Gale Warning 44, NWS Boston/Norton, MA

172 
WHUS71 KBOX 170506
MWWBOX

URGENT - MARINE WEATHER MESSAGE
National Weather Service Boston/Norton MA
1206 AM EST Wed Dec 17 2025

ANZ250-254-172200-
/O.CON.KBOX.GL.W.0044.000000T0000Z-251218T0600Z/
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1206 AM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT UNTIL 1 AM EST THURSDAY...

* WHAT...Southwest winds 15 to 25 kt with gusts up to 35 kt and 
  seas 4 to 7 feet.

* WHERE...Coastal waters east of Ipswich Bay and the Stellwagen 
  Bank National Marine Sanctuary and Coastal waters from 
  Provincetown MA to Chatham MA to Nantucket MA out 20 nm.

* WHEN...Until 1 AM EST Thursday.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ231-251-172200-
/O.CON.KBOX.GL.W.0044.000000T0000Z-251218T0000Z/
Cape Cod Bay-Massachusetts Bay and Ipswich Bay-
1206 AM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT UNTIL 7 PM EST THIS EVENING...

* WHAT...Southwest winds 15 to 25 kt with gusts up to 35 kt and 
  seas 3 to 5 feet.

* WHERE...Cape Cod Bay and Massachusetts Bay and Ipswich Bay.

* WHEN...Until 7 PM EST this evening.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ255-256-172200-
/O.CON.KBOX.GL.W.0044.251217T1200Z-251218T0600Z/
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1206 AM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT FROM 7 AM THIS MORNING TO 1 AM
EST THURSDAY...

* WHAT...West winds 15 to 25 kt with gusts up to 35 kt and seas 
  6 to 9 feet expected.

* WHERE...In Massachusetts coastal waters, Coastal Waters 
  extending out to 25 nm South of Marthas Vineyard and 
  Nantucket. In Rhode Island coastal waters, Coastal Waters from 
  Montauk NY to Marthas Vineyard extending out to 20 nm South of 
  Block Island.

* WHEN...From 7 AM this morning to 1 AM EST Thursday.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ232>235-237-172200-
/O.CON.KBOX.GL.W.0044.251217T1200Z-251218T0000Z/
Nantucket Sound-Vineyard Sound-Buzzards Bay-Rhode Island Sound-
Block Island Sound-
1206 AM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT FROM 7 AM THIS MORNING TO 7 PM
EST THIS EVENING...

* WHAT...Southwest winds 20 to 25 kt with gusts up to 35 kt and 
  seas 4 to 6 feet expected.

* WHERE...In Massachusetts coastal waters, Nantucket Sound, 
  Vineyard Sound and Buzzards Bay. In Rhode Island coastal 
  waters, Rhode Island Sound and Block Island Sound.

* WHEN...From 7 AM this morning to 7 PM EST this evening.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ230-236-172200-
/O.CON.KBOX.GL.W.0044.251217T1200Z-251218T0000Z/
Boston Harbor-Narragansett Bay-
1206 AM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT FROM 7 AM THIS MORNING TO 7 PM
EST THIS EVENING...

* WHAT...Southwest winds 15 to 20 kt with gusts up to 30 kt and 
  waves 2 to 4 feet expected.

* WHERE...In Massachusetts coastal waters, Boston Harbor. In 
  Rhode Island coastal waters, Narragansett Bay.

* WHEN...From 7 AM this morning to 7 PM EST this evening.

* IMPACTS...Strong winds will cause hazardous waves which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

501 
WHUS71 KBOX 172239
MWWBOX

URGENT - MARINE WEATHER MESSAGE
National Weather Service Boston/Norton MA
539 PM EST Wed Dec 17 2025

ANZ250-254-181145-
/O.CON.KBOX.GL.W.0044.000000T0000Z-251218T0600Z/
/O.NEW.KBOX.GL.A.0027.251219T0600Z-251220T1200Z/
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
539 PM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT UNTIL 1 AM EST THURSDAY...
...GALE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH SATURDAY
MORNING...

* WHAT...For the Gale Warning, west winds 15 to 25 kt with gusts
  up to 30 kt and seas 4 to 6 feet. For the Gale Watch, southwest
  winds 25 to 35 kt with gusts 40-50 kt and seas 6 to 11 feet 
  possible. 

* WHERE...Coastal waters east of Ipswich Bay and the Stellwagen 
  Bank National Marine Sanctuary and Coastal waters from 
  Provincetown MA to Chatham MA to Nantucket MA out 20 nm.

* WHEN...For the Gale Warning, until 1 AM EST Thursday. For the 
  Gale Watch, from late Thursday night through Saturday morning.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ231-181145-
/O.CON.KBOX.GL.W.0044.000000T0000Z-251218T0000Z/
/O.NEW.KBOX.GL.A.0027.251219T1000Z-251220T1200Z/
Cape Cod Bay-
539 PM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT UNTIL 7 PM EST THIS EVENING...
...GALE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH SATURDAY
MORNING...

* WHAT...For the Gale Warning, southwest winds around 20 kt with 
  gusts up to 25 kt and seas around 3 feet. For the Gale Watch, 
  southwest winds 25 to 30 kt with gusts up to 45 kt and seas 4 
  to 6 feet possible.

* WHERE...Cape Cod Bay.

* WHEN...For the Gale Warning, until 7 PM EST this evening. For 
  the Gale Watch, from late Thursday night through Saturday 
  morning.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ251-181145-
/O.CON.KBOX.GL.W.0044.000000T0000Z-251218T0000Z/
/O.NEW.KBOX.GL.A.0027.251219T1000Z-251220T1200Z/
Massachusetts Bay and Ipswich Bay-
539 PM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT UNTIL 7 PM EST THIS EVENING...
...GALE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH SATURDAY
MORNING...

* WHAT...For the Gale Warning, southwest winds 15 to 20 kt with 
  gusts up to 25 kt and seas around 3 feet. For the Gale Watch, 
  southwest winds 25 to 30 kt with gusts up to 45 kt and seas 4 
  to 7 feet possible.

* WHERE...Massachusetts Bay and Ipswich Bay.

* WHEN...For the Gale Warning, until 7 PM EST this evening. For 
  the Gale Watch, from late Thursday night through Saturday 
  morning.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ255-256-181145-
/O.CON.KBOX.GL.W.0044.000000T0000Z-251218T0600Z/
/O.NEW.KBOX.GL.A.0027.251219T0600Z-251220T1200Z/
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
539 PM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT UNTIL 1 AM EST THURSDAY...
...GALE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH SATURDAY
MORNING...

* WHAT...For the Gale Warning, west winds 20 to 30 kt and seas 6
  to 9 feet. For the Gale Watch, southwest winds 30 to 40 kt with
  gusts up to 45 kt and seas 11 to 16 feet possible. Isolated
  gusts up to 50 kts possible. 

* WHERE...In Massachusetts coastal waters, Coastal Waters 
  extending out to 25 nm South of Marthas Vineyard and 
  Nantucket. In Rhode Island coastal waters, Coastal Waters from 
  Montauk NY to Marthas Vineyard extending out to 20 nm South of 
  Block Island.

* WHEN...For the Gale Warning, until 1 AM EST Thursday. For the 
  Gale Watch, from late Thursday night through Saturday morning.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ232>234-181145-
/O.CON.KBOX.GL.W.0044.000000T0000Z-251218T0000Z/
/O.NEW.KBOX.GL.A.0027.251219T1000Z-251220T1200Z/
Nantucket Sound-Vineyard Sound-Buzzards Bay-
539 PM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT UNTIL 7 PM EST THIS EVENING...
...GALE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH SATURDAY
MORNING...

* WHAT...For the Gale Warning, southwest winds 20 to 25 kt with 
  gusts up to 30 kt and seas 3 to 5 feet. For the Gale Watch, 
  southwest winds 25 to 35 kt with gusts up to 45 kt and seas 5 
  to 8 feet possible.

* WHERE...Nantucket Sound, Vineyard Sound and Buzzards Bay.

* WHEN...For the Gale Warning, until 7 PM EST this evening. For 
  the Gale Watch, from late Thursday night through Saturday 
  morning.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ235-237-181145-
/O.CON.KBOX.GL.W.0044.000000T0000Z-251218T0000Z/
/O.NEW.KBOX.GL.A.0027.251219T0900Z-251220T1200Z/
Rhode Island Sound-Block Island Sound-
539 PM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT UNTIL 7 PM EST THIS EVENING...
...GALE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH SATURDAY
MORNING...

* WHAT...For the Gale Warning, west winds 20 to 25 kt with gusts
  up to 30 kt and seas 5 to 7 feet. For the Gale Watch, southwest
  winds 25 to 35 kt with gusts up to 45 kt and seas 7 to 12 feet
  possible. Isolated gusts to 50 kts possible. 

* WHERE...Rhode Island Sound and Block Island Sound.

* WHEN...For the Gale Warning, until 7 PM EST this evening. For 
  the Gale Watch, from late Thursday night through Saturday 
  morning.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ230-181145-
/O.CON.KBOX.GL.W.0044.000000T0000Z-251218T0000Z/
/O.NEW.KBOX.GL.A.0027.251219T1200Z-251220T1200Z/
Boston Harbor-
539 PM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT UNTIL 7 PM EST THIS EVENING...
...GALE WATCH IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY
MORNING...

* WHAT...For the Gale Warning, southwest winds 15 to 20 kt with 
  gusts up to 25 kt and waves around 2 feet. For the Gale Watch, 
  southwest winds 20 to 30 kt with gusts up to 40 kt and waves 
  around 2 feet possible.

* WHERE...Boston Harbor.

* WHEN...For the Gale Warning, until 7 PM EST this evening. For 
  the Gale Watch, from Friday morning through Saturday morning.

* IMPACTS...Strong winds will cause hazardous waves which could 
  capsize or damage vessels and reduce visibility.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ236-181145-
/O.CON.KBOX.GL.W.0044.000000T0000Z-251218T0000Z/
/O.NEW.KBOX.GL.A.0027.251219T1000Z-251220T0600Z/
Narragansett Bay-
539 PM EST Wed Dec 17 2025

...GALE WARNING REMAINS IN EFFECT UNTIL 7 PM EST THIS EVENING...
...GALE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH LATE
FRIDAY NIGHT...

* WHAT...For the Gale Warning, southwest winds 15 to 20 kt with 
  gusts up to 25 kt and waves 2 to 4 feet. For the Gale Watch, 
  southwest winds 20 to 30 kt with gusts up to 45 kt and waves 4 
  to 7 feet possible.

* WHERE...Narragansett Bay.

* WHEN...For the Gale Warning, until 7 PM EST this evening. For 
  the Gale Watch, from late Thursday night through late Friday 
  night.

* IMPACTS...Strong winds will cause hazardous waves which could
  capsize or damage vessels and reduce visibility.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

852 
WHUS71 KBOX 180527
MWWBOX

URGENT - MARINE WEATHER MESSAGE
National Weather Service Boston/Norton MA
1227 AM EST Thu Dec 18 2025

ANZ256-182100-
/O.CAN.KBOX.GL.W.0044.000000T0000Z-251218T0600Z/
/O.UPG.KBOX.GL.A.0027.251219T0600Z-251220T1200Z/
/O.NEW.KBOX.GL.W.0045.251219T0800Z-251220T1200Z/
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1227 AM EST Thu Dec 18 2025

...GALE WARNING IN EFFECT FROM 3 AM FRIDAY TO 7 AM EST SATURDAY...

* WHAT...Southwest winds 30 to 40 kt with gusts up to 45 kt and 
  seas 10 to 15 feet expected.

* WHERE...Coastal Waters from Montauk NY to Marthas Vineyard 
  extending out to 20 nm South of Block Island.

* WHEN...From 3 AM Friday to 7 AM EST Saturday.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ250-182100-
/O.CAN.KBOX.GL.W.0044.000000T0000Z-251218T0600Z/
/O.UPG.KBOX.GL.A.0027.251219T0600Z-251220T1200Z/
/O.NEW.KBOX.GL.W.0045.251219T1000Z-251220T1200Z/
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1227 AM EST Thu Dec 18 2025

...GALE WARNING IN EFFECT FROM 5 AM FRIDAY TO 7 AM EST SATURDAY...

* WHAT...Southwest winds 30 to 40 kt with gusts up to 50 kt and 
  seas 6 to 11 feet expected.

* WHERE...Coastal waters east of Ipswich Bay and the Stellwagen 
  Bank National Marine Sanctuary.

* WHEN...From 5 AM Friday to 7 AM EST Saturday.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ254-255-182100-
/O.CAN.KBOX.GL.W.0044.000000T0000Z-251218T0600Z/
/O.UPG.KBOX.GL.A.0027.251219T0600Z-251220T1200Z/
/O.NEW.KBOX.SR.W.0005.251219T1400Z-251219T2000Z/
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1227 AM EST Thu Dec 18 2025

...STORM WARNING IN EFFECT FROM 9 AM TO 3 PM EST FRIDAY...
...GALE WARNING IS CANCELLED...

* WHAT...South winds 30 to 35 kt with gusts up to 50 kt and seas 
  8 to 13 feet expected.

* WHERE...Coastal waters from Provincetown MA to Chatham MA to 
  Nantucket MA out 20 nm and Coastal Waters extending out to 25 
  nm South of Marthas Vineyard and Nantucket.

* WHEN...From 9 AM to 3 PM EST Friday.

* IMPACTS...Storm force winds and hazardous seas will capsize or 
  damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should remain in port, alter course, and/or secure the
vessel for severe conditions.

&&

$$

ANZ235-237-182100-
/O.UPG.KBOX.GL.A.0027.251219T0900Z-251220T1200Z/
/O.NEW.KBOX.GL.W.0045.251219T0800Z-251220T1200Z/
Rhode Island Sound-Block Island Sound-
1227 AM EST Thu Dec 18 2025

...GALE WARNING IN EFFECT FROM 3 AM FRIDAY TO 7 AM EST SATURDAY...

* WHAT...Southwest winds 25 to 35 kt with gusts up to 45 kt and 
  seas 8 to 13 feet expected.

* WHERE...Rhode Island Sound and Block Island Sound.

* WHEN...From 3 AM Friday to 7 AM EST Saturday.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ236-182100-
/O.UPG.KBOX.GL.A.0027.251219T1000Z-251220T0600Z/
/O.NEW.KBOX.GL.W.0045.251219T1000Z-251220T0600Z/
Narragansett Bay-
1227 AM EST Thu Dec 18 2025

...GALE WARNING IN EFFECT FROM 5 AM FRIDAY TO 1 AM EST SATURDAY...

* WHAT...Southwest winds 25 to 35 kt with gusts up to 45 kt and 
  waves 4 to 7 feet expected.

* WHERE...Narragansett Bay.

* WHEN...From 5 AM Friday to 1 AM EST Saturday.

* IMPACTS...Strong winds will cause hazardous waves which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ251-182100-
/O.UPG.KBOX.GL.A.0027.251219T1000Z-251220T1200Z/
/O.NEW.KBOX.GL.W.0045.251219T1000Z-251220T1200Z/
Massachusetts Bay and Ipswich Bay-
1227 AM EST Thu Dec 18 2025

...GALE WARNING IN EFFECT FROM 5 AM FRIDAY TO 7 AM EST SATURDAY...

* WHAT...Southwest winds 25 to 35 kt with gusts up to 45 kt and 
  seas 4 to 7 feet expected.

* WHERE...Massachusetts Bay and Ipswich Bay.

* WHEN...From 5 AM Friday to 7 AM EST Saturday.

* IMPACTS...Strong winds will cause hazardous seas which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ230-182100-
/O.UPG.KBOX.GL.A.0027.251219T1200Z-251220T1200Z/
/O.NEW.KBOX.GL.W.0045.251219T1000Z-251220T1200Z/
Boston Harbor-
1227 AM EST Thu Dec 18 2025

...GALE WARNING IN EFFECT FROM 5 AM FRIDAY TO 7 AM EST SATURDAY...

* WHAT...Southwest winds 20 to 30 kt with gusts up to 40 kt and 
  waves around 2 feet expected.

* WHERE...Boston Harbor.

* WHEN...From 5 AM Friday to 7 AM EST Saturday.

* IMPACTS...Strong winds will cause hazardous waves which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

ANZ232>234-182100-
/O.UPG.KBOX.GL.A.0027.251219T1000Z-251220T1200Z/
/O.NEW.KBOX.SR.W.0005.251219T1400Z-251219T2000Z/
Nantucket Sound-Vineyard Sound-Buzzards Bay-
1227 AM EST Thu Dec 18 2025

...STORM WARNING IN EFFECT FROM 9 AM TO 3 PM EST FRIDAY...

* WHAT...South winds 30 to 35 kt with gusts up to 50 kt and seas 
  6 to 9 feet expected.

* WHERE...Nantucket Sound, Vineyard Sound and Buzzards Bay.

* WHEN...From 9 AM to 3 PM EST Friday.

* IMPACTS...Storm force winds and hazardous seas will capsize or 
  damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should remain in port, alter course, and/or secure the
vessel for severe conditions.

&&

$$

ANZ231-182100-
/O.UPG.KBOX.GL.A.0027.251219T1000Z-251220T1200Z/
/O.NEW.KBOX.SR.W.0005.251219T1400Z-251219T2000Z/
Cape Cod Bay-
1227 AM EST Thu Dec 18 2025

...STORM WARNING IN EFFECT FROM 9 AM TO 3 PM EST FRIDAY...

* WHAT...South winds 30 to 35 kt with gusts up to 55 kt and seas 
  4 to 6 feet expected.

* WHERE...Cape Cod Bay.

* WHEN...From 9 AM to 3 PM EST Friday.

* IMPACTS...Storm force winds and hazardous seas will capsize or 
  damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should remain in port, alter course, and/or secure the
vessel for severe conditions.

&&

$$

Area Forecast Discussion
National Weather Service Boston/Norton MA
1212 PM EST Tue Dec 16 2025

.WHAT HAS CHANGED...
Confidence continues to increase for potential wind and minor
coastal flood impacts Thursday night into Friday.

&&

.KEY MESSAGES...
- Strong and possibly damaging winds possible late Thursday
  night into Friday with Gale force winds on MA/RI waters.

- Minor coastal flooding possible along south facing shores
  around high tide Friday morning.

&&

.DISCUSSION...
KEY MESSAGE 1...Strong and possibly damaging winds.

Main concern for this forecast is a "warmer" storm system that
is expected to track through the Great Lakes and swing a strong
cold front through southern New England Friday morning. Models
are in good agreement in showing a 500 mb trough becoming
negatively tilted as it rotates through New England, with decent
moisture transport and a fairly robust wind field aloft with
60-80kt low level jet at 925 and 850 mb, though we're seeing a
trend that these stronger lower level winds will materialize as
system reaches Gulf of Maine, and as a result, NBMv4.3
probabilities for 50+ mph winds have come down a bit since
yesterday, although NBMv5.0 shows better potential especially
across RI and SE MA as well as coastal waters.

Taking a look at ensemble wind probabilities and a cursory look
at NAM/GFS forecast soundings gives higher confidence for
southerly gusts in 40-50 mph range late Thursday night into
Friday, but if we can warm into upper 50s Friday morning, we
would be able to more easily mix down 50-60 mph winds which
would increase the potential for wind damage. Additionally, we
will need to keep an eye on possibility of a fine line of
convection developing along cold front as it crosses SNE Friday
morning which could bring brief downpours and stronger wind
gusts but that is highly dependent upon having some instability,
something that can be seen on 00z RRFS which has 100-200 J/kg
of MUCAPE.

Behind front, cold advection takes hold with W/NW winds
potentially gusting to 40-50 mph, especially across higher
terrain and near coast (and on coastal waters) due to deepening
mixed layer and strong pressure rises. Another shot of cold
arrives Friday afternoon into Saturday, albeit not as cold as
what we just experienced.

KEY MESSAGE 2...Minor coastal flooding.

Confidence is lower than with wind impacts described above due
to timing of when highest surge will arrive and if it will
coincide with high tide along South Coast Friday morning,
roughly between 6 and 8 AM. This is tied to how quickly stronger
winds can ramp up and to some extent offshore seas as well.

If everything comes together, the worst case scenario would be
for minor coastal flooding along South Coast (less than 1 foot
deep on vulnerable shore roads) since we would need a surge
close to 3 ft. Stevens Institute ensemble guidance shows a
potential 1-2 ft surge while P-ETSS is under 1 ft and probably
underdone. Erosion should not be much of a factor given offshore
seas of 10-15 ft and only this high tide cycle being affected.

&&

.AVIATION /18Z TUESDAY THROUGH SUNDAY/...
Forecaster Confidence Levels...

Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.

18z TAF Update: High confidence.

VFR through the TAF period. Light SW winds today and tonight.
Winds at 2kft increase to 35-45 knots early wednesday morning
out of the SW. This will bring windshear concerns until late
morning when diurnal mixing kicks in. Winds Wednesday afternoon
will then gust up to 30-35 knots from the SW. Winds gradually
diminish wednesday night.

KBOS Terminal...High confidence in TAF.

VFR. Windshear possible tonight as winds aloft increase to 35-40
knots, but surface winds should be able to catch up with winds
aloft by mid morning.

KBDL Terminal...High confidence in TAF.

VFR. Windshear possible tonight as winds aloft increase to 35-40
knots, but surface winds should be able to catch up with winds
aloft by mid morning.

Outlook /Thursday through Saturday/...

Wednesday Night through Thursday: VFR. Breezy.

Thursday Night: MVFR/IFR conditions possible. Strong winds with
gusts up to 45 kt. Chance RA.

Friday: Mainly MVFR, with local IFR possible. Strong winds with
gusts up to 45 kt. Chance RA.

Friday Night: VFR. Windy with gusts up to 35 kt.

Saturday: VFR. Breezy.

&&

.MARINE...
Forecaster Confidence Levels...

Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.

Today Through Wednesday Night...High confidence.

Calm winds and seas today with high pressure overhead.
Increasing SW winds tonight into tomorrow with gale force wind
gusts likey through Wednesday evening. Seas increase to 8-10
feet in the southern waters, and 6-8 feet in the eastern waters.

Outlook /Thursday through Saturday/...

Wednesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Local rough seas.

Thursday: Winds less than 25 kt. Areas of seas approaching
5 ft.

Thursday Night: Moderate risk for gale force winds with gusts
up to 45 kt. Rough seas up to 14 ft. Chance of rain.

Friday: gale force winds with gusts up to 45 kt. Rough seas up
to 16 ft. Rain.

Friday Night: Strong winds with areas of gusts up to 45 kt.
Rough seas up to 13 ft. Slight chance of rain.

Saturday: Winds less than 25 kt. Seas up to 5 ft.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory from 3 AM to 4 PM EST Wednesday for
     ANZ230.
     Small Craft Advisory from midnight tonight to 10 PM EST
     Wednesday for ANZ231-251.
     Small Craft Advisory from 1 AM to 10 PM EST Wednesday for
     ANZ232>235-237.
     Small Craft Advisory from 3 AM to 6 PM EST Wednesday for
     ANZ236.
     Small Craft Advisory from midnight tonight to 6 AM EST
     Thursday for ANZ250-254>256.

&&

DISCUSSION...JWD
AVIATION...KP
MARINE...KP