Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 24, NWS Boston/Norton, MA

June 29, 2021Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 29, 2021, 6:48 PM EDT for Capitol Planning Region, Connecticut. It was in force for 57 min. 2 reports 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: Jun 29, 2021, 6:48 PM EDT (22:48 UTC)
Expired: Jun 29, 2021, 7:45 PM EDT
In force: 57 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Capitol Planning Region, CT

The radar

The Brookhaven radar (KOKX), 94 km from the middle of the area, began a volume at 22:51 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

Time	Report	Where	Remark
Jun 29, 6:55 PM EDT	TSTM WND DMG	Bristol, CT	LARGE TREE DOWN ON JEROME AVE
Jun 29, 6:55 PM EDT	TSTM WND DMG	Bristol, CT	LARGE TREE DOWN ON STURBRIDGE COURT.

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.8 hours before the alert went out and 94 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 681 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 1052 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

169 
WUUS51 KBOX 292248
SVRBOX
CTC003-292345-
/O.NEW.KBOX.SV.W.0024.210629T2248Z-210629T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
648 PM EDT Tue Jun 29 2021

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Southwestern Hartford County in northern Connecticut...

* Until 745 PM EDT.

* At 647 PM EDT, a severe thunderstorm was located over Terryville,
  or near Bristol, moving east 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...
  Hartford, New Britain, West Hartford, Bristol, East Hartford,
  Southington, Glastonbury, Newington, Windsor, Wethersfield, South
  Windsor, Farmington, Simsbury, Bloomfield, Berlin, Rocky Hill,
  Avon, Plainville, Canton and Burlington.

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4180 7296 4181 7294 4187 7263 4164 7260
      4163 7271 4160 7272 4160 7293 4164 7294
      4164 7298 4180 7302
TIME...MOT...LOC 2247Z 263DEG 12KT 4170 7300 

HAIL...0.75IN
WIND...60MPH
 
$$

Loconto

3 follow-up statements

295 
WWUS51 KBOX 292318
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
718 PM EDT Tue Jun 29 2021

CTC003-292345-
/O.CON.KBOX.SV.W.0024.000000T0000Z-210629T2345Z/
Hartford CT-
718 PM EDT Tue Jun 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SOUTHWESTERN HARTFORD COUNTY...

At 718 PM EDT, a severe thunderstorm was located over New Britain,
moving east at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and power lines.

Locations impacted include...
Hartford, New Britain, West Hartford, Bristol, East Hartford,
Southington, Glastonbury, Newington, Windsor, Wethersfield, South
Windsor, Farmington, Bloomfield, Berlin, Rocky Hill, Avon, Plainville
and Burlington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4177 7296 4180 7287 4187 7263 4164 7260
      4163 7271 4162 7274 4162 7290 4164 7294
      4164 7298 4173 7300
TIME...MOT...LOC 2318Z 266DEG 14KT 4170 7281 

HAIL...<.75IN
WIND...60MPH
 
$$

Loconto

023 
WWUS51 KBOX 292330
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
730 PM EDT Tue Jun 29 2021

CTC003-292345-
/O.CON.KBOX.SV.W.0024.000000T0000Z-210629T2345Z/
Hartford CT-
730 PM EDT Tue Jun 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR CENTRAL HARTFORD COUNTY...

At 730 PM EDT, a severe thunderstorm was located over Wethersfield,
moving east at 20 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and power lines.

Locations impacted include...
Hartford, New Britain, West Hartford, East Hartford, Glastonbury,
Newington, Windsor, Wethersfield, South Windsor, Farmington,
Bloomfield, Berlin, Rocky Hill and Avon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4187 7263 4164 7260 4163 7271 4162 7274
      4167 7280 4176 7281 4182 7279
TIME...MOT...LOC 2330Z 263DEG 17KT 4171 7263 

HAIL...<.75IN
WIND...60MPH
 
$$

Loconto

242 
WWUS51 KBOX 292339
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
739 PM EDT Tue Jun 29 2021

CTC003-292346-
/O.EXP.KBOX.SV.W.0024.000000T0000Z-210629T2345Z/
Hartford CT-
739 PM EDT Tue Jun 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL HARTFORD COUNTY WILL
EXPIRE AT 745 PM EDT...
        
The storm which prompted the warning has moved out of much of the 
area. A new severe thunderstorm warning is in effect until 830 PM 
for portions of central Hartford County, including Wethersfield and 
the eastern portion of the city of Hartford.

LAT...LON 4187 7263 4164 7260 4163 7271 4162 7274
      4167 7280 4176 7281 4182 7279
TIME...MOT...LOC 2336Z 263DEG 12KT 4171 7263 

$$

Loconto

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 6:11 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	64 min
Jun 29, 6:59 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	44 min
Jun 29, 7:34 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	56 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.