Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 6, NWS Boston/Norton, MA

May 26, 2021Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 26, 2021, 7:40 PM EDT for Capitol Planning Region, Connecticut. It was in force for 65 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: May 26, 2021, 7:40 PM EDT (23:40 UTC)
Expired: May 26, 2021, 8:45 PM EDT
In force: 65 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), 90 km from the middle of the area, began a volume at 23:43 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 26, 3:56 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.7 hours before the alert went out and 90 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: 5 J/kg
Mixed-layer CIN: -233 J/kg
Mixed-layer LCL: 554 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

470 
WUUS51 KBOX 262340
SVRBOX
CTC003-013-270045-
/O.NEW.KBOX.SV.W.0006.210526T2340Z-210527T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
740 PM EDT Wed May 26 2021

The National Weather Service in Boston/Norton has issued a

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

* Until 845 PM EDT.

* At 740 PM EDT, severe thunderstorms were located along a line
  extending from Canton to Litchfield, moving east at 35 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, Southington, Glastonbury, Newington, Vernon, Windsor,
  Wethersfield, Mansfield, South Windsor, Farmington, Simsbury,
  Bloomfield, Berlin, Rocky Hill and Avon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4181 7295 4188 7295 4191 7291 4189 7222
      4159 7242 4158 7246 4165 7251 4163 7271
      4161 7271 4158 7276 4155 7282 4157 7285
      4155 7285 4156 7288 4156 7295 4163 7293
      4164 7294 4164 7299 4179 7302
TIME...MOT...LOC 2340Z 282DEG 30KT 4186 7293 4174 7320 

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

Nocera

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 7:05 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	55 min
May 26, 7:45 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	60 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.