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National Weather Service Marine Forecast FZUS51 KBOX

FZUS51 KBOX 231111
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
611 AM EST Sat Jan 23 2021

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

ANZ200-240000-
611 AM EST Sat Jan 23 2021

Synopsis for Massachusetts and Rhode Island coastal waters

Low pres over the Maritimes moves little through the weekend,
while high pres over the Great Lakes settles over the waters by Mon.
Weak low pres passes across the southern offshore waters on Tues.

For additional information on
possible hazardous weather for the week ahead, please visit
www.weather.gov/boston/ehwo.



ANZ250-240000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...

TODAY
NW winds 20 to 25 kt, increasing to 25 to 30 kt this
afternoon. Seas 5 to 8 ft. Light freezing spray.

TONIGHT
NW winds 30 to 35 kt. Gusts up to 45 kt after
midnight. Seas 7 to 10 ft. Light freezing spray.

SUN
NW winds 30 to 35 kt with gusts up to 45 kt. Seas 7 to
10 ft. Light freezing spray.

SUN NIGHT
NW winds 25 to 30 kt with gusts up to 35 kt,
diminishing to 15 to 20 kt with gusts up to 25 kt after midnight.
Seas 5 to 8 ft. Light freezing spray.

MON
NW winds 15 to 20 kt. Seas 3 to 5 ft.

MON NIGHT
N winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 4 ft.

TUE THROUGH WED NIGHT
N winds 10 to 15 kt with gusts up to
20 kt. Seas 3 to 5 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.



ANZ251-240000-
Massachusetts Bay and Ipswich Bay-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...
...FREEZING SPRAY ADVISORY IN EFFECT FROM THIS EVENING THROUGH
SUNDAY MORNING...

TODAY
NW winds 15 to 20 kt with gusts up to 25 kt, increasing
to 20 to 25 kt with gusts up to 35 kt this afternoon. Seas 3 to
5 ft. Light freezing spray. A chance of flurries this morning.

TONIGHT
NW winds 25 to 30 kt. Gusts up to 45 kt after
midnight. Seas 4 to 6 ft. Light freezing spray.

SUN
NW winds 25 to 30 kt, diminishing to 20 to 25 kt in the
afternoon. Gusts up to 45 kt. Seas 4 to 6 ft. Light freezing
spray.

SUN NIGHT
NW winds 20 to 25 kt with gusts up to 35 kt,
diminishing to 15 to 20 kt with gusts up to 25 kt after midnight.
Seas 3 to 5 ft. Light freezing spray.

MON
NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft.

MON NIGHT
N winds 10 to 15 kt. Seas around 2 ft.

TUE THROUGH WED NIGHT
N winds 10 to 15 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.



ANZ231-240000-
Cape Cod Bay-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...
...FREEZING SPRAY ADVISORY IN EFFECT FROM THIS EVENING THROUGH
SUNDAY MORNING...

TODAY
NW winds 20 to 25 kt, increasing to 25 to 30 kt with
gusts up to 35 kt this afternoon. Seas 3 to 5 ft. Light freezing
spray. A chance of snow showers this morning.

TONIGHT
NW winds 25 to 30 kt with gusts up to 40 kt. Seas 4 to
7 ft. Light freezing spray.

SUN
NW winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to
7 ft. Light freezing spray.

SUN NIGHT
NW winds 25 to 30 kt with gusts up to 35 kt,
diminishing to 15 to 20 kt with gusts up to 25 kt after midnight.
Seas 4 to 6 ft. Light freezing spray.

MON
NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 2 to 4 ft.

MON NIGHT
N winds 10 to 15 kt. Seas around 2 ft.

TUE THROUGH WED NIGHT
N 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.



ANZ254-240000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...

TODAY
NW winds 20 to 25 kt, increasing to 25 to 30 kt this
afternoon. Seas 5 to 8 ft. A chance of snow showers. Light
freezing spray this afternoon.

TONIGHT
NW winds around 30 kt with gusts up to 40 kt. Seas
7 to 10 ft. Light freezing spray. A chance of flurries.

SUN
NW winds around 30 kt with gusts up to 45 kt. Seas 8 to
11 ft. Light freezing spray.

SUN NIGHT
NW winds 25 to 30 kt with gusts up to 35 kt,
diminishing to 20 to 25 kt after midnight. Seas 7 to 10 ft. Light
freezing spray.

MON
NW winds 15 to 20 kt. Seas 4 to 7 ft. Light freezing
spray.

MON NIGHT
N winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 3 to 5 ft.

TUE THROUGH WED NIGHT
N winds 10 to 15 kt with gusts up to
20 kt. Seas 4 to 6 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.



ANZ255-240000-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...

TODAY
NW winds 20 to 25 kt, increasing to 25 to 30 kt this
afternoon. Seas 5 to 8 ft. A chance of snow showers this morning.
Light freezing spray this afternoon.

TONIGHT
NW winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to
9 ft. Light freezing spray.

SUN
NW winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to
9 ft. Light freezing spray.

SUN NIGHT
NW winds 25 to 30 kt with gusts up to 35 kt,
diminishing to 15 to 20 kt with gusts up to 25 kt after midnight.
Seas 5 to 8 ft. Light freezing spray.

MON
NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 4 to 6 ft.

MON NIGHT
N winds around 10 kt. Seas 2 to 4 ft.

TUE
NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of rain and snow. Vsby 1 to 3 NM.

TUE NIGHT THROUGH WED NIGHT
N winds 10 to 15 kt with gusts up
to 20 kt. Seas 3 to 5 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.



ANZ256-240000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...

TODAY
NW winds 20 to 25 kt, increasing to 25 to 30 kt this
afternoon. Seas 5 to 8 ft. A chance of flurries this morning.
Light freezing spray this afternoon.

TONIGHT
NW winds 25 to 30 kt with gusts up to 35 kt. Seas 6 to
8 ft. Light freezing spray.

SUN
NW winds 25 to 30 kt with gusts up to 35 kt. Seas 6 to
8 ft. Light freezing spray.

SUN NIGHT
NW winds 25 to 30 kt with gusts up to 35 kt,
diminishing to 15 to 20 kt with gusts up to 25 kt after midnight.
Seas 5 to 8 ft.

MON
NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 2 to 4 ft.

MON NIGHT
N winds around 10 kt, becoming NE with gusts up to
20 kt after midnight. Seas 2 to 3 ft.

TUE
NE winds 15 to 20 kt. Seas 2 to 4 ft. A chance of rain and
snow. Vsby 1 to 3 NM.

TUE NIGHT THROUGH WED NIGHT
N winds 15 to 20 kt. Seas 3 to
5 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.



ANZ232-240000-
Nantucket Sound-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...
...FREEZING SPRAY ADVISORY IN EFFECT FROM THIS EVENING THROUGH
SUNDAY MORNING...

TODAY
NW winds 20 to 25 kt, increasing to 25 to 30 kt this
afternoon. Seas 2 to 4 ft. A chance of snow showers this morning.
Light freezing spray this afternoon.

TONIGHT
NW winds 25 to 30 kt with gusts up to 35 kt. Seas 3 to
5 ft. Light freezing spray.

SUN
NW winds 25 to 30 kt with gusts up to 40 kt. Seas 4 to
6 ft. Light freezing spray.

SUN NIGHT
NW winds 20 to 25 kt with gusts up to 35 kt,
diminishing to 15 to 20 kt with gusts up to 25 kt after midnight.
Seas 3 to 5 ft. Light freezing spray.

MON
NW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas 2 to 3 ft.

MON NIGHT
N winds around 10 kt. Seas around 2 ft.

TUE
NE winds 10 to 15 kt. Seas around 2 ft. A chance of snow.
Vsby 1 to 3 NM.

TUE NIGHT THROUGH WED NIGHT
N 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.



ANZ233-240000-
Vineyard Sound-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...
...FREEZING SPRAY ADVISORY IN EFFECT FROM THIS EVENING THROUGH
SUNDAY MORNING...

TODAY
NW winds 20 to 25 kt with gusts up to 30 kt. Seas 2 to
3 ft. Light freezing spray. A slight chance of snow showers this
morning.

TONIGHT
NW winds around 25 kt with gusts up to 35 kt. Seas
3 to 4 ft. Light freezing spray.

SUN
NW winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to
5 ft. Light freezing spray.

SUN NIGHT
NW winds 20 to 25 kt, diminishing to 15 to 20 kt
after midnight. Gusts up to 30 kt. Seas 3 to 5 ft. Light freezing
spray.

MON
NW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas 2 to 3 ft.

MON NIGHT
N winds around 10 kt. Seas 1 foot or less.

TUE
NE winds 10 to 15 kt. Seas around 2 ft. A chance of snow
and rain. Vsby 1 to 3 NM.

TUE NIGHT THROUGH WED NIGHT
N 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.



ANZ234-240000-
Buzzards Bay-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...
...FREEZING SPRAY ADVISORY IN EFFECT FROM THIS EVENING THROUGH
SUNDAY MORNING...

TODAY
NW winds 15 to 20 kt, increasing to 20 to 25 kt this
afternoon. Gusts up to 30 kt. Seas 2 to 3 ft. A chance of
flurries this morning. Light freezing spray this afternoon.

TONIGHT
NW winds 20 to 25 kt with gusts up to 35 kt. Seas
around 3 ft. Light freezing spray.

SUN
NW winds around 20 kt with gusts up to 35 kt. Seas 3 to
4 ft. Light freezing spray.

SUN NIGHT
NW winds 15 to 20 kt. Gusts up to 30 kt, decreasing
to 20 kt after midnight. Seas 2 to 4 ft.

MON
NW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas around 2 ft.

MON NIGHT
N winds around 10 kt. Seas 1 foot or less.

TUE
NE winds 10 to 15 kt. Seas around 2 ft. A chance of snow.
Vsby 1 to 3 NM.

TUE NIGHT THROUGH WED NIGHT
N 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.



ANZ235-240000-
Rhode Island Sound-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...

TODAY
NW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to
5 ft. Light freezing spray.

TONIGHT
NW winds around 25 kt with gusts up to 35 kt. Seas
3 to 5 ft. Light freezing spray.

SUN
NW winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to
6 ft. Light freezing spray.

SUN NIGHT
NW winds 20 to 25 kt, diminishing to 15 to 20 kt
after midnight. Gusts up to 30 kt. Seas 4 to 6 ft. Light freezing
spray.

MON
NW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas 2 to 3 ft.

MON NIGHT
N winds around 10 kt. Seas around 2 ft.

TUE
NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of snow. Vsby 1 to 3 NM.

TUE NIGHT THROUGH WED NIGHT
N 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.



ANZ237-240000-
Block Island Sound-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...

TODAY
NW winds 20 to 25 kt, increasing to 25 to 30 kt this
afternoon. Seas 3 to 5 ft. Light freezing spray.

TONIGHT
NW winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to
5 ft. Light freezing spray.

SUN
NW winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to
5 ft. Light freezing spray.

SUN NIGHT
NW winds 20 to 25 kt, diminishing to 15 to 20 kt
after midnight. Gusts up to 30 kt. Seas 3 to 5 ft. Light freezing
spray.

MON
NW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas 2 to 3 ft.

MON NIGHT
N winds around 10 kt, becoming NE after midnight.
Seas around 2 ft.

TUE
NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of snow and rain. Vsby 1 to 3 NM.

TUE NIGHT THROUGH WED NIGHT
N 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.



ANZ230-240000-
Boston Harbor-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...

TODAY
NW winds 15 to 20 kt, increasing to 20 to 25 kt this
afternoon. Gusts up to 30 kt. Waves around 2 ft. A chance of
flurries this morning.

TONIGHT
NW winds 25 to 30 kt, diminishing to 20 to 25 kt after
midnight. Gusts up to 40 kt. Waves around 2 ft.

SUN
NW winds 20 to 25 kt with gusts up to 40 kt. Waves around
2 ft.

SUN NIGHT
NW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Gusts up to 30 kt. Waves around 2 ft.

MON
NW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Waves around 2 ft.

MON NIGHT
N winds 5 to 10 kt. Waves 1 foot or less.

TUE THROUGH WED NIGHT
N winds 5 to 10 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.



ANZ236-240000-
Narragansett Bay-
611 AM EST Sat Jan 23 2021

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
SUNDAY AFTERNOON...

TODAY
NW winds 20 to 25 kt with gusts up to 30 kt. Waves 2 to
3 ft. Light freezing spray this afternoon.

TONIGHT
NW winds 20 to 25 kt, diminishing to 15 to 20 kt after
midnight. Gusts up to 35 kt. Waves around 3 ft. Light freezing
spray.

SUN
NW winds 15 to 20 kt with gusts up to 35 kt. Waves around
3 ft. Light freezing spray.

SUN NIGHT
NW winds 15 to 20 kt with gusts up to 30 kt,
diminishing to 10 to 15 kt with gusts up to 20 kt after midnight.
Waves 2 to 3 ft.

MON
NW winds 5 to 10 kt. Waves 1 foot or less.

MON NIGHT
N winds 5 to 10 kt. Waves 1 foot or less.

TUE
NE winds around 10 kt. Waves 1 foot or less. A chance of
snow. Vsby 1 to 3 NM.

TUE NIGHT THROUGH WED NIGHT
N winds 5 to 10 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.



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