Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 16, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 9, 2021, 3:23 PM EDT for Capitol Planning Region, Connecticut. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 9, 2021, 3:23 PM EDT (19:23 UTC)
- Expired
- Jun 9, 2021, 4:30 PM EDT
- In force
- 67 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Capitol Planning Region, CT
The radar
The Brookhaven radar (KOKX), 115 km from the middle of the area, began a volume at 19:26 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.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 7.4 hours before the alert went out and 115 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.
- Mixed-layer CAPE
- 556 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 927 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
The text
As transmitted.
576
WUUS51 KBOX 091923
SVRBOX
CTC003-013-092030-
/O.NEW.KBOX.SV.W.0016.210609T1923Z-210609T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
323 PM EDT Wed Jun 9 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Northwestern Tolland County in northern Connecticut...
Northeastern Hartford County in northern Connecticut...
* Until 430 PM EDT.
* At 323 PM EDT, a severe thunderstorm was located over East Windsor,
or near Enfield, moving southeast at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
* Locations impacted include...
Manchester, East Hartford, Enfield, Glastonbury, Vernon, Windsor,
Mansfield, South Windsor, Suffield, Ellington, Tolland, Windsor
Locks, Coventry, Somers, East Windsor, Hebron, Willington, Bolton
and Andover.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4192 7270 4203 7249 4181 7225 4166 7259
TIME...MOT...LOC 1923Z 330DEG 11KT 4192 7253
HAIL...1.00IN
WIND...60MPH
$$
Frank5 follow-up statements
765
WWUS51 KBOX 091929
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
329 PM EDT Wed Jun 9 2021
CTC003-013-092030-
/O.CON.KBOX.SV.W.0016.000000T0000Z-210609T2030Z/
Tolland CT-Hartford CT-
329 PM EDT Wed Jun 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHWESTERN TOLLAND AND NORTHEASTERN HARTFORD COUNTIES...
At 329 PM EDT, a severe thunderstorm was located over South Windsor,
moving southeast at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Manchester, East Hartford, Enfield, Glastonbury, Vernon, Windsor,
Mansfield, South Windsor, Suffield, Ellington, Tolland, Windsor
Locks, Coventry, Somers, East Windsor, Hebron, Willington, Bolton and
Andover.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4192 7270 4203 7249 4181 7225 4166 7259
TIME...MOT...LOC 1929Z 325DEG 13KT 4186 7259
HAIL...1.00IN
WIND...60MPH
$$
Frank675 WWUS51 KBOX 091942 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 342 PM EDT Wed Jun 9 2021 CTC003-013-092030- /O.CON.KBOX.SV.W.0016.000000T0000Z-210609T2030Z/ Tolland CT-Hartford CT- 342 PM EDT Wed Jun 9 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR NORTHWESTERN TOLLAND AND EAST CENTRAL HARTFORD COUNTIES... At 342 PM EDT, a severe thunderstorm was located over South Windsor, moving southeast at 15 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. Locations impacted include... Manchester, East Hartford, Enfield, Glastonbury, Vernon, Windsor, Mansfield, South Windsor, Ellington, Tolland, Coventry, Somers, East Windsor, Hebron, Willington, Bolton and Andover. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4187 7268 4199 7244 4181 7225 4166 7259 TIME...MOT...LOC 1942Z 318DEG 10KT 4180 7257 HAIL...0.75IN WIND...60MPH $$ Frank
604
WWUS51 KBOX 091955
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
355 PM EDT Wed Jun 9 2021
CTC003-013-092030-
/O.CON.KBOX.SV.W.0016.000000T0000Z-210609T2030Z/
Tolland CT-Hartford CT-
355 PM EDT Wed Jun 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR WEST CENTRAL TOLLAND AND EAST CENTRAL HARTFORD COUNTIES...
At 354 PM EDT, a severe thunderstorm was located over East Hartford,
moving southeast at 15 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Manchester, East Hartford, Glastonbury, Vernon, Windsor, South
Windsor, Ellington, Tolland, Coventry, East Windsor, Bolton and
Andover.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4188 7265 4193 7249 4177 7235 4166 7259
4187 7268
TIME...MOT...LOC 1954Z 335DEG 14KT 4176 7260
HAIL...<.75IN
WIND...60MPH
$$
Frank272
WWUS51 KBOX 092004
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
404 PM EDT Wed Jun 9 2021
CTC013-092013-
/O.CAN.KBOX.SV.W.0016.000000T0000Z-210609T2030Z/
Tolland CT-
404 PM EDT Wed Jun 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL TOLLAND COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been
cancelled.
LAT...LON 4185 7257 4173 7245 4170 7249 4166 7259
4174 7263 4185 7267
TIME...MOT...LOC 2003Z 330DEG 11KT 4174 7258
$$
CTC003-092030-
/O.CON.KBOX.SV.W.0016.000000T0000Z-210609T2030Z/
Hartford CT-
404 PM EDT Wed Jun 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR EAST CENTRAL HARTFORD COUNTY...
At 403 PM EDT, a severe thunderstorm was located over East Hartford,
moving southeast at 15 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Hartford, Manchester, East Hartford, Glastonbury, Windsor, South
Windsor and Bolton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4185 7257 4173 7245 4170 7249 4166 7259
4174 7263 4185 7267
TIME...MOT...LOC 2003Z 330DEG 11KT 4174 7258
HAIL...<.75IN
WIND...60MPH
$$
Frank917
WWUS51 KBOX 092022
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
422 PM EDT Wed Jun 9 2021
CTC003-092030-
/O.EXP.KBOX.SV.W.0016.000000T0000Z-210609T2030Z/
Hartford CT-
422 PM EDT Wed Jun 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL HARTFORD COUNTY
WILL EXPIRE AT 430 PM EDT...
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning will be allowed to expire. Heavy rain,
gusty winds and dangerous cloud to ground lightning are still
expected with this storm.
LAT...LON 4185 7257 4173 7245 4170 7249 4166 7259
4174 7263 4185 7267
TIME...MOT...LOC 2020Z 330DEG 11KT 4170 7255
$$
FrankThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 3:12 AM EDT | Heat Advisory | BOX | Capitol Planning Region, Northeastern Connecticut Planning Region | 17 hr |
| Jun 9, 3:11 PM EDT | Special Weather Statement | BOX | 49 min |
Nearby
Severe Thunderstorm Warnings in Connecticut, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.