Oppressive heat and humidity, along with increasing wind shear from an approaching mid level short wave, led to scattered severe thunderstorms in Massachusetts and northern Connecticut during the late afternoon and evening.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS BOX wrote it up.
Oppressive heat and humidity, along with increasing wind shear from an approaching mid level short wave, led to scattered severe thunderstorms in Massachusetts and northern Connecticut during the late afternoon and evening.
The local office's own words before the first event, 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 the first event at Jun 30, 3:28 PM EST, 2 hours 59 minutes earlier.
Area Forecast Discussion
National Weather Service Boston/Norton MA
428 PM EDT Wed Jun 30 2021
.SYNOPSIS...
Scattered to numerous showers and thunderstorms this evening, with
some strong to severe storms likely especially in northern MA. The
heat wave breaks Thursday, but oppressive humidity continues along
with more showers and thunderstorms with locally heavy rainfall
possible. The weather pattern remains unsettled on Friday into the
Fourth of July holiday weekend with the threat of showers continuing
and temperatures trending much cooler than normal.
&&
.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
Highlights
* Severe Thunderstorm Watch for much of southern New England until
10 PM.
* Expect showers and thunderstorms to continue into the evening.
Should see a downward trend due to the loss of daytime heating.
Trough digs into eastern Ontario/western Quebec by late tonight with
a weak shortwave lifting through southern New England. A prefrontal
trough will slide through bringing showers and thunderstorms.
Main concern in the immediate near term is the severe thunderstorm
risk for much of southern New England into the evening. Environment
parameters show surface based CAPEs of 2000-4000 J/kg per SPC
mesoanalysis with effective shear of 30-45 kts. The highest shear is
located across the interior, which is where we are thinking there is
the highest risk of severe weather. If cells stay discrete could
have a few supercells and a higher risk of large hail. Mid level
lapse rates remain poor, but this should be overcome by the nearly
adiabatic low level lapse rates and high instability. As CAMs
suggest should have things congeal more into a line and become more
of a wind threat as highlighted by SPCs outlook. DCAPE values range
from about 800-1000+ so damaging winds will be a risk. On top of
this should have heavy downpours with PWATs of 1.75-2 inches with
warm cloud layer depths between 3.5-4.5 km. Luckily, storms will be
moving, but given the airmass if these move over an urban area
cannot rule out localized flash flooding.
Expect the activity to diminish as we progress into the evening and
lose daytime heating. SPC Mesoanalysis shows CIN increase from south
to north, so am somewhat uncertain how stuff will hold together.
Have thrown out the HRRR guidance today as it has continually
diminished stuff far too quickly given the environment in place.
Will stay cloudy and expect a lull for a bit in precipitation late
tonight, but will have showers linger. Still expecting another mild
night across the region with the frontal boundary not through the
region. Low temperatures in the upper 60s to low 70s for much of the
region.
&&
.SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/...
Highlights
* Unsettled with scattered to numerous showers and a few
thunderstorms. Rainfall may be heavy at times and could result in
some flash flooding Thursday and Thursday night.
Trough over eastern Ontario/western Quebec will dig into the
central/eastern Great Lakes by early Friday. A cold front will
slowly slide southeastward into southern New England. Could see a
surface low ride along the frontal boundary late on Thursday into
early Friday.
Have two main concerns during this timeframe. The first is a heavy
rainfall threat that could lead to some flash flooding. The other is
that there is a risk for a few strong to severe thunderstorms
provided we can get the instability. First, for the heavy rain
threat expect fairly widespread showers with embedded thunderstorms
across southern New England on Thursday into Thursday night. Have
fairly high PWAT values across much of southern New England on
Thursday, between 1.5 to 2 inches and similar values Thursday night.
Should see the highest PWATs located from CT through RI into eastern
MA. This is also where there are warm cloud layer depths of 3-4 km.
If there are any leftover boundaries from storms yesterday then
there will be a higher risk for heavy downpours, which could lead to
localized flooding. Right now thinking the risk is highest where the
PWATs are the highest. Went with a combination of the 75th
percentile of guidance, WPC and NERFC for QPF Thursday through
Thursday night.
As for the severe weather risk on Thursday will have plenty of deep
layer shear available for organized convection with 40-50 kts of 0-6
km shear. There will be plenty of moisture available with the PWATs
mentioned above and dew points in the mid to upper 60s. The
uncertainty lies with the amount of instability available due to
cloud cover in place. Models showing a few hundred to 1000 J/kg of
MUCAPE, so cannot completely rule out a severe storm or two. Right
now per the latest HREF think this would be for CT to SE MA where 0-
3 km SRH is between 100-200 along with some areas with 2-5 km UH AOA
75.
Given the cloud cover in place will be cooler, but still humid given
the frontal boundary has not moved through. Aloft 925 hPa
temperatures will be between 15 to 20 degrees Celsius. The result
are highs ranging from the mid 70s to the mid 80s. Low temperatures
Thursday night fall into the 60s.
&&
.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
Highlights...
* Significant pattern change Friday & Saturday with much cooler
temps especially Sat along with scattered showers
* Improving trends Sunday and especially Mon with drier weather and
warming into the 70s Sun and 80s Mon
* Warm to hot weather Tue and Wed with highs 85-90
Friday...
Mid level trough axis still west of New England, yielding cyclonic
flow across MA/RI/CT. While main surface low exits Cape Cod early
Fri, mid level lift induces a broad area of low pressure over SNE.
This combined with deep layer moisture, especially over RI and
eastern MA, will support scattered showers thru the day. Noticeably
cooler with highs only 70-75 due to cloud cover and showers. Still
somewhat humid across CT/RI and southeast MA with dew pts in the
60s, upper 50s across northern MA.
Saturday...
Core of cooler air descends over SNE Sat as mid/upper trough rotates
across New England. This drives the frontal boundary offshore and
surface wave on the boundary enhancing NE flow into SNE. Thus highs
Sat only 65-70, 10-15 degs cooler than normal! Not a washout but
scattered showers likely.
Sunday...
Our transition day as mean mid level trough axis begins to exit
offshore. Thus a drying trend and not as cool with highs in the 70s.
Winds generally light and variable.
Monday...
Big improvement with rising heights and NW flow aloft, supporting
much warmer temps with highs in the 80s and dry weather.
Tuesday/Wednesday...
Warmer with highs 85-90. Possibly not as hot Wed pending timing of
next FROPA. Chance of convection with this feature both days given
uncertainty on timing of FROPA.
&&
.AVIATION /21Z WEDNESDAY THROUGH MONDAY/...
Forecaster Confidence Levels.
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Today...High confidence in trends, but moderate in timing.
VFR with scattered showers and storms developing between 19-22Z.
If a thunderstorm moves over a terminal expect conditions to
lower to MVFR/IFR with potential for gusts over 50 kts in
stronger storms. SW to W winds at 10-15 kts with gusts of 20-25
kts.
Tonight...Moderate confidence.
Showers continue with thunderstorm activity diminishing as it
moves toward the south coast during the evening. Anticipate a
lull in precipitation overnight, but will see more showers
spreading in toward daybreak/Thursday AM. Stratus and fog
developing over Cape/Islands and south coast with IFR to VLIFR
conditions. Expect the lowest over the Islands.
Thursday...Moderate confidence.
VFR with scattered to numerous showers and perhaps a few
thunderstorms. Anticipate the stratus/fog along the south coast
to lift. Ceilings will generally range from 4-6 kft. W winds
shifting to the S/SW around 5 kts.
Thursday night...Moderate confidence.
Scattered showers with some isolated thunderstorm activity
especially during the evening. Rainfall may be heavy at times.
Conditions deteriorating to MVFR/IFR with patchy fog. Light
southerly winds shifting to the E/NE late.
KBOS TAF...High Confidence in TAF. Strong to severe storms
possible Wed 21Z-23Z.
KBDL TAF...High Confidence in TAF. Strong to severe storms
possible Wed 20Z-23Z.
Outlook /Friday through Monday/...
Friday: Mainly IFR, with areas MVFR possible. Breezy. SHRA
likely, patchy BR.
Friday Night: MVFR/IFR conditions possible. Breezy. Chance
SHRA, patchy BR.
Saturday: Mainly MVFR, with areas IFR possible. Breezy. Chance
SHRA.
Saturday Night: Mainly MVFR, with local IFR possible. Chance
SHRA.
Independence Day: Mainly MVFR, with areas VFR possible. Chance
SHRA.
Sunday Night through Monday: Mainly VFR, with areas MVFR
possible. Slight chance SHRA.
&&
.MARINE...
Forecaster Confidence Levels.
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Thursday...High confidence
Persistent S to SW winds 10-20 kt. Diminishing SW winds Thu
with winds turning onshore over nearshore waters Thu afternoon
as local sea breezes develop.
Cannot rule out a few scattered strong t-storms developing near
the NE MA waters this evening and weakening showers and perhaps
a thunderstorm over south coastal waters late this evening.
More showers and t-storms develop on Thursday and continue into
Thursday night. Winds out of the SW across the southern waters
at 10-15 kts, but shift to the E/NE at 10-15 kts Thursday night.
Outlook /Friday through Monday/...
Friday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Chance of rain showers, patchy fog. Local visibility 1 to 3 nm.
Friday Night through Saturday Night: Winds less than 25 kt.
Areas of seas approaching 5 ft. Chance of rain showers.
Independence Day: Winds less than 25 kt. Seas up to 5 ft.
Slight chance of rain showers.
Sunday Night: Winds less than 25 kt. Areas of seas approaching
5 ft. Slight chance of rain showers.
Monday: Winds less than 25 kt. Areas of seas approaching 5 ft.
&&
.CLIMATE...
Jun 30 daily record highs...
BOS 95F (1945)
BDL 100F (1964)
PVD 98F (1945)
ORH 92F (1971)
Record High Min Temperatures
June 30
BOS 78F (1872)
BDL 72F (1948)
PVD 74F (1945)
ORH 72F (1901)
Highest Daily Dew Points
June 30
BOS 77F (1945)
BDL 77F (1959)
PVD 77F (1945)
ORH 71F (1999)
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Air Quality Alert until 11 PM EDT this evening for CTZ003-004.
Heat Advisory until 7 PM EDT this evening for CTZ002>004.
MA...Air Quality Alert until 11 PM EDT this evening for MAZ012>019.
Heat Advisory until 7 PM EDT this evening for MAZ003>007-
010>021-026.
RI...Air Quality Alert until 11 PM EDT this evening for RIZ001>008.
Heat Advisory until 7 PM EDT this evening for RIZ001>007.
MARINE...Small Craft Advisory until 8 PM EDT this evening for
ANZ231>235-237.
&&
SYNOPSIS...Nocera/BL
NEAR TERM...BL
SHORT TERM...BL
LONG TERM...Nocera
AVIATION...Nocera/BL
MARINE...Nocera/BL
CLIMATE...Hazardous Weather Outlook National Weather Service Boston/Norton MA 434 PM EDT Wed Jun 30 2021 RIZ003>007-012045- Western Kent RI-Eastern Kent RI-Bristol RI-Washington RI-Newport RI- 434 PM EDT Wed Jun 30 2021 ...AIR QUALITY ALERT IN EFFECT UNTIL 11 PM EDT THIS EVENING... ...HEAT ADVISORY IN EFFECT UNTIL 7 PM EDT THIS EVENING... This Hazardous Weather Outlook is for northern Rhode Island and southern Rhode Island. .DAY ONE...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. Heat Advisory. .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. MAZ022>024-012045- Barnstable MA-Dukes MA-Nantucket MA- 434 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for southeastern Massachusetts. .DAY ONE...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. CTZ002-MAZ003>007-010-011-020-021-026-012045- Hartford CT-Eastern Franklin MA-Northern Worcester MA- Central Middlesex MA-Western Essex MA-Eastern Essex MA- Eastern Hampshire MA-Eastern Hampden MA-Southern Bristol MA- Southern Plymouth MA-Northern Middlesex MA- 434 PM EDT Wed Jun 30 2021 ...HEAT ADVISORY IN EFFECT UNTIL 7 PM EDT THIS EVENING... ...SEVERE THUNDERSTORM WATCH 329 IN EFFECT UNTIL 10 PM EDT THIS EVENING... This Hazardous Weather Outlook is for northern Connecticut, central Massachusetts, eastern Massachusetts, northeastern Massachusetts, southeastern Massachusetts and western Massachusetts. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. Severe Thunderstorm Watch. .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. MAZ002-008-009-012045- Western Franklin MA-Western Hampshire MA-Western Hampden MA- 434 PM EDT Wed Jun 30 2021 ...SEVERE THUNDERSTORM WATCH 329 IN EFFECT UNTIL 10 PM EDT THIS EVENING... This Hazardous Weather Outlook is for western Massachusetts. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. .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. CTZ003-004-MAZ012>019-RIZ001-002-012045- Tolland CT-Windham CT-Southern Worcester MA-Western Norfolk MA- Southeast Middlesex MA-Suffolk MA-Eastern Norfolk MA- Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA- Northwest Providence RI-Southeast Providence RI- 434 PM EDT Wed Jun 30 2021 ...AIR QUALITY ALERT IN EFFECT UNTIL 11 PM EDT THIS EVENING... ...HEAT ADVISORY IN EFFECT UNTIL 7 PM EDT THIS EVENING... ...SEVERE THUNDERSTORM WATCH 329 IN EFFECT UNTIL 10 PM EDT THIS EVENING... This Hazardous Weather Outlook is for northern Connecticut, central Massachusetts, eastern Massachusetts, southeastern Massachusetts and northern Rhode Island. .DAY ONE...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. Heat Advisory. Severe Thunderstorm Watch. .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>237-250-251-254>256-012045- 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- 434 PM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Massachusetts coastal waters and Rhode Island coastal waters. .DAY ONE...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. ANZ230-012045- Boston Harbor- 434 PM EDT Wed Jun 30 2021 ...SEVERE THUNDERSTORM WATCH 329 IN EFFECT UNTIL 10 PM EDT THIS EVENING... This Hazardous Weather Outlook is for Massachusetts coastal waters. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. .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 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
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
451 PM EDT WED JUN 30 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0427 PM TSTM WND DMG MONTAGUE 42.53N 72.53W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREES AND WIRES DOWN ON MONTAGUE CITY ROAD NEAR WALNUT
STREET
&&
EVENT NUMBER BOX2102507
WSPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
457 PM EDT WED JUN 30 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0421 PM TSTM WND DMG ERVING 42.60N 72.40W
06/30/2021 FRANKLIN MA LAW ENFORCEMENT
LARGE TREE AND WIRES DOWN IN ERVING FRENCH KING HIGHWAY
0427 PM TSTM WND DMG MONTAGUE 42.53N 72.53W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREES AND WIRES DOWN ON MONTAGUE CITY ROAD NEAR WALNUT
STREET
0441 PM TSTM WND GST ORANGE AP 42.57N 72.29W
06/30/2021 M58 MPH FRANKLIN MA ASOS
0450 PM TSTM WND DMG GILL 42.65N 72.50W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREES DOWN ON WIRES ON WEST GILL ROAD
&&
EVENT NUMBER BOX2102508 BOX2102507 BOX2102509 BOX2102510
WSPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
606 PM EDT WED JUN 30 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0421 PM TSTM WND DMG ERVING 42.60N 72.40W
06/30/2021 FRANKLIN MA LAW ENFORCEMENT
LARGE TREE AND WIRES DOWN IN ERVING ON FRENCH KING
HIGHWAY
0427 PM TSTM WND DMG MONTAGUE 42.53N 72.53W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREES AND WIRES DOWN ON MONTAGUE CITY ROAD NEAR WALNUT
STREET
0441 PM TSTM WND GST ORANGE AP 42.57N 72.29W
06/30/2021 M58 MPH FRANKLIN MA ASOS
0450 PM TSTM WND DMG GILL 42.65N 72.50W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREES DOWN ON WIRES ON WEST GILL ROAD
0450 PM TSTM WND DMG GILL 42.65N 72.50W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREE DOWN BLOCKING SOUTH CROSS ROAD
0455 PM TSTM WND DMG WARWICK 42.68N 72.33W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREE DOWN BLOCKING ORANGE ROAD
0457 PM TSTM WND DMG BERNARDSTON 42.67N 72.55W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREE DOWN ON WIRES HUCKERVILLE ROAD
0500 PM TSTM WND DMG ORANGE 42.59N 72.30W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREE BRANCH DOWN ON WIRES ON WARWICK RD
0500 PM TSTM WND DMG ATHOL 42.59N 72.23W
06/30/2021 WORCESTER MA TRAINED SPOTTER
TREE DOWN ON HOUSE ON JERI DRIVE. TREE DOWN ON
METROPLOLITAN COURT
0515 PM TSTM WND DMG ATHOL 42.59N 72.23W
06/30/2021 WORCESTER MA LAW ENFORCEMENT
TRANSFORMER BLOWN, WIRES ACROSS ROAD ON PEQUOIG AVE
0521 PM TSTM WND DMG NORTHFIELD 42.71N 72.44W
06/30/2021 FRANKLIN MA LAW ENFORCEMENT
TREES DOWN ACROSS RANDALL RD
0525 PM TSTM WND DMG BARRE 42.42N 72.11W
06/30/2021 WORCESTER MA AMATEUR RADIO
TREE DOWN BLOCKING ROAD AT OLD COLD BROOK ROAD AT
WALNUT HILL ROAD
0530 PM TSTM WND DMG OAKHAM 42.35N 72.05W
06/30/2021 WORCESTER MA AMATEUR RADIO
LARGE TREE DOWN NORTH BROOKFIELD ROAD
0534 PM TSTM WND DMG ERVING 42.60N 72.40W
06/30/2021 FRANKLIN MA LAW ENFORCEMENT
TREE AND WIRES DOWN ACROSS RANDALL RD
0540 PM TSTM WND DMG HAVERHILL 42.78N 71.09W
06/30/2021 ESSEX MA AMATEUR RADIO
TREE DOWN WITH POER POLE SNAPPED IN HALF. WIRES DOWN ON
EAST BROADWAY
0545 PM TSTM WND DMG 2 N DRACUT 42.70N 71.30W
06/30/2021 MIDDLESEX MA TRAINED SPOTTER
LARGE TREE DOWN ON LONGPOND DRIVE
&&
EVENT NUMBER BOX2102508 BOX2102507 BOX2102509 BOX2102510 BOX2102513
BOX2102514 BOX2102515 BOX2102511 BOX2102519 BOX2102512 BOX2102516
BOX2102520 BOX2102521 BOX2102517 BOX2102522 BOX2102518
WSSpecial Weather Statement
National Weather Service Boston/Norton MA
611 PM EDT Wed Jun 30 2021
MAZ005-012-013-016-019-302300-
Southern Worcester MA-Eastern Plymouth MA-Western Norfolk MA-
Central Middlesex County MA-Eastern Norfolk MA-
611 PM EDT Wed Jun 30 2021
...STRONG THUNDERSTORM DEVELOPING...
At 610 PM EDT, Doppler radar was tracking a strong thunderstorm
developing over Upton, or near Milford, moving east at 35 mph.
Wind gusts up to 50 mph will accompany this storm.
Locations impacted include...
Quincy, Weymouth, Braintree, Shrewsbury, Randolph, Franklin, Norwood,
Milford, Milton, Stoughton, Dedham, Walpole, Hingham, Canton,
Westborough, Grafton, Sharon, Rockland, Foxborough and Ashland.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.
&&
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
eastern, central, southeastern and northeastern Massachusetts.
LAT...LON 4219 7079 4211 7078 4211 7081 4213 7082
4213 7083 4216 7085 4215 7088 4217 7089
4204 7122 4206 7176 4226 7170
TIME...MOT...LOC 2210Z 271DEG 36KT 4217 7161
FrankSpecial Weather Statement National Weather Service Boston/Norton MA 639 PM EDT Wed Jun 30 2021 CTZ002-003-MAZ011-302330- Hartford CT-Tolland CT-Eastern Hampden MA- 639 PM EDT Wed Jun 30 2021 ...STRONG THUNDERSTORM... At 639 PM EDT, Doppler radar was tracking a strong thunderstorm over Windsor Locks, or near Windsor, moving east at 30 mph. Pea size hail and winds in excess of 40 mph will accompany this storm. Locations impacted include... Hartford, West Hartford, Manchester, East Hartford, Enfield, Vernon, Windsor, Mansfield, South Windsor, Simsbury, Bloomfield, Avon, Suffield, Ellington, Tolland, Windsor Locks, Coventry, Stafford, Somers and Granby. 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 4179 7287 4201 7287 4203 7226 4175 7222 TIME...MOT...LOC 2239Z 276DEG 28KT 4190 7262 Frank
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
658 PM EDT WED JUN 30 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0421 PM TSTM WND DMG ERVING 42.60N 72.40W
06/30/2021 FRANKLIN MA LAW ENFORCEMENT
LARGE TREE AND WIRES DOWN IN ERVING ON FRENCH KING
HIGHWAY
0427 PM TSTM WND DMG MONTAGUE 42.53N 72.53W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREES AND WIRES DOWN ON MONTAGUE CITY ROAD NEAR WALNUT
STREET
0441 PM TSTM WND GST ORANGE AP 42.57N 72.29W
06/30/2021 M58 MPH FRANKLIN MA ASOS
0450 PM TSTM WND DMG GILL 42.65N 72.50W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREES DOWN ON WIRES ON WEST GILL ROAD
0450 PM TSTM WND DMG GILL 42.65N 72.50W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREE DOWN BLOCKING SOUTH CROSS ROAD
0455 PM TSTM WND DMG WARWICK 42.68N 72.33W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREE DOWN BLOCKING ORANGE ROAD
0457 PM TSTM WND DMG BERNARDSTON 42.67N 72.55W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREE DOWN ON WIRES HUCKERVILLE ROAD
0500 PM TSTM WND DMG ORANGE 42.59N 72.30W
06/30/2021 FRANKLIN MA AMATEUR RADIO
TREE BRANCH DOWN ON WIRES ON WARWICK RD
0500 PM TSTM WND DMG ATHOL 42.59N 72.23W
06/30/2021 WORCESTER MA TRAINED SPOTTER
TREE DOWN ON HOUSE ON JERI DRIVE. TREE DOWN ON
METROPLOLITAN COURT
0515 PM TSTM WND DMG ATHOL 42.59N 72.23W
06/30/2021 WORCESTER MA LAW ENFORCEMENT
TRANSFORMER BLOWN, WIRES ACROSS ROAD ON PEQUOIG AVE
0521 PM TSTM WND DMG NORTHFIELD 42.71N 72.44W
06/30/2021 FRANKLIN MA LAW ENFORCEMENT
TREES DOWN ACROSS RANDALL RD
0525 PM TSTM WND DMG BARRE 42.42N 72.11W
06/30/2021 WORCESTER MA AMATEUR RADIO
TREE DOWN BLOCKING ROAD AT OLD COLD BROOK ROAD AT
WALNUT HILL ROAD
0530 PM TSTM WND DMG OAKHAM 42.35N 72.05W
06/30/2021 WORCESTER MA AMATEUR RADIO
LARGE TREE DOWN NORTH BROOKFIELD ROAD
0534 PM TSTM WND DMG ERVING 42.60N 72.40W
06/30/2021 FRANKLIN MA LAW ENFORCEMENT
TREE AND WIRES DOWN ACROSS RANDALL RD
0537 PM TSTM WND DMG CHELMSFORD 42.60N 71.37W
06/30/2021 MIDDLESEX MA AMATEUR RADIO
TREE DWON ON ACTON ROAD AT HIGH STREET
0539 PM TSTM WND DMG ANDOVER 42.66N 71.14W
06/30/2021 ESSEX MA AMATEUR RADIO
TREE DOWN ON CROSS STREET
0540 PM TSTM WND DMG HAVERHILL 42.78N 71.09W
06/30/2021 ESSEX MA AMATEUR RADIO
TREE DOWN WITH POER POLE SNAPPED IN HALF. WIRES DOWN ON
EAST BROADWAY
0542 PM TSTM WND DMG LEICESTER 42.25N 71.90W
06/30/2021 WORCESTER MA AMATEUR RADIO
LARGE TREE DOWN ON WIRES ON SIANAI STREET
0545 PM TSTM WND DMG 2 N DRACUT 42.70N 71.30W
06/30/2021 MIDDLESEX MA TRAINED SPOTTER
LARGE TREE DOWN ON LONGPOND DRIVE
0616 PM TSTM WND GST PLEASURE BAY 42.33N 71.02W
06/30/2021 M58 MPH SUFFOLK MA MESONET
0620 PM TSTM WND DMG EVERETT 42.41N 71.05W
06/30/2021 MIDDLESEX MA AMATEUR RADIO
TREE DOWN BLOCKING ROAD AT HANCOCK AT CENTRAL STREET
0620 PM TSTM WND DMG LYNN 42.47N 70.96W
06/30/2021 ESSEX MA AMATEUR RADIO
POWER LINES DOWN ON JACKSON STREET
0627 PM TSTM WND GST DEER ISLAND 42.34N 70.95W
06/30/2021 M60 MPH ANZ230 MA MESONET
0636 PM TSTM WND DMG CHELSEA 42.40N 71.03W
06/30/2021 SUFFOLK MA AMATEUR RADIO
TREE DOWN ON WIRES ON CENTER AVE
&&
EVENT NUMBER BOX2102508 BOX2102507 BOX2102509 BOX2102510 BOX2102513
BOX2102514 BOX2102515 BOX2102511 BOX2102519 BOX2102512 BOX2102516
BOX2102520 BOX2102521 BOX2102517 BOX2102525 BOX2102526 BOX2102522
BOX2102527 BOX2102518 BOX2102524 BOX2102528 BOX2102529 BOX2102523
BOX2102530
WSThe Boston radar (KBOX), 110 km away, was scanning. The volume nearest the first event began at 23:24 UTC.
4 thunderstorm wind. Local standard time, as filed.
In Ellington, a tree was down on wires on Maple Street.
In Burlington, a spotter reported the top of a mature oak tree snapped off. Street unknown.
In Woodstock, a tree was down on Child Road.
In Killingly, wires were down on Soap Street.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Connecticut in 2021Every state in 2021This day in weather historyWarnings in Connecticut, June 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 963339, 963340, 963341, 963342.