Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 66, NWS Boston/Norton, MA

August 2, 2017Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 2, 2017, 4:48 PM EDT for Worcester County, Massachusetts. It was in force for 31 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 2, 2017, 4:48 PM EDT (20:48 UTC)
Expired
Aug 2, 2017, 5:19 PM EDT
In force
31 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Worcester County, MA

The radar

The Boston radar (KBOX), 100 km from the middle of the area, began a volume at 20:48 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Aug 2, 5:12 PM EDTTSTM WND DMGPetersham, MATWO TREES DOWN ON ROUTE 32A

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 24 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 8.8 hours before the alert went out and 138 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Albany, NY at 12:00Z on 2017-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 312 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 12:00Z on 2017-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
312 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
1098 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

685 
WUUS51 KBOX 022048
SVRBOX
MAC027-022130-
/O.NEW.KBOX.SV.W.0066.170802T2048Z-170802T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
448 PM EDT WED AUG 2 2017

The National Weather Service in Taunton has issued a

* Severe Thunderstorm Warning for...
  West central Worcester County in central Massachusetts...

* Until 530 PM EDT

* At 447 PM EDT, a severe thunderstorm was located over Hardwick, or
  15 miles east of Amherst, and is nearly stationary.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is possible. Expect damage to 
           trees and power lines. 

* Locations impacted include...
  Gardner, Holden, Ware, Templeton, Rutland, Barre, Warren, North
  Brookfield, Hubbardston, West Brookfield, Princeton, Hardwick,
  Oakham, Phillipston, Petersham, New Braintree and New Salem.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4256 7201 4238 7185 4224 7222 4225 7221
      4231 7221 4230 7227 4235 7228 4235 7230
      4240 7232 4242 7231 4244 7229 4245 7229
TIME...MOT...LOC 2047Z 248DEG 3KT 4238 7221 

HAIL...1.00IN
WIND...60MPH
 
$$

Frank
1 follow-up statement
839 
WWUS51 KBOX 022119
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
519 PM EDT WED AUG 2 2017

MAC027-022129-
/O.CAN.KBOX.SV.W.0066.000000T0000Z-170802T2130Z/
Worcester MA-
519 PM EDT WED AUG 2 2017

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL WORCESTER COUNTY
IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

LAT...LON 4256 7201 4238 7185 4224 7222 4225 7221
      4231 7221 4230 7227 4235 7228 4235 7230
      4240 7232 4242 7231 4244 7229 4245 7229
TIME...MOT...LOC 2117Z 248DEG 3KT 4239 7218 

$$

Frank

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Boston/Norton, MA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 2, 3:53 PM EDT, 55 minutes earlier.

Area forecast discussion, Aug 2, 3:53 PM EDT, 55 minutes before
Area Forecast Discussion
National Weather Service Taunton MA
353 PM EDT Wed Aug 2 2017

.SYNOPSIS...
Scattered afternoon showers and thunderstorms are expected today
containing threats of heavy rain, gusty winds, and hail up to an
inch. Flash flooding is possible with heavy rain and slow moving
storms. A FLASH FLOOD WATCH is in effect. Scattered shower and
thunderstorm activity continues through the week. A cold front
will cross the region Saturday that may bring another round of
scattered showers and thunderstorms. A few strong storms are
possible. Behind the front, expect splendid late summer
conditions on Sunday with low humidity. Unsettled weather may
return early next week in the form of more scattered showers and
thunderstorms.

&&

.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
330 pm update...

*/ Highlights...

 - FLASH FLOOD WATCH in effect for areas N/W of Providence RI to
   Plymouth MA, roughly Route 44.

 - Slow moving thunderstorms presently ongoing, embedded heavy
   rain threats with rainfall rates of around 2-3 inches an hour

 - Main threat of heavy rain and localized flooding with
   expected slow storm movement.

 - Additional threats of gusty winds and hail up to an inch with
   any of the stronger storms.

*/ Discussion...

Storms impacting S New England. Numerous observations of rainfall
rates of around 2-3 inches an hour contributing to flash flooding
as storm movement has been nearly stationary, in some instances
back-building given the marginal shear environment supporting
multi-cellular storms with cold pool outflows. With higher lofted
cores, more likely impacts of large hail up to an inch and wind
gusts to 50 mph. These threats are likely to continue into the
evening hours by which point they are expected to dissipate with
the lack of daytime heating.

To reiterate...

Main threat will be heavy rain and localized flooding given the
very moist environment and slow movement of storms, as well as
the convective nature of the environment to be pulse- to multi-
cellular convection. Rainfall rates around 2-3 inches per hour
over one particular area, which has already been observed in
spots, contributing to flash flooding.

Secondary threats of hail up to an inch and damaging wind threats
with any cores that are able to be lofted high that immediately
come down.

Given wind and shear profiles, storm-associated cold pools are not
maintaining with some of the storms. Getting a lot of boundary
collisions across S New England, the confluence of which is
contributing to storm maintenance or initiation. This in addition
to daytime mixing. As has been stated earlier, as the energy within
the boundary layer becomes exhausted and the sun goes down, should
see convective activity dissipate.

Tonight...

Convection dissipating into evening, low clouds fill in overnight.
Anticipating with partial clearing after the storms and continued
light wind profile with abundant low-level moisture, that as a
result of nocturnal cooling, low clouds and fog should develop.
Higher confidence for those areas with higher dewpoints across
the interior, specifically the lower CT-River Valley and SE New
England. This as low drop down into the mid to upper 60s.

&&

.SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/...
Thursday...

Scattered showers and thunderstorms mainly over N/W MA and CT.
Low clouds and fog dissipating during the morning hours with the
early-August sun. Anticipating the burn-off towards the SE coast,
low clouds lingering the longest in and around the Newport RI to
New Bedford MA region. Heights rising within the mid-upper levels
out ahead of a stronger vortmax in associated with deeper mid-
level troughing across the Great Lakes Region. A bit more of a
cap across the region, limiting shower and thunderstorm activity,
however given the moist, unstable environment still in place,
some activity is expected, the area of greatest threat to the
N/W away from the more onshore, stable marine air, mainly atop
the high terrain with anabatic, convergent flow up the slopes.
Heavy rain the main threat given the weak shear and mean wind
profile. Storms likely once again to be the pulse-type and slow
moving given the weak steering flow.

Thursday night...

Convection dissipating again, expect the return of low clouds and
fog. Clearing into the evening, anticipating that all the low clouds
along the S-shore dissipated or become scattered, given the low
level moist profile and nocturnal cooling, low clouds and fog develop
once again. Higher dewpoint air over much of the region, feel there
is a risk of low clouds and fog over a majority of S New England.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...

Highlights...

* Typical summer warmth and humidity Friday and Saturday
* Scattered afternoon and evening showers/thunderstorms Friday
* Another round of showers/thunderstorms with a cold front during
  Saturday, a few may be strong
* Heat and humidity break Sat night into early next week

Overview...

Main H5 steering pattern across continues to signal an eastern
Pacific/Alaska high amplitude ridge with responding downstream
trough from broad cutoff H5 low across Hudson/James Bays through
Ontario to the mid Mississippi valley. Will start off with S-SW
winds and warm, humid conditions. With cold front well W of the
region, may see diurnal showers/thunderstorms during Fri across
central and western areas. The upper pattern remains relatively
progressive, so models continue to signal cold front moving
steadily E during Sat, but appears most of the energy will
remain N of the region as the short wave swings NE across
upstate NY into Quebec.

As the short wave lifts out of the region late this weekend,
generally a mainly zonal flow will bring dry and briefly cool
conditions. Another short wave may push E-NE across the Great
Lakes early next week. A weak surface reflection may push E, but
timing and track are in question due to wide model solution
spread. Overall, however, pattern looks to remain progressive
through the middle of next week.

Details...

Friday...
With broad, diffluent SW flow aloft, the cold front should
remain well W of the region closer to the mid level trough. Also
noting low pressure off the mid Atlantic coast which should
slowly pass well SE of the region. With general instability
across the region, expect scattered afternoon/evening showers
and thunderstorms to develop. PWATs generally 1.5 to 1.7 inches,
so may see some locally heavy downpours. Scattered showers may
linger Fri night across central and western areas ahead of
approaching front.

SW winds gusting up to around 20-25 mph along the S coast. Away
from the S coast, temps will top off in the lower-mid 80s.

Saturday-Saturday night...
Cold front steadily pushes E during this timeframe. Best shot
for showers/thunderstorms will occur during the day Sat,
especially across western areas where likely POPs remain in
place, with scattered activity further E. Good instability
noted, with SLIs from zero to -2 and K indices in the lower 30s.
Also noting PWATs in the 1.7 to 1.8 inch range across western
areas, so may see spotty heavy downpours during the day.

Back edge of precip should push E starting Sat evening across
the CT valley, with a few lingering thunderstorms through around
midnight across the E. Expect improving conditions after 06Z-
08Z across E Mass/RI as drier air works in.

Sunday-Monday...
Cold front well offshore by Sunday morning, then broad high
pressure works in. This will be cooler conditions especially
across the interior. H85 temps will be down to +10C to +12C
Sunday morning, coolest across the E slopes of the Berkshires
where high temps will only reach to around 70 (about 10 degrees
below normal). Temps will range to 75-80 across the coastal
plain.

On Monday, the high will shift offshore in fast nearly
progressive mid level flow. Some question on timing of next
approaching low, with leading edge may push into western areas
Mon night.

Tuesday-Wednesday...
Low confidence for Tuesday as low pressure may pass across the
region. Carrying chance POPs for now with timing and exact track
issues in place. Low may push offshore by Tue night, then
another high may approach Wed. For now, have continued with
below normal temps both Tue and Wed.

&&

.AVIATION /20Z WEDNESDAY THROUGH MONDAY/...
Forecaster Confidence Levels...

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

Short Term /through Thursday Night/...

Rest of today...
SCT SHRA/TSRA ongoing N/W of PVD-GHG, will continue into evening.
A FLASH FLOOD WATCH is in effect. +RA definite along with MVFR-
IFR impacts. Also expecting gusty winds radiating outwards from
storm centers. Continue TEMPO wording VRB15G25KT. Stronger storms
will also contain a risk of hail. Otherwise, breezy S winds with
possible gusts near 20 kts for SE coastal terminals.

Wednesday night...Moderate confidence.
SHRA/TSRA dissipate after sunset. VFR mostly however expect IFR-
LIFR CIGs and VSBYs to develop once again. Higher confidence for
the lower CT-River Valley and interior SE New England terminals.
Light S winds overall.

Thursday...Moderate confidence.
IFR-LIFR CIGs and VSBYs erode towards the S-coast, lingering
possibly into the midday hours for places like UUU-EWB. SCT
SHRA/TSRA develop over the N/W interior, mainly across the high
terrain. TEMPO MVFR-IFR with any wet-weather. Otherwise VFR with
breezy S winds, gusts up to 20 kts.

Thursday night...Moderate confidence.
SCT SHRA/TSRA dissipate into evening. VFR initially again but
expect IFR-LIFR CIGs and VSBYs to develop, more widespread over
S New England terminals into Friday morning. Light S winds.

KBOS Terminal...TSRA impacting the terminal, winds are VRB at this
time. Should see as activity dissipates into evening that winds
return more S. For now, present activity will result in MVFR-IFR
impacts and the continuation of airport weather warnings.

KBDL Terminal...TSRA impacting the terminal, winds are VRB at this
time. Should see as activity dissipates into evening that winds
return more S. For now, present activity will result in MVFR-IFR
impacts and the continuation of airport weather warnings.

Outlook /Friday through Monday/...

Friday...High confidence.
Mainly VFR. May see sct SHRA/TSRA across N central and western
areas Fri afternoon/evening, then taper back to SHRA across the
CT valley Fri night. Patchy late night/early morning fog with
local MVFR-IFR VSBYS.

Saturday...Moderate to high confidence.
Sct-numerous showers/sct TSRA with local MVFR-IFR conditions.
Some +SHRA possible over central and western areas through early
afternoon. Leftover patchy early morning fog. Light S-SW winds
shift to W across central and western areas Sat afternoon.

Saturday night-Sunday...Moderate confidence.
Leftover SHRA/TSRA over central and eastern areas Sat evening,
should push offshore by 04Z-05Z. Otherwise, VFR conditions. W-NW
winds 5-10 kt.

Sunday-Monday...Moderate confidence.
VFR conditions Sunday. Scattered showers move from W-E during
Monday, but timing in question. Local MVFR CIGS/VSBYS.

&&

.MARINE...
FORECASTER CONFIDENCE LEVELS...

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

Short Term /through Thursday Night/...High confidence.

Small boats along the S waters should tread cautiously for the
next few days as likely with daytime mixing and subsequent sea-
breezes, winds especially within bays and sounds will likely
gust 15 to 20 knots with sustained winds around 10 to 15 kts.
Seas remaining below 4 feet but expect 2 foot seas within the
inner harbors and bays.

Into this evening...

Adverse weather is expected off the coast N of Quincy. Mariners
should be aware of anticipated scattered shower and thunderstorm
activity developing W and slowly moving N/E along the near-shore.
Gusty winds can be expected along with heavy rain and frequent
lightning. Small boats at the greatest risk of impact.

Tonight...

Storms dissipated. Some low clouds and fog conditions are
possible along the near-shore waters. Otherwise light S winds.

Thursday into Thursday night...

Breezy S winds up to 20 kts during the day. The return of low
clouds and fog along the near-shore possible overnight.

Outlook /Friday through Monday/...High confidence.

Friday...High confidence.
May see S-SW wind gusts up to 25 kt and seas to 4 ft east of
the Merrimack River Fri afternoon/evening. Otherwise expect
winds and seas below small craft criteria. Locally reduced
visibilities in patchy late night fog.

Saturday...Moderate confidence.
S-SW winds will shift to W-NW Sat night. Gusts up to around 20
kt. Scattered showers/isolated thunderstorms possible Sat
afternoon/evening. Conditions should improve around or after
midnight. Locally reduced visibilities in patchy late night fog.

Sunday-Monday...Moderate to high confidence.
Dry conditions Sunday. Light W-NW winds. Remaining dry Monday
morning through midday, then scattered showers move across from
W-E through Monday night. Local visibility restrictions in
showers and patchy fog.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Flash Flood Watch until 8 PM EDT this evening for CTZ002>004.
MA...Flash Flood Watch until 8 PM EDT this evening for MAZ002>016-
     026.
RI...Flash Flood Watch until 8 PM EDT this evening for RIZ001.
MARINE...None.

&&

SYNOPSIS...Sipprell/EVT
NEAR TERM...Sipprell
SHORT TERM...Sipprell
LONG TERM...EVT
AVIATION...Sipprell/EVT
MARINE...Sipprell/EVT
Hazardous weather outlook, Aug 2, 12:11 PM EDT, 4 hours 37 minutes before
Hazardous Weather Outlook
National Weather Service Taunton MA
1211 PM EDT Wed Aug 2 2017

CTZ002>004-MAZ002>016-026-RIZ001-031615-
Hartford CT-Tolland CT-Windham CT-Western Franklin MA-
Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA-
Western Essex MA-Eastern Essex MA-Western Hampshire MA-
Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA-
Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA-
Suffolk MA-Eastern Norfolk MA-Northern Middlesex MA-
Northwest Providence RI-
1211 PM EDT Wed Aug 2 2017

...FLASH FLOOD WATCH IN EFFECT UNTIL 8 PM EDT THIS EVENING...

This Hazardous Weather Outlook is for northern Connecticut, central
Massachusetts, eastern Massachusetts, northeastern Massachusetts,
western Massachusetts and northern Rhode Island.

.DAY ONE...This Afternoon and Tonight.

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

   Flash Flood Watch.

Scattered thunderstorms are expected this afternoon into the
evening, primarily along and northwest of a Boston to Providence
line. Any thunderstorm that develops will be slow moving and capable
of resulting in a very localized heavy rain/street-highway flooding.
While the overall severe weather threat is low, an isolated strong
thunderstorm or two with localized gusty winds and small hail is
possible.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is likely this afternoon.

MAZ017>019-RIZ002>004-031615-
Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-
1211 PM EDT Wed Aug 2 2017

This Hazardous Weather Outlook is for southeastern Massachusetts
and northern Rhode Island.

.DAY ONE...This Afternoon and Tonight.

Scattered thunderstorms are expected this afternoon into the
evening, primarily along and northwest of a Boston to Providence
line. Any thunderstorm that develops will be slow moving and capable
of resulting in a very localized heavy rain/street-highway flooding.
While the overall severe weather threat is low, an isolated strong
thunderstorm or two with localized gusty winds and small hail is
possible.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible later this afternoon.

ANZ230-250-251-031615-
Boston Harbor-
Coastal waters east of Ipswich Bay and the Stellwagen Bank National
Marine Sanctuary-Massachusetts Bay and Ipswich Bay-
1211 PM EDT Wed Aug 2 2017

This Hazardous Weather Outlook is for Massachusetts coastal waters.

.DAY ONE...This Afternoon and Tonight.

There is a low risk for a strong thunderstorm or two with gusty
winds, small hail and very heavy rainfall along the waters adjacent
to the northeast MA coast.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MAZ020>024-RIZ005>008-031615-
Southern Bristol MA-Southern Plymouth MA-Barnstable MA-Dukes MA-
Nantucket MA-Bristol RI-Washington RI-Newport RI-Block Island RI-
1211 PM EDT Wed Aug 2 2017

This Hazardous Weather Outlook is for southeastern Massachusetts,
northern Rhode Island and southern Rhode Island.

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ231>237-254>256-031615-
Cape Cod Bay-Nantucket Sound-Vineyard Sound-Buzzards Bay-
Rhode Island Sound-Narragansett Bay-Block Island Sound-
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-
1211 PM EDT Wed Aug 2 2017

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

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

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

In the hours before

Special weather statement, Aug 2, 3:44 PM EDT, 1 hour 4 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Taunton MA
344 PM EDT WED AUG 2 2017

MAZ004-026-022030-
Northwest Middlesex County MA-Northern Worcester MA-
344 PM EDT WED AUG 2 2017

...Strong Thunderstorm in north central Worcester and northwestern
Middlesex Counties...

At 344 PM EDT, Doppler radar was tracking a strong thunderstorm over
Shirley, or near Leominster, moving east at 10 mph.

Dime size hail and winds in excess of 30 mph will accompany this
storm.

Locations impacted include...
Leominster, Fitchburg, Pepperell, Groton, Lunenburg, Townsend,
Lancaster, Hollis, Ayer, Shirley, Ashburnham, Ashby and Brookline.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

Do not drive through flooded roads or underpasses. Avoid low lying
areas near small streams.

&&

LAT...LON 4270 7155 4268 7156 4267 7154 4265 7154
      4264 7150 4263 7149 4251 7171 4251 7178
      4259 7177 4260 7185 4264 7187 4271 7165
      4271 7161
TIME...MOT...LOC 1944Z 249DEG 8KT 4258 7168

Frank
Special weather statement, Aug 2, 3:54 PM EDT, 54 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Taunton MA
354 PM EDT WED AUG 2 2017

MAZ016-019-022045-
Eastern Plymouth MA-Eastern Norfolk MA-
354 PM EDT WED AUG 2 2017

...Strong Thunderstorm in northeastern Norfolk and north central
Plymouth Counties...

At 354 PM EDT, Doppler radar was tracking a strong thunderstorm over
Braintree, moving east at 10 mph.

Dime size hail and winds in excess of 30 mph will accompany this
storm.

Locations impacted include...
Boston, Quincy, Weymouth, Braintree, Randolph, Milton, Hingham,
Scituate, Holbrook, Norwell, Hull and Cohasset.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

&&

LAT...LON 4234 7087 4232 7087 4227 7080 4227 7077
      4221 7069 4220 7070 4216 7098 4217 7098
      4217 7102 4219 7102 4220 7107 4224 7109
      4234 7095 4235 7088
TIME...MOT...LOC 1954Z 249DEG 7KT 4221 7100

Frank
Special weather statement, Aug 2, 4:11 PM EDT, 37 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Taunton MA
411 PM EDT WED AUG 2 2017

MAZ016-019-022100-
Eastern Plymouth MA-Eastern Norfolk MA-
411 PM EDT WED AUG 2 2017

...Strong Thunderstorm in northeastern Norfolk and north central
Plymouth Counties...

At 411 PM EDT, Doppler radar was tracking a strong thunderstorm over
Quincy. This storm was nearly stationary.

Pea size hail and winds in excess of 40 mph will accompany this
storm.

Locations impacted include...
Boston, Quincy, Weymouth, Braintree, Milton, Hingham, Scituate, Hull
and Cohasset.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive through flooded roads or underpasses. Avoid low lying
areas near small streams.

&&

LAT...LON 4234 7087 4232 7087 4227 7080 4227 7079
      4224 7076 4219 7103 4225 7107 4233 7095
      4235 7091 4235 7088
TIME...MOT...LOC 2011Z 236DEG 4KT 4223 7102

Frank
Local storm report, Aug 2, 4:18 PM EDT, 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TAUNTON MA
418 PM EDT WED AUG 02 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0305 PM     TSTM WND DMG     BOLTON                  42.43N  71.60W
08/02/2017                   WORCESTER          MA   PUBLIC

            TREE DOWN AND LARGE BRANCHES DOWN ON TEELLE ROAD

&&

AED
Special weather statement, Aug 2, 4:27 PM EDT, 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Taunton MA
427 PM EDT WED AUG 2 2017

MAZ004-026-022115-
Northwest Middlesex County MA-Northern Worcester MA-
427 PM EDT WED AUG 2 2017

...Strong Thunderstorms Developing in north central Worcester and
northwestern Middlesex Counties COUNTIES...

At 427 PM EDT, Doppler radar was tracking a strong thunderstorm over
Fitchburg, moving east at 15 mph.

Pea size hail and winds in excess of 30 mph will accompany this
storm.

Locations impacted include...
Leominster, Fitchburg, Pepperell, Groton, Lunenburg, Townsend,
Hollis, Ayer, Westminster, Shirley, Ashburnham, Ashby, Mason and
Brookline.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

&&

LAT...LON 4271 7161 4257 7158 4253 7188 4263 7195
      4271 7182
TIME...MOT...LOC 2027Z 248DEG 12KT 4261 7179

Frank
Special weather statement, Aug 2, 4:43 PM EDT, 5 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Taunton MA
443 PM EDT WED AUG 2 2017

MAZ014>016-019-022115-
Eastern Plymouth MA-Suffolk MA-Eastern Norfolk MA-
Southeast Middlesex MA-
443 PM EDT WED AUG 2 2017

...Strong Thunderstorms Developing in northeastern Norfolk...central
Suffolk...southeastern Middlesex and north central Plymouth Counties
COUNTIES...

At 443 PM EDT, Doppler radar was tracking a strong thunderstorm over
Brookline. This storm was nearly stationary.

Pea size hail and winds in excess of 30 mph will accompany this
storm.

Locations impacted include...
Boston, Cambridge, Quincy, Somerville, Brookline, Weymouth, Revere,
Everett, Braintree, Chelsea, Watertown, Milton, Hingham, Scituate,
Winthrop, Rockland, Norwell, Hull, Cohasset and Nahant.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

&&

LAT...LON 4242 7089 4241 7090 4241 7095 4235 7093
      4235 7087 4232 7087 4227 7080 4227 7076
      4221 7070 4216 7092 4237 7118 4243 7090
TIME...MOT...LOC 2043Z 248DEG 4KT 4233 7109

Frank

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 2, 11:55 AM EDTFlash Flood WatchBOXEssex, Franklin, Hampden, Hampshire, Middlesex, Norfolk and 2 more8 hr
Aug 2, 1:00 PM EDTSpecial Weather StatementBOXWorcester30 min
Aug 2, 2:00 PM EDTSpecial Weather StatementBOXNorfolk45 min
Aug 2, 2:05 PM EDTFlash Flood WarningBOXNorfolk3 hr
Aug 2, 2:12 PM EDTSpecial Weather StatementBOXHampshire33 min
Aug 2, 2:13 PM EDTFlash Flood WarningBOXFranklin, Hampshire3 hr
Aug 2, 2:16 PM EDTSpecial Weather StatementBOXSuffolk29 min
Aug 2, 2:21 PM EDTSpecial Marine WarningBOX39 min
Aug 2, 2:22 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire38 min
Aug 2, 2:24 PM EDTFlash Flood WarningBOXHampden, Hampshire3 hr
Aug 2, 2:26 PM EDTSevere Thunderstorm WarningBOXSuffolk34 min
Aug 2, 2:29 PM EDTFlash Flood WarningBOXSuffolk3 hr
Aug 2, 2:34 PM EDTSpecial Weather StatementBOXEssex, Middlesex41 min
Aug 2, 2:37 PM EDTSpecial Weather StatementBOXPlymouth38 min
Aug 2, 2:42 PM EDTFlash Flood WarningBOXMiddlesex3 hr
Aug 2, 2:46 PM EDTSpecial Marine WarningBOX59 min
Aug 2, 2:50 PM EDTSpecial Marine WarningBOX40 min
Aug 2, 2:52 PM EDTSevere Thunderstorm WarningBOXMiddlesex38 min
Aug 2, 2:57 PM EDTSpecial Weather StatementBOXEssex48 min
Aug 2, 3:01 PM EDTSpecial Weather StatementBOXWorcester44 min
Aug 2, 3:02 PM EDTSpecial Weather StatementBOXHampden43 min
Aug 2, 3:10 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire50 min
Aug 2, 3:13 PM EDTSpecial Weather StatementBOXEssex47 min
Aug 2, 3:29 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester32 min
Aug 2, 3:33 PM EDTSevere Thunderstorm WarningBOXMiddlesex29 min
Aug 2, 3:44 PM EDTSpecial Weather StatementBOXMiddlesex46 min
Aug 2, 3:50 PM EDTSpecial Marine WarningBOX55 min
Aug 2, 3:54 PM EDTSpecial Weather StatementBOXSuffolk51 min
Aug 2, 4:00 PM EDTSevere Thunderstorm WarningBOXWorcester45 min
Aug 2, 4:08 PM EDTFlash Flood WarningBOXMiddlesex, Worcester3 hr
Aug 2, 4:11 PM EDTSpecial Weather StatementBOXSuffolk49 min
Aug 2, 4:42 PM EDTSpecial Marine WarningBOX63 min
Aug 2, 4:43 PM EDTSpecial Weather StatementBOXSuffolk32 min
Aug 2, 4:56 PM EDTAreal Flood WarningBOXPlymouth2 hr
Aug 2, 5:04 PM EDTSpecial Weather StatementBOXSuffolk41 min
Aug 2, 5:09 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Norfolk, Worcester38 min
Aug 2, 5:17 PM EDTFlash Flood WarningBOXMiddlesex, Norfolk, Worcester118 min
Aug 2, 5:26 PM EDTFlash Flood WarningBOXSuffolk2 hr
Aug 2, 5:43 PM EDTSpecial Marine WarningBOX62 min
Aug 2, 6:15 PM EDTSpecial Weather StatementBOXNorfolk45 min
Aug 2, 6:36 PM EDTSpecial Weather StatementBOXNorfolk39 min
Aug 2, 6:44 PM EDTFlash Flood WarningBOXNorfolk, Suffolk2 hr

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2017Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.