Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 10, NWS Boston/Norton, MA

June 4, 2021Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 4, 2021, 5:53 PM EDT for Capitol Planning Region, Connecticut. It was in force for 37 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 4, 2021, 5:53 PM EDT (21:53 UTC)
Expired: Jun 4, 2021, 6:30 PM EDT
In force: 37 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), 92 km from the middle of the area, began a volume at 21:57 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, 9.9 hours before the alert went out and 92 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: 233 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 526 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

109 
WUUS51 KBOX 042153
SVRBOX
CTC003-013-042230-
/O.NEW.KBOX.SV.W.0010.210604T2153Z-210604T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
553 PM EDT Fri Jun 4 2021

The National Weather Service in Boston/Norton has issued a

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

* Until 630 PM EDT.

* At 553 PM EDT, a severe thunderstorm was located over Marlborough,
  or near Glastonbury, and is nearly stationary.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Public.

  IMPACT...Expect wind damage to trees and power lines. Minor hail 
           damage to vehicles is possible.

* Locations impacted include...
  Glastonbury, Hebron and Marlborough. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

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.

&&

LAT...LON 4170 7254 4170 7242 4164 7233 4160 7234
      4160 7238 4159 7239 4160 7241 4158 7246
      4159 7246 4165 7251 4164 7255
TIME...MOT...LOC 2153Z 336DEG 2KT 4164 7249 

HAIL...1.00IN
WIND...60MPH
 
$$

Belk

1 follow-up statement

430 
WWUS51 KBOX 042226
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
626 PM EDT Fri Jun 4 2021

CTC003-013-042236-
/O.EXP.KBOX.SV.W.0010.000000T0000Z-210604T2230Z/
Tolland CT-Hartford CT-
626 PM EDT Fri Jun 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN TOLLAND AND
SOUTHEASTERN HARTFORD COUNTIES WILL EXPIRE AT 630 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However small hail
and heavy rain are still possible with this thunderstorm.

LAT...LON 4170 7254 4170 7242 4164 7233 4160 7234
      4160 7238 4159 7239 4160 7241 4158 7246
      4159 7246 4165 7251 4164 7255
TIME...MOT...LOC 2226Z 344DEG 4KT 4161 7249 

$$

Belk

The office that day

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

Issued	Product	Office	Lasted
Jun 4, 1:29 PM EDT	Special Weather Statement	BOX	31 min
Jun 4, 1:37 PM EDT	Special Weather Statement	BOX	23 min
Jun 4, 1:56 PM EDT	Special Weather Statement	BOX	49 min
Jun 4, 3:15 PM EDT	Special Weather Statement	BOX	30 min
Jun 4, 3:51 PM EDT	Special Weather Statement	BOX	39 min
Jun 4, 4:25 PM EDT	Special Weather Statement	BOX	5 min
Jun 4, 4:30 PM EDT	Special Weather Statement	BOX	45 min
Jun 4, 4:53 PM EDT	Special Weather Statement	BOX	52 min
Jun 4, 5:25 PM EDT	Special Weather Statement	BOX	35 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.