Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 131, NWS Boston/Norton, MA

December 11, 2021Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Dec 11, 2021, 10:21 PM EST for Capitol Planning Region, Connecticut. It was in force for 39 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: Dec 11, 2021, 10:21 PM EST (03:21 UTC)
Expired: Dec 11, 2021, 11:00 PM EST
In force: 39 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), 109 km from the middle of the area, began a volume at 03:24 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 00:00Z, 3.4 hours before the alert went out and 109 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 537 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 428 m²/s²
0-3 km storm-relative helicity: 485 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

278 
WUUS51 KBOX 120321
SVRBOX
CTC003-013-120400-
/O.NEW.KBOX.SV.W.0131.211212T0321Z-211212T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
1021 PM EST Sat Dec 11 2021

The National Weather Service in Boston/Norton has issued a

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

* Until 1100 PM EST.

* At 1021 PM EST, a line of intense showers capable of producing 
  damaging winds extended from near Hartland to near Woodbury 
  Center, moving east at 60 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, Manchester, East
  Hartford, Enfield, Southington, Glastonbury, Newington, Vernon,
  Windsor, Agawam, Wethersfield, Mansfield, South Windsor,
  Farmington, Windham, Simsbury and Bloomfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4204 7301 4204 7282 4200 7281 4204 7275
      4203 7210 4196 7210 4196 7222 4175 7216
      4172 7225 4160 7234 4158 7246 4165 7251
      4164 7266 4155 7285 4156 7295 4180 7302
      4181 7295 4197 7289 4197 7303
TIME...MOT...LOC 0321Z 260DEG 52KT 4202 7299 4155 7328 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Loconto

1 follow-up statement

153 
WWUS51 KBOX 120350
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
1050 PM EST Sat Dec 11 2021

CTC003-013-120400-
/O.EXP.KBOX.SV.W.0131.000000T0000Z-211212T0400Z/
Tolland CT-Hartford CT-
1050 PM EST Sat Dec 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR TOLLAND AND HARTFORD COUNTIES
WILL EXPIRE AT 1100 PM EST...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty 
winds are still possible. A Wind Advisory is in effect until 5 AM 
Sunday.

LAT...LON 4204 7301 4204 7282 4200 7281 4204 7275
      4203 7210 4196 7210 4196 7222 4175 7216
      4172 7225 4160 7234 4158 7246 4165 7251
      4164 7266 4155 7285 4156 7295 4180 7302
      4181 7295 4197 7289 4197 7303
TIME...MOT...LOC 0350Z 260DEG 52KT 4207 7259 4160 7288 

$$

Loconto

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.