Gale Warning 19, NWS Boston/Norton, MA

330 
WHUS71 KBOX 180741
MWWBOX

URGENT - MARINE WEATHER MESSAGE
National Weather Service Boston/Norton MA
341 AM EDT Thu Jun 18 2026

ANZ250-280-182045-
/O.CON.KBOX.GL.W.0019.260618T1500Z-260619T0200Z/
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
Ocean Waters from the Merrimack River to Plymouth from 40 to
60 NM-
341 AM EDT Thu Jun 18 2026

...GALE WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
10 PM EDT THIS EVENING...

* WHAT...South winds 20 to 25 kt with gusts up to 40 kt and seas 
  5 to 8 feet expected.

* WHERE...In Massachusetts coastal waters, Coastal waters east 
  of Ipswich Bay and the Stellwagen Bank National Marine 
  Sanctuary. In Atlantic coastal waters, Ocean Waters from the 
  Merrimack River to Plymouth from 40 to 60 NM.

* WHEN...From 11 AM this morning to 10 PM EDT 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.

&&

$$

ANZ251-182045-
/O.CON.KBOX.GL.W.0019.260618T1500Z-260618T2300Z/
Massachusetts Bay and Ipswich Bay-
341 AM EDT Thu Jun 18 2026

...GALE WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 7 PM
EDT THIS EVENING...

* WHAT...South winds 20 to 25 kt with gusts up to 35 kt and seas 
  3 to 5 feet expected.

* WHERE...Massachusetts Bay and Ipswich Bay.

* WHEN...From 11 AM this morning to 7 PM EDT 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.

&&

$$

ANZ231>234-182045-
/O.CON.KBOX.GL.W.0019.260618T1500Z-260619T0200Z/
Cape Cod Bay-Nantucket Sound-Vineyard Sound-Buzzards Bay-
341 AM EDT Thu Jun 18 2026

...GALE WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
10 PM EDT THIS EVENING...

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

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

* WHEN...From 11 AM this morning to 10 PM EDT 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.

&&

$$

ANZ230-182045-
/O.CON.KBOX.GL.W.0019.260618T1700Z-260618T2300Z/
Boston Harbor-
341 AM EDT Thu Jun 18 2026

...GALE WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO
7 PM EDT THIS EVENING...

* WHAT...South winds 20 to 25 kt with gusts up to 35 kt and 
  waves around 2 feet expected.

* WHERE...Boston Harbor.

* WHEN...From 1 PM this afternoon to 7 PM EDT 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.

&&

$$

ANZ254-182045-
/O.EXT.KBOX.SC.Y.0067.260618T1700Z-260620T0000Z/
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 NM-
341 AM EDT Thu Jun 18 2026

...SMALL CRAFT ADVISORY NOW IN EFFECT FROM 1 PM THIS AFTERNOON TO
8 PM EDT FRIDAY...

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

* WHERE...Coastal waters from Provincetown MA to Chatham MA to 
  Nantucket MA out 20 NM.

* WHEN...From 1 PM this afternoon to 8 PM EDT Friday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

ANZ255-256-182045-
/O.CON.KBOX.SC.Y.0067.260618T1500Z-260620T0000Z/
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-
341 AM EDT Thu Jun 18 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING
TO 8 PM EDT FRIDAY...

* WHAT...Southwest winds 15 to 25 kt with a few gusts up to 35 kt
  and seas 5 to 8 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 11 AM this morning to 8 PM EDT Friday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

ANZ235-237-182045-
/O.CON.KBOX.SC.Y.0067.260618T1500Z-260620T0000Z/
Rhode Island Sound-Block Island Sound-
341 AM EDT Thu Jun 18 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING
TO 8 PM EDT FRIDAY...

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

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

* WHEN...From 11 AM this morning to 8 PM EDT Friday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

ANZ236-182045-
/O.CON.KBOX.SC.Y.0067.260618T1500Z-260618T2300Z/
Narragansett Bay-
341 AM EDT Thu Jun 18 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING
TO 7 PM EDT THIS EVENING...

* WHAT...South winds 20 to 25 kt with gusts up to 30 kt and 
  waves 3 to 5 feet expected.

* WHERE...Narragansett Bay.

* WHEN...From 11 AM this morning to 7 PM EDT this evening.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

224 
WHUS71 KBOX 181916
MWWBOX

URGENT - MARINE WEATHER MESSAGE
National Weather Service Boston/Norton MA
316 PM EDT Thu Jun 18 2026

ANZ250-280-190200-
/O.CON.KBOX.GL.W.0019.000000T0000Z-260619T0200Z/
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
Ocean Waters from the Merrimack River to Plymouth from 40 to
60 NM-
316 PM EDT Thu Jun 18 2026

...GALE WARNING REMAINS IN EFFECT UNTIL 10 PM EDT THIS EVENING...

* WHAT...South winds 20 to 25 kt with gusts up to 40 kt and seas 
  5 to 8 feet.

* WHERE...In Massachusetts coastal waters, Coastal waters east 
  of Ipswich Bay and the Stellwagen Bank National Marine 
  Sanctuary. In Atlantic coastal waters, Ocean Waters from the 
  Merrimack River to Plymouth from 40 to 60 NM.

* WHEN...Until 10 PM EDT 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.

&&

$$

ANZ251-182300-
/O.CON.KBOX.GL.W.0019.000000T0000Z-260618T2300Z/
Massachusetts Bay and Ipswich Bay-
316 PM EDT Thu Jun 18 2026

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

* WHAT...South winds 20 to 25 kt with gusts up to 35 kt and seas 
  3 to 5 feet.

* WHERE...Massachusetts Bay and Ipswich Bay.

* WHEN...Until 7 PM EDT 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.

&&

$$

ANZ231>234-190200-
/O.CON.KBOX.GL.W.0019.000000T0000Z-260619T0200Z/
Cape Cod Bay-Nantucket Sound-Vineyard Sound-Buzzards Bay-
316 PM EDT Thu Jun 18 2026

...GALE WARNING REMAINS IN EFFECT UNTIL 10 PM EDT THIS EVENING...

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

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

* WHEN...Until 10 PM EDT 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.

&&

$$

ANZ230-182300-
/O.CON.KBOX.GL.W.0019.000000T0000Z-260618T2300Z/
Boston Harbor-
316 PM EDT Thu Jun 18 2026

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

* WHAT...South winds 20 to 25 kt with gusts up to 35 kt and 
  waves around 2 feet.

* WHERE...Boston Harbor.

* WHEN...Until 7 PM EDT 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.

&&

$$

ANZ255-256-191115-
/O.CON.KBOX.SC.Y.0067.000000T0000Z-260620T0000Z/
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-
316 PM EDT Thu Jun 18 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY...

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

* 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...Until 8 PM EDT Friday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

ANZ254-191115-
/O.CON.KBOX.SC.Y.0067.000000T0000Z-260620T0000Z/
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 NM-
316 PM EDT Thu Jun 18 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY...

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

* WHERE...Coastal waters from Provincetown MA to Chatham MA to 
  Nantucket MA out 20 NM.

* WHEN...Until 8 PM EDT Friday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

ANZ235-237-191115-
/O.CON.KBOX.SC.Y.0067.000000T0000Z-260620T0000Z/
Rhode Island Sound-Block Island Sound-
316 PM EDT Thu Jun 18 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY...

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

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

* WHEN...Until 8 PM EDT Friday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

ANZ236-182300-
/O.CON.KBOX.SC.Y.0067.000000T0000Z-260618T2300Z/
Narragansett Bay-
316 PM EDT Thu Jun 18 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 7 PM EDT THIS
EVENING...

* WHAT...South winds 20 to 25 kt with gusts up to 30 kt and 
  waves 3 to 5 feet.

* WHERE...Narragansett Bay.

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

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

Area Forecast Discussion
National Weather Service Boston/Norton MA
743 PM EDT Wed Jun 17 2026

.WHAT HAS CHANGED...

Chance for severe weather continues to be present for Thursday
afternoon and evening. Damaging winds and an isolated tornado
are possible.

&&

.KEY MESSAGES...

- Gusty southerly winds with some showers and perhaps a few
  afternoon thunderstorms Thursday. Main threat for severe
  weather still looks to be to our west and south but is
  possible across SNE.

- Beautiful weather Fri into the weekend despite gusty west winds
  Fri-Sat. Highs mainly between 75 and 85 with low humidity.

- Potential for a much needed soaking rain to kick off the start of
  the next work week...But that is not set in stone.

&&

.DISCUSSION...

KEY MESSAGE 1...Gusty southerly winds with some showers and perhaps
a few afternoon thunderstorms Thursday. Main threat for severe
weather still looks to be to our west and south but is possible
across SNE.

After a mostly dry day Wednesday save for some isolated showers over
western/central MA our next impactful bout of weather arrives
overnight and Thursday. In the mid-levels a positively tilted trough
digs into the eastern Great Lakes early Thursday moving then over
New England later Thursday into Friday. This directs a plume of deep
moisture and strong low to mid level winds overhead. A strong W/SW
jet stretches from 850mb (50-60kts) to 500mb (80-95kts) contributing
to some very strong wind shear values. 0-6km bulk shear values are
on the order of 70-80kts with even more impressive low level shear
values (0-1km SRH 300-400m2s2). The limiting factor for severe
thunderstorm development will be (potentially) very marginal
instability. The previously mentioned LLJ will act on an early
morning warm front to bring a round of widespread showers and
potentially some embedded thunderstorms after midnight through mid
to late morning. These showers and associated lingering cloudcover
will act to limit heating and destabilization for some time. Much
will depend on if we get many breaks in the clouds in which highs
initially expected in the 70s could jump up coincident with higher
instability values. At the moment, thinking that the true warm
sector/highest instability values, and greatest severe potential
remains just to our south and west. However, it won't take much for
such a borderline atmospheric setup to become much more volatile.
Historically even low instability environments have been able to be
overcome by particularly strong shear, so a Slight Risk (level 2 of
5) of severe weather remains in effect. The greatest threat would be
from damaging winds, then tornado potential given the extreme low
level shear values. For SNE, the most likely intersection of
instability and strong shear (aka greatest severe threat) would be
western MA and western CT during the mid afternoon to early evening.
In sum, low confidence that severe weather materializes but high
potential impact if it does. Timing is generally noon to 9pm
(earlier west, later east).

Finally, regardless, Thursday will be gusty thanks to the strong LLJ
overhead. Much will depend on amount of clearing and resultant
diurnal heating as to how well the BL mixes, but BUFKIT soundings
indicate potential for wind gusts of 25 to 35 mph, even up to 40
mph at times.

KEY MESSAGE 2...Beautiful weather Fri into the weekend despite gusty
west winds Fri-Sat. Highs mainly between 75 and 85 with comfortable
humidity.

A beautiful post-frontal airmass works into southern New England Fri
and Sat. Low pressure tracking from Quebec into the Canadian
Maritimes will result in gusty west winds of 25 to 35 mph Fri/Sat
afternoons with perhaps even a few spots briefly gusting up to 40
mph. Winds should be a bit less on Sunday as the pressure gradient
weakens.

Otherwise...beautiful weather expected Fri into the weekend with
highs generally between 75 and 85 degrees and low humidity. Low
temps will be pleasant too...mainly in the 50s to the lower 60s.

The weather will be dry for all intensive purposes. Some moisture
starved northern stream energy may trigger a brief diurnally driven
spot shower or two this weekend. But again it is pretty much a
beautiful dry stretch of weather into the weekend.

KEY MESSAGE 3...Potential for a much needed soaking rain to
kick off the start of the next work week...But that is not set
in stone.

The potential continues for a much needed soaking rain to kick off
the start of the next work week...But that will depend upon the
track of low pressure. This still remains uncertain given these
tracks are usually impacted by convective processes this time of
year. Limited baroclinicity during the summer can also result in
more difficulties...Not to mention we are still 5 days out in the
future. Certainly the potential remains for a soaking rainfall and
some of our guidance continues to indicate that potential...But
whether or not that comes into fruition remains uncertain.

Drier and very pleasant summerlike weather should return Tue into
Wed as high pressure builds in from the west. Temperatures look to
be rather seasonable with comfortable humidity by the middle of next
week.

&&

.AVIATION /00Z THURSDAY THROUGH MONDAY/...

Forecaster Confidence Levels...

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

00z TAF Update...

Tonight...High Confidence.

Mainly VFR for most of tonight...But some scattered showers
along with localized MVFR conditions will be possible across the
interior after 08z/09z. S winds generally 10 knots or less.

Thursday...Moderate confidence.

A period of MVFR with even localized IFR conditions possible Thu
morning with a round of showers. While a few showers possible
anywhere Thu morning...the focus for them will likely be
northwest of I-95 and especially across interior MA. The main
threat for scattered showers and t-storms will be Thu
afternoon/early evening ahead of the cold front. A few strong to
severe thunderstorms are possible too...But that will depend on
how much instability is generated ahead of the front.

A strong LLJ will result in southerly wind gusts of 25 to 35
knots developing by afternoon with a few gusts perhaps near 40
knots. Localized/brief stronger winds possible if any severe
thunderstorms develop.

Thursday night...High confidence.

Any lingering SHRA/TSRA should depart the coast early-mid Thu
evening with conditions quickly improving to VFR. Lower
cigs/vsbys may linger until midnight or so for parts of the
Cape and Islands. SW winds 7-15 knots shift to the W overnight.

KBOS Terminal...Moderate confidence in TAF.

KBDL Terminal...Moderate confidence in TAF.

Outlook /Friday through Monday/...

Wednesday through Friday Night: VFR. Breezy.

Saturday: VFR. Windy with local gusts up to 30 kt.

Saturday Night: VFR. Breezy.

Sunday: VFR. Breezy. Slight chance SHRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Thursday night: High confidence.

Gusty southwest winds expected Thursday. Much will depend on
how warm we can get. Have high confidence in at least Small
Craft Advisory conditions, with moderate confidence for gale
force gusts across some of the eastern coastal waters. Gale
Watches expanded to interior easter MA waters where proximity to
land/better warming may help mix down marginal gale force
winds.

Outlook /Thursday Night through Monday/...

Thursday Night: Low risk for Small Craft Advisory winds with
gusts up to 30 kt. Rough seas up to 8 ft. Slight chance of rain
showers.

Juneteenth: Low risk for Small Craft Advisory winds with gusts
up to 25 kt. Rough seas up to 7 ft.

Friday Night through Saturday: Low risk for Small Craft
Advisory winds with gusts up to 25 kt. Seas up to 5 ft.

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

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory from 11 AM to 7 PM EDT Thursday for
     ANZ230-236.
     Gale Watch from Thursday morning through Thursday evening for
     ANZ231-234-250-251-280.
     Small Craft Advisory from 11 AM Thursday to 1 AM EDT Friday
     for ANZ232-233.
     Small Craft Advisory from 11 AM Thursday to 8 PM EDT Friday
     for ANZ235-237-255-256.
     Small Craft Advisory from 2 PM Thursday to 8 PM EDT Friday for
     ANZ254.

&&

DISCUSSION...BW/Frank
AVIATION...BW/Frank
MARINE...BW/Frank