2 to 4 ft. Areas of fog. A chance
of showers. Vsby 1 to 3 NM.

SUN NIGHT
E winds 5 to 10 kt. Seas 2 to 4 ft. Areas of fog. A
chance of showers. Vsby 1 to 3 NM.

MON
E winds 5 to 10 kt. Seas 2 to 4 ft. Areas of fog. A chance
of showers. Vsby 1 to 3 NM.

MON NIGHT
SW winds around 5 kt. Seas 2 to 4 ft. Patchy fog. A
chance of showers. Vsby 1 to 3 NM. 

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.



ANZ256-241415-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
948 PM EDT Wed May 23 2018

OVERNIGHT
W winds 5 to 10 kt, becoming NW. Seas 3 to 4 ft.

THU
N winds 5 to 10 kt, becoming SE in the afternoon. Seas
around 3 ft.

THU NIGHT
SW winds 10 to 15 kt. Seas 3 to 4 ft.

FRI
SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft.

FRI NIGHT
SW winds 15 to 20 kt with gusts up to 30 kt. Seas
4 to 6 ft.

SAT
SW winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to
6 ft.

SAT 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. A
chance of showers. Vsby 1 to 3 NM.

SUN
E winds 5 to 10 kt. Seas around 3 ft. A chance of showers.
Vsby 1 to 3 NM.

SUN NIGHT
NE winds 5 to 10 kt. Seas around 3 ft. A chance of
showers. Vsby 1 to 3 NM.

MON
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Vsby 1 to 3 NM.

MON NIGHT
S winds around 5 kt. Seas 2 to 3 ft. Patchy fog. A
chance of showers. Vsby 1 to 3 NM. 

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.



ANZ232-241415-
Nantucket Sound-
948 PM EDT Wed May 23 2018

OVERNIGHT
W winds 5 to 10 kt, becoming N. Seas 1 to 2 ft.

THU
N winds 5 to 10 kt, becoming SE in the afternoon. Seas
1 to 2 ft.

THU NIGHT
SW winds 10 to 15 kt. Gusts up to 25 kt after
midnight. Seas 2 to 3 ft.

FRI
SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
4 ft.

FRI NIGHT
SW winds 15 to 20 kt with gusts up to 30 kt. Seas
2 to 4 ft.

SAT
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft.

SAT NIGHT
SW winds 10 to 15 kt with gusts up to 20 kt,
becoming S 5 to 10 kt after midnight. Seas 2 to 3 ft. Areas of
fog. A chance of showers. Vsby 1 to 3 NM.

SUN
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Vsby 1 to 3 NM.

SUN NIGHT
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers. Vsby 1 to 3 NM.

MON
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Vsby 1 to 3 NM.

MON NIGHT
W winds around 5 kt. Seas around 2 ft. A chance of
showers. Vsby 1 to 3 NM. 

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.



ANZ233-241415-
Vineyard Sound-
948 PM EDT Wed May 23 2018

OVERNIGHT
W winds 5 to 10 kt, becoming N. Seas 1 to 2 ft.

THU
N winds 5 to 10 kt, becoming SE in the afternoon. Seas
1 to 2 ft.

THU NIGHT
SW winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas around 2 ft.

FRI
SW winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Gusts up to 30 kt. Seas 2 to 4 ft.

FRI NIGHT
SW winds 15 to 20 kt with gusts up to 30 kt. Seas
2 to 4 ft.

SAT
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft.

SAT NIGHT
SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft. Areas of
fog. A chance of showers. Vsby 1 to 3 NM.

SUN
NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers. Vsby 1 to 3 NM.

SUN NIGHT
NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers. Vsby 1 to 3 NM.

MON
E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Vsby 1 to 3 NM.

MON NIGHT
S winds around 5 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.



ANZ234-241415-
Buzzards Bay-
948 PM EDT Wed May 23 2018

OVERNIGHT
W winds 5 to 10 kt, becoming N. Seas around 2 ft.

THU
N winds 5 to 10 kt, becoming SE in the afternoon. Seas
around 2 ft.

THU NIGHT
SW winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 3 ft.

FRI
SW winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft.

FRI NIGHT
SW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Gusts up to 25 kt. Seas 2 to 4 ft.

SAT
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft.

SAT NIGHT
W winds 5 to 10 kt. Seas around 2 ft. A chance of
showers. Vsby 1 to 3 NM.

SUN
NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers. Vsby 1 to 3 NM.

SUN NIGHT
NE winds 5 to 10 kt. Seas 1 foot or less. A chance
of showers. Vsby 1 to 3 NM.

MON
E winds around 5 kt. Seas 1 foot or less. A chance of
showers. Vsby 1 to 3 NM.

MON NIGHT
S winds around 5 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.



ANZ235-241415-
Rhode Island Sound-
948 PM EDT Wed May 23 2018

OVERNIGHT
W winds 5 to 10 kt, becoming NW. Seas 2 to 3 ft.

THU
N winds 5 to 10 kt, becoming SE in the afternoon. Seas
2 to 3 ft.

THU NIGHT
S winds 5 to 10 kt, becoming SW 10 to 15 kt with
gusts up to 20 kt after midnight. Seas 2 to 4 ft.

FRI
SW winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Gusts up to 30 kt. Seas 3 to 5 ft.

FRI NIGHT
SW winds 15 to 20 kt with gusts up to 30 kt. Seas
3 to 5 ft.

SAT
SW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft.

SAT NIGHT
SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Seas 2 to 4 ft. A chance of
showers. Vsby 1 to 3 NM.

SUN
NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Vsby 1 to 3 NM.

SUN NIGHT
NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers. Vsby 1 to 3 NM.

MON
E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Vsby 1 to 3 NM.

MON NIGHT
S winds around 5 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.



ANZ237-241415-
Block Island Sound-
948 PM EDT Wed May 23 2018

OVERNIGHT
NW winds 5 to 10 kt. Seas 2 to 3 ft.

THU
N winds 5 to 10 kt, becoming SE in the afternoon. Seas
2 to 3 ft.

THU NIGHT
SW winds 5 to 10 kt. Seas 2 to 4 ft.

FRI
SW winds 10 to 15 kt with gusts up to 20 kt, increasing to
15 to 20 kt with gusts up to 30 kt in the afternoon. Seas 2 to
4 ft.

FRI NIGHT
SW winds 15 to 20 kt with gusts up to 30 kt. Seas
3 to 5 ft.

SAT
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft.

SAT NIGHT
SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft. A
chance of showers. Vsby 1 to 3 NM.

SUN
E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Vsby 1 to 3 NM.

SUN NIGHT
NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers. Vsby 1 to 3 NM.

MON
E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Vsby 1 to 3 NM.

MON NIGHT
S winds around 5 kt. Seas around 2 ft. A chance of
showers. Vsby 1 to 3 NM. 

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.



ANZ230-241415-
Boston Harbor-
948 PM EDT Wed May 23 2018

OVERNIGHT
N winds around 5 kt. Waves 1 foot or less.

THU
NE winds 5 to 10 kt, becoming SE in the afternoon. Waves
1 foot or less.

THU NIGHT
SW winds 5 to 10 kt with gusts up to 25 kt. Waves
around 2 ft.

FRI
SW winds 5 to 10 kt, becoming W 10 to 15 kt in the
afternoon. Gusts up to 20 kt. Waves around 2 ft.

FRI NIGHT
SW winds around 10 kt. Waves 1 foot or less.

SAT
SW winds 5 to 10 kt. Waves 1 foot or less. A chance of
showers.

SAT NIGHT
NE winds 5 to 10 kt. Waves 1 foot or less. A chance
of showers.

SUN
NE winds 5 to 10 kt. Waves 1 foot or less. A chance of
showers.

SUN NIGHT
NE winds around 5 kt. Waves 1 foot or less. A chance
of showers. Vsby 1 to 3 NM.

MON
NE winds around 5 kt. Waves 1 foot or less. A chance of
showers.

MON NIGHT
W winds around 5 kt. Waves 1 foot or less. 

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.



ANZ236-241415-
Narragansett Bay-
948 PM EDT Wed May 23 2018

OVERNIGHT
W winds around 5 kt, becoming NW. Waves 2 to 3 ft.

THU
N winds 5 to 10 kt, becoming SE in the afternoon. Waves
around 2 ft.

THU NIGHT
SW winds 5 to 10 kt. Gusts up to 20 kt after
midnight. Waves 2 to 3 ft.

FRI
SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Waves 2 to 3 ft.

FRI NIGHT
SW winds 10 to 15 kt with gusts up to 25 kt. Waves
2 to 3 ft.

SAT
SW winds 5 to 10 kt. Waves 2 to 3 ft.

SAT NIGHT
SW winds 5 to 10 kt, becoming NW after midnight.
Waves around 2 ft. A chance of showers. Vsby 1 to 3 NM.

SUN
NE winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.

SUN NIGHT
NE winds 5 to 10 kt. Waves around 2 ft. A chance of
showers. Vsby 1 to 3 NM.

MON
E winds around 5 kt. Waves around 2 ft. A chance of
showers.

MON NIGHT
S 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.



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