Special Weather Statement, NWS Boston/Norton, MA

Area Forecast Discussion
National Weather Service Boston/Norton MA
149 PM EDT Thu Aug 12 2021

.SYNOPSIS...
A multiple-day stretch of oppressive to dangerous heat and
humidity continues today, expected into at least Friday. Today
will be the most dangerous in terms of the heat and humidity
with heat indices forecast to be as high as 109 degrees. Strong
to severe thunderstorms are possible this afternoon which could
produce damaging winds. Friday will also see oppressive heat
indices but may not be as high as today. Potential for more
widespread rainfall late on Friday through Saturday as a cold
front moves through. This will break the heat/humidity. Drier
with a more seasonable airmass Sunday into early next week.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
150 PM Update...

Early afternoon showers have started to fire up northwest of
Albany, NY but we aren't seeing any lightning cloud flashes yet.
Where we are seeing robust storms are in north central and
western Pennsylvania [where a remnant EML is located]. The 12z
CAMs show a line of showers and storms racing through western
Southern New England between 4pm and 8pm. There is still
discrepancies with these convective models on whether we see a
secondary line of showers developing just south of the Mass Pike
a little later this evening. How much of this action that makes
it to the coast is still too fuzzy because many of the models
show what ever line of storms fading before reaching Boston.
What concerns us is the anomolous air mass and instability
across the area... if these storms continue to develop and speed
up they could interact with some of the higher instability
across southern New England and become strong to severe. At this
rate the biggest concern with any strong storms would be
damaging straight-line winds.

As for temperatures we continue on track with many locations in
the low and middle 90s... the cool spots area along the south
coast where the current temperatures as of 145pm are 79F at
Nantucket, 81F at Block Island, and 82F at Newport.

==================================================================

1010 AM Update...

Temperatures are quickly climbing this morning with many
locations reaching the the low 80s and dew points in the low
70s! The 12z sounding from Albany shows +18C to +20C at 850mb
which does support temperatures reaching the middle 90s! Dew
points are still on track to reach the low to middle 70s as
well, which prompted the Excessive Heat Warning for those heat
indicies to 105F! Those who aren't under the Excessive Heat
Warning are still under a Heat Advisory... no matter how you
look at it, it's going to be HOT.

The second thing on our radar is the threat for strong storms
this afternoon. Forecast models have huge values of CAPE across
NY and western New England... but there isn't much forcing which
remains an issue. The 12z soundings from ALY and BUF have not
one but two inversions this morning that we will need to
overcome. But with daytime heating reaching well into the 90s we
should overcome that CAP.

Some of the latest 12z guidance is starting to roll in and show
the development of showers and storms across NY before moving
into western MA late this afternoon. Looking at the FV3 it would
bring in a few robust showers around 22z-00z before quickly
decaying. There still remains a fair amount of on certainty with
the forecast and we hope to have a better grasp once the full
suite of guidance is available.

==================================================================

Discussion from 4 AM...

** Dangerous Heat Expected Today **
** Strong to Severe Thunderstorms with Damaging Winds Late Today
into Tonight N/W of I-95 **

Won't bury the lead here. If you thought Wednesday was
oppressively hot, today will be be even hotter than Wednesday
and quite likely to be the hottest day yet experienced this
summer, on both an actual air temperature and perceived/heat
index basis. With similar dewpoints in the mid 70s, this will
contribute to heat indices that should reach dangerous levels to
those outdoors.

There were no changes to the heat headlines valid for today.
Excessive Heat Warnings remain in effect for much of Southern New
England, while Heat Advisories continue for much of the South Coast
and the Berkshires.

It's a very muggy and warm start early this morning across Southern
New England, with temps in the mid to upper 70s being common. Skies
were generally mostly clear for most, though areas of fog and low
clouds continued across much of southeast New England. Dense Fog
Advisories were in effect for this area until 8 AM, though
visibilities have been trending toward improvement and that should
be the trend into the mid morning. Though lower clouds may still
linger near or just offshore of Cape Cod, we are looking at full sun
for much of the day across the remainder of Southern New England.
850 mb temps are still in the lower 20s Celsius range, which
supports highs being a few degrees warmer than yesterday reaching
into the mid to in some cases upper 90s for most of the interior,
and the mid 80s across Cape Cod. No significant change to peak heat
indices in the mid to upper 100s for most of the interior (excluding
the upper 90s in the Berkshires and south coastal New England). Even
in Barnstable County, heat indices may reach the mid 90s but will
fall just short of both one day heat advisory criteria of 100F or
the two-consecutive day criteria of 95-99F.

The next concern is the potential for severe weather this afternoon.
Despite wind fields still being on the weaker side, the instability
forecast for this afternoon is very strong and is even more so
across NY. This is due to the very hot and humid conditions and the
presence of steeper mid-level lapse rates. 100-mb mixed layer CAPE
values are forecast around 2500-3500 J/kg in western and central MA
into CT, and around 1000-1500 J/kg across southeast New England and
parts of RI. The uncertainty in the forecast revolves around when
storms may develop and that will likely dictate how far east the
severe threat may extend. A number of convective permitting models
simulate initial storms around early to mid afternoon across central
NY, merging quickly into a line of storms with bowing segments
depicted moving eastward into eastern NY, western and central MA
into northern CT between ~22-02z (5-10 PM). Did coordinate with SPC
and neighboring WFOs about raising the severe risk to Slight
Risk/15% into our western and central counties and a more
conditional Marginal risk to the eastern MA coast. While the most
evident severe risk lies in NY, some will likely bleed over into
Southern New England. Despite weak wind fields, this is a still a
favorable parameter space for severe storms. It's difficult to
really message the scope of the risk given the uncertainties in the
timing. While gusty to locally damaging winds and heavy rain are the
main risks, given the depictions in the higher res models and the
level of instability that is forecast, it is not out of the realm of
possibility that corridors of enhanced wind damage could ensue into
our western-central MA/CT counties, especially if storms develop
earlier than anticipated. Please keep close tabs on the thunderstorm
forecast this afternoon.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/...
Tonight:

Still possible a convective complex or line of storms capable of
wind damage and heavy rain is ongoing and/or set to move in from
eastern NY. Given the amount of forecast instability and the mid-
level lapse rates, thunderstorms may continue into well into the
first part of the night. However the trend for the second part of
the night is for weakening and at least some cloud clearing. Fog and
lower clouds should again affect portions of the South Coast, Cape
Cod and the Islands. A very warm and muggy night with lows in the
mid 70s for most, close to surface dewpoints.

Friday:

Friday still looks to feature hot and humid weather leading to
another day of oppressive heat indices. Full or mostly full sunshine
and 850 mb temps around +19 to +21C should support high temperatures
similar if slightly lower than today - low to mid 90s in the
interior, mid 80s Cape/Islands.

I opted to hold on to the Excessive Heat Watch with this package,
mostly due to confidence not being sufficiently high enough to make
changes to it, and that there are already active Advisory/Warning
products in effect for the Today portion of the forecast.
Semantically, maybe it doesn't make too much of a difference - it
will be hot and still fairly humid. However there were two things
that introduce more uncertainty on the heat index values getting to
excessively high levels. The first one is questions on cloud cover
from any convection left behind from the today/overnight period. But
the bigger one is that there is greater potential for mixing of
lower dewpoints and also an element of drying off WSW downsloping
winds. This mixing is shown really well on BUFKIT forecast soundings
even off the more bullish/moister NAM. Unlike today where mid 70s
dewpoints should be fairly common, we may only be in the upper 60s
to lower 70s range for Friday. That may push heat indices more into
the Advisory to borderline Excessive Heat level. Given this, felt it
best to keep the Watch going and let later shifts make a final
decision on its status. Will point out that the difference in heat
index values Friday to today may only be about 5 degrees or so. It
will still be oppressive to those outdoors.

Friday may also feature another round of scattered strong
thunderstorms. The southern extent of geopotential heights
associated with broad upper level low should induce somewhat
stronger mid-level winds than today as well as a more favorable
track for remnant outflows or weak shortwave disturbances to
traverse through. However lapse rates in mid-levels are weaker, and
the lower dewpoints as mentioned cut into the degree of instability
to something more in the 1000-2000 J/kg CAPE range. And the warmer
temperatures may also keep an element of capping around until late
in the day. Opted to keep the forecast dry for most of the day, but
then increased PoPs into the lower end Chance range by mid-afternoon
when some of the higher res guidance shows greater prospects for
convective activity into our western/central areas. SPC did expand
the 5% severe probability/Marginal Risk area a little further
eastward for Friday. Strong to locally damaging winds and brief
heavy rain would be the main risks.

&&

.LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/...
Highlights

* Cold front moving through Friday night and Saturday bringing
  showers and storms. Will have to deal with another day of muggy
  weather before becoming more seasonable once the front passes.

* Dry and quiet weather with seasonable temperatures on Sunday into
  early next week. Could potentially see showers return to the
  forecast by mid week.

Friday night through Saturday...

Shortwave trough lifting through Friday night into early Saturday.
Will have a more substantial trough digging into the eastern Great
Lakes/Ontario/Quebec. The trough lifts into northern New England
late on Saturday. At the surface a pre-frontal trough will be in
place until the cold front begins pushing in from the west. The
front gradually moves through on Saturday.

May be dealing with leftover convection that develops on Friday into
Friday night, but this will also impact how things evolve with the
cold front sweeping through. Bit of a split amongst guidance with
how things evolve. Essentially all of the deterministic guidance
except for the ECMWF paints a drier picture. Looks like convection
diminishes Friday night into Saturday and as the front moves through
we could potentially stay dry and storms fire in the Mid Atlantic
robbing us of the moisture. Models on the drier side show dew points
ranging from the upper 60s to low 70s. The wetter solution in this
case in the ECMWF which has dew points solidly in the low to mid
70s. Would tend to lean on the drier solution, but there are better
dynamics in place compared to past few days with a 80+ kt jet
lifting across the eastern Great Lakes into northern New England and
far eastern Canada. Given the uncertainty have slight chance to
chances of precipitation especially with the front passing through.

Will have better deep layer shear in place during this timeframe
with 0-6 km bulk shear of 25-40 kts with the higher values across
western portions of the CWA. The question will be with respect to
instability as it diminishes as higher shear is moving in, though it
is still respectable with a few hundred to around 2000 J/kg of
MUCAPE. Fortunately, the mid level lapse rates are poor around 5-6
degrees Celsius per km and low level lapse rates ranging from 5-8
degrees Celsius per km. Not completely out of the question we have
some strong to severe storms in this environment, but will need the
shear/instability to overlap. Will be something to figure out in
future updates given the uncertainty at this time.

Temperatures are also uncertain given the dry versus wet forecast.
The ECMWF features more expansive cloud cover compared to other
pieces of guidance, which makes sense given the wetter forecast it
portrays. Will have 925 hPa temps of 20-25 Celsius with W/NW flow
bringing downsloping. Leaned on the NBM guidance which keeps temps
in the 80s across the region, but if more sun breaks out it is
definitely not out of the question for more widespread 90 degree
readings. Right now probabilities of temps AOA 90 degrees per the
EPS/GEFS are around 10-20 percent around the Merrimack and CT River
Valley. Given the dew points coupled with the temps there may be the
need for Heat Advisories ahead of the front.

Sunday through Wednesday...

Trough over northern New England lifts into northeastern Canada
early on Sunday. Behind the trough, the ridge axis builds into the
Mid Atlantic and eastern Great Lakes into early next week. By mid
week a broad trough lifts into the Great Lakes and may bring the
next shot of precipitation. High pressure builds in at the surface
on Sunday and Monday before shifting offshore by Tuesday and
Wednesday.

Much more seasonable airmass in place during this timeframe. Winds
remain light out of the NW to W on Sunday and Monday with 925 hPa
temps in the 15-20 degree Celsius range. Flow becomes more westerly
on Tuesday and southerly by Wednesday, which will advect in 20-24
degree Celsius temperatures at 925 hPa. The result temperature wise
are highs in the 70s to low 80s on Sunday/Monday and lower to mid
80s on Tuesday/Wednesday. Dew points remain comfortable throughout
this period, but will start getting more of the muggy feel by
Wednesday.

Looks like the next opportunities for precip return late on Tuesday
into Wednesday as a trough lifts in from the Great Lakes. May also
see this feature tapping into the moisture associated with Fred, but
it is still several days out so confidence is quite low.

&&

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

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

Today...Moderate confidence late afternoon into the evening.

VFR conditions expected for most locations today. As the
previous shift mentioned the uncertainty in the aviation
forecast revolves around the afternoon/evening thunderstorm
potential and timing. There is reasonably strong confidence in a
line of strong to severe thunderstorms developing ~18-20z in NY
expected to move east, but questions on when and how far east
will storms progress. At the moment best chance for storms prior
to 00Z is BAF-BDL eastward to perhaps ORH; but some lesser risk
exists eastward all the way to BOS if initial storms can
develop on the earlier end of that timeframe. For now have kept
VCTS only at BAF/BDL where am more confident in storms being
around. If a storm moves through then brief IFR/lower visby in
torrential rains and gusty to locally damaging gusts possible in
TSRA. Carried VCSH at the remaining interior terminals
including BOS, but excluding PVD. SW winds around 10 kts with
gusts around 20 kts.

Tonight...Moderate to high confidence.

Through about 04z, VFR with possible ongoing strong, locally
severe TSRA with best chance from ORH westward, but may extend
to BOS. VFR conditions to then develop for most, with IFR/LIFR
stratus/fog for the South Coast/Cape and Islands second half of
the night. SW winds 5-10 kt trend WSW late.

Friday...High confidence.

Improving conditions to VFR for all terminals. Potential for
afternoon TSRA into the evening exists but more limited
coverage if any develop at all.

KBOS Terminal...High confidence in TAF. Possible strong/severe
TSRA around/after 21z but conditional.

KBDL Terminal...High confidence in TAF. Better chance for
strong/severe TSRA after 21z, though the timing is still
subject to adjustment.

Outlook /Friday Night through Monday/...

Friday Night: Mainly VFR, with areas MVFR possible. Slight
chance SHRA, isolated TSRA.

Saturday: Mainly VFR, with areas MVFR possible. Chance SHRA,
slight chance TSRA.

Saturday Night: Mainly VFR, with local MVFR possible. Slight
chance SHRA, slight chance TSRA.

Sunday through Monday: VFR.

&&

.MARINE...
Forecaster Confidence Levels.

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

Today through Friday...High confidence in seas/winds, but low
confidence in shower/storm risk.

Tranquil boating conditions just focusing in on winds and seas.
Winds remaining out of the S and SW with speeds generally between 5-
15 kts. Could have some gusts up to 20 kts today. Seas of 2-4 feet
across the outer waters. Will have some ocean stratus/fog to deal
with early today and tonight into early Friday. Visibilities early
today range from 1/4 SM to 3 SM with the lowest across the southern
waters. Tonight into early Friday visibilities range from 1/2 SM to
3 SM.

Today and Friday will be dry for much of the day. There are shots
for some storms to cross into the waters late in the afternoon and
into evening. Not out of the question that some of these storms
bring gusty winds along with heavy downpours. Given the forcing is
quite weak confidence in how things evolve is low at this point in
time.

/Outlook /Friday Night through Monday/...

Friday: Winds less than 25 kt. Seas locally approaching 5 ft.

Friday Night: Winds less than 25 kt. Seas locally approaching
5 ft. Slight chance of rain showers, isolated thunderstorms.

Saturday through Saturday Night: Winds less than 25 kt. Chance
of rain showers, slight chance of thunderstorms.

Sunday through Monday: Winds less than 25 kt.

&&

.CLIMATE...
Record Daily High Temperatures for August 12-13

August 12

BOS 101 in 1944
BDL 98  in 1944
PVD 100 in 1944
ORH 99  in 1944

August 13

BOS 100 in 1944
BDL 99  in 2016
PVD 100 in 2005
ORH 98  in 1944

Record Daily Warmest Low Temperatures for August 12-13

August 12

BOS 78 in 2016
BDL 74 in 1905
PVD 76 in 1944
ORH 74 in 1896

August 13

BOS 75 in 1944
BDL 74 in 2005
PVD 77 in 2005
ORH 75 in 1896

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Air Quality Alert until 11 PM EDT this evening for CTZ002>004.
     Excessive Heat Warning until 8 PM EDT this evening for
     CTZ002>004.
     Excessive Heat Watch from 8 PM EDT this evening through Friday
     evening for CTZ002>004.
MA...Air Quality Alert until 11 PM EDT this evening for MAZ005-007-
     011>023.
     Excessive Heat Warning until 8 PM EDT this evening for
     MAZ003>007-010>019-026.
     Excessive Heat Watch from 8 PM EDT this evening through Friday
     evening for MAZ002>019-026.
     Heat Advisory until 8 PM EDT this evening for MAZ002-008-009-
     020-021.
RI...Air Quality Alert until 11 PM EDT this evening for RIZ001>008.
     Excessive Heat Warning until 8 PM EDT this evening for
     RIZ001>005.
     Excessive Heat Watch from 8 PM EDT this evening through Friday
     evening for RIZ001>005.
     Heat Advisory until 8 PM EDT this evening for RIZ006-007.
MARINE...None.

&&

SYNOPSIS...BL/Loconto
NEAR TERM...BL/Loconto/Gaucher
SHORT TERM...Loconto
LONG TERM...BL
AVIATION...BL/Loconto/Gaucher
MARINE...BL/Loconto
CLIMATE...

Hazardous Weather Outlook
National Weather Service Boston/Norton MA
433 AM EDT Thu Aug 12 2021

MAZ003>007-010>019-026-130845-
Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA-
Western Essex MA-Eastern Essex MA-Eastern Hampshire MA-
Eastern Hampden MA-Southern Worcester MA-Western Norfolk MA-
Southeast Middlesex MA-Suffolk MA-Eastern Norfolk MA-
Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-
Northern Middlesex MA-
433 AM EDT Thu Aug 12 2021

...EXCESSIVE HEAT WARNING IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS
EVENING...
...EXCESSIVE HEAT WATCH IN EFFECT FROM THIS EVENING THROUGH FRIDAY
EVENING...

This Hazardous Weather Outlook is for central Massachusetts,
eastern Massachusetts, northeastern Massachusetts, southeastern
Massachusetts and western Massachusetts.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Excessive Heat Warning.
   Excessive Heat Watch.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Excessive Heat Watch.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MAZ002-008-009-130845-
Western Franklin MA-Western Hampshire MA-Western Hampden MA-
433 AM EDT Thu Aug 12 2021

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS
EVENING...
...EXCESSIVE HEAT WATCH IN EFFECT FROM THIS EVENING THROUGH FRIDAY
EVENING...

This Hazardous Weather Outlook is for western Massachusetts.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Heat Advisory.
   Excessive Heat Watch.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Excessive Heat Watch.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

CTZ002>004-RIZ001>004-130845-
Hartford CT-Tolland CT-Windham CT-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-
433 AM EDT Thu Aug 12 2021

...AIR QUALITY ALERT IN EFFECT FROM 11 AM THIS MORNING TO 11 PM EDT
THIS EVENING...
...EXCESSIVE HEAT WARNING IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS
EVENING...
...EXCESSIVE HEAT WATCH IN EFFECT FROM THIS EVENING THROUGH FRIDAY
EVENING...

This Hazardous Weather Outlook is for northern Connecticut and
northern Rhode Island.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Air Quality Alert.
   Excessive Heat Warning.
   Excessive Heat Watch.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Excessive Heat Watch.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

RIZ005-130845-
Bristol RI-
433 AM EDT Thu Aug 12 2021

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING...
...AIR QUALITY ALERT IN EFFECT FROM 11 AM THIS MORNING TO 11 PM EDT
THIS EVENING...
...EXCESSIVE HEAT WARNING IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS
EVENING...
...EXCESSIVE HEAT WATCH IN EFFECT FROM THIS EVENING THROUGH FRIDAY
EVENING...

This Hazardous Weather Outlook is for northern Rhode Island.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Dense Fog Advisory.
   Air Quality Alert.
   Excessive Heat Warning.
   Excessive Heat Watch.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Excessive Heat Watch.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ230>237-250-251-254>256-130845-
Boston Harbor-Cape Cod Bay-Nantucket Sound-Vineyard Sound-
Buzzards Bay-Rhode Island Sound-Narragansett Bay-Block Island Sound-
Coastal waters east of Ipswich Bay and the Stellwagen Bank National
Marine Sanctuary-Massachusetts Bay and Ipswich Bay-
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-
Coastal Waters from Montauk NY to Marthas Vineyard extending out to
20 nm South of Block Island-
433 AM EDT Thu Aug 12 2021

This Hazardous Weather Outlook is for Massachusetts and Rhode
Island coastal waters.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

RIZ006-007-130845-
Washington RI-Newport RI-
433 AM EDT Thu Aug 12 2021

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING...
...AIR QUALITY ALERT IN EFFECT FROM 11 AM THIS MORNING TO 11 PM EDT
THIS EVENING...
...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for southern Rhode Island.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Dense Fog Advisory.
   Air Quality Alert.
   Heat Advisory.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MAZ022>024-130845-
Barnstable MA-Dukes MA-Nantucket MA-
433 AM EDT Thu Aug 12 2021

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING...

This Hazardous Weather Outlook is for southeastern Massachusetts.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Dense Fog Advisory.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MAZ020-021-130845-
Southern Bristol MA-Southern Plymouth MA-
433 AM EDT Thu Aug 12 2021

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING...
...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for southeastern Massachusetts.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Dense Fog Advisory.
   Heat Advisory.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

RIZ008-130845-
Block Island RI-
433 AM EDT Thu Aug 12 2021

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING...
...AIR QUALITY ALERT IN EFFECT FROM 11 AM THIS MORNING TO 11 PM EDT
THIS EVENING...

This Hazardous Weather Outlook is for southern Rhode Island.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Dense Fog Advisory.
   Air Quality Alert.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

For more information on upcoming hazardous weather, please see the
Area Forecast Discussion on our webpage for the latest forecast
thinking. There is also our Enhanced Hazardous Weather Outlook at
www.weather.gov/box/ehwo

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

Special Weather Statement
National Weather Service Boston/Norton MA
345 PM EDT Thu Aug 12 2021

MAZ002-003-008>011-122045-
Western Franklin MA-Western Hampshire MA-Western Hampden MA-
Eastern Hampden MA-Eastern Franklin MA-Eastern Hampshire MA-
345 PM EDT Thu Aug 12 2021

...Strong thunderstorms will impact portions of the Connecticut
River Valley after 430 PM...

At 345 PM EDT, Doppler radar was tracking strong to severe
thunderstorms along a line extending from near Bennington to about
20 miles west of Pittfield. Movement was east at 25 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Chicopee, Holyoke, Amherst, Northampton, Greenfield, Deerfield, South
Hadley, Easthampton, Monroe, Montague, Granby, Southampton, Hadley,
Sunderland, Hatfield, Northfield, Williamsburg, Huntington,
Bernardston and Buckland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms may intensify, so be certain to monitor media for
additional information and possible warnings from the National
Weather Service.

&&

LAT...LON 4238 7301 4239 7301 4263 7295 4266 7295
      4267 7300 4270 7295 4270 7302 4274 7302
      4272 7232 4218 7254 4228 7300 4231 7300
      4231 7303 4233 7306 4238 7307
TIME...MOT...LOC 1940Z 273DEG 23KT 4287 7314 4249 7365

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Nash