Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 57, NWS Boston/Norton, MA

July 7, 2021Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 7, 2021, 4:50 PM EDT for Capitol Planning Region, Connecticut. It was in force for 55 min. 5 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: Jul 7, 2021, 4:50 PM EDT (20:50 UTC)
Expired: Jul 7, 2021, 5:45 PM EDT
In force: 55 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), 120 km from the middle of the area, began a volume at 20:54 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
Jul 7, 5:05 PM EDT	TSTM WND DMG	Suffield, CT	POWER LINES DOWN ON RTE 75
Jul 7, 5:08 PM EDT	TSTM WND GST 61	Bradley Ap, CT
Jul 7, 5:08 PM EDT	NON-TSTM WND GST 61	Bradley Ap, CT
Jul 7, 5:25 PM EDT	TSTM WND DMG	East Hartford, CT	TREE DOWN ON INTERSTATE 291 AT RTE 384 BLOCKING RIGHT HAND LANE
Jul 7, 5:25 PM EDT	TSTM WND DMG	South Windsor, CT	LARGE TREE DOWN ON PLEASANT VALLEY ROAD

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 7, 2:41 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 8.8 hours before the alert went out and 118 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: 18 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 923 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

060 
WUUS51 KBOX 072050
SVRBOX
CTC003-072145-
/O.NEW.KBOX.SV.W.0057.210707T2050Z-210707T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
450 PM EDT Wed Jul 7 2021

The National Weather Service in Boston/Norton has issued a

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

* Until 545 PM EDT.

* At 450 PM EDT, a severe thunderstorm was located near Hartland, or
  13 miles northeast of Torrington, moving southeast at 30 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...
  Hartford, West Hartford, Manchester, East Hartford, Enfield,
  Glastonbury, Newington, Windsor, Wethersfield, South Windsor,
  Simsbury, Bloomfield, Rocky Hill, Avon, Suffield, Ellington,
  Windsor Locks, Granby, East Windsor and Canton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4204 7298 4204 7282 4200 7281 4200 7277
      4204 7275 4201 7259 4193 7251 4186 7251
      4167 7265 4186 7296 4189 7294 4190 7291
      4197 7289 4197 7303
TIME...MOT...LOC 2050Z 302DEG 25KT 4196 7292 

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

Chai

2 follow-up statements

920 
WWUS51 KBOX 072059
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
459 PM EDT Wed Jul 7 2021

CTC003-072145-
/O.CON.KBOX.SV.W.0057.000000T0000Z-210707T2145Z/
Hartford CT-
459 PM EDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR NORTHERN HARTFORD COUNTY...

At 458 PM EDT, a severe thunderstorm was located near Granby, or 10
miles northwest of Windsor, moving southeast at 30 mph.

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

SOURCE...Radar indicated. Picture of possible wall cloud near BDL on 
         social media. 

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

Locations impacted include...
Hartford, West Hartford, Manchester, East Hartford, Enfield,
Glastonbury, Newington, Windsor, Wethersfield, South Windsor,
Simsbury, Bloomfield, Rocky Hill, Avon, Suffield, Ellington, Windsor
Locks, Granby, East Windsor and Canton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4204 7298 4204 7282 4200 7281 4200 7277
      4204 7275 4201 7259 4193 7251 4186 7251
      4167 7265 4186 7296 4189 7294 4190 7291
      4197 7289 4197 7303
TIME...MOT...LOC 2058Z 302DEG 25KT 4193 7286 

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

Chai

581 
WWUS51 KBOX 072117
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
517 PM EDT Wed Jul 7 2021

CTC003-072145-
/O.CON.KBOX.SV.W.0057.000000T0000Z-210707T2145Z/
Hartford CT-
517 PM EDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR CENTRAL HARTFORD COUNTY...

At 517 PM EDT, a severe thunderstorm was located over Bloomfield, or
over Windsor, moving southeast at 30 mph.

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

SOURCE...Radar indicated. 53 kt gust reported at BDL at 512 PM. 

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

Locations impacted include...
Hartford, West Hartford, Manchester, East Hartford, Enfield,
Glastonbury, Newington, Windsor, Wethersfield, South Windsor,
Simsbury, Bloomfield, Rocky Hill, Avon, Suffield, Ellington, Windsor
Locks, East Windsor and East Granby.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4191 7279 4203 7269 4201 7259 4193 7251
      4186 7251 4167 7265 4181 7288
TIME...MOT...LOC 2117Z 302DEG 25KT 4186 7271 

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

Chai

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 4:00 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	60 min
Jul 7, 5:30 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	60 min
Jul 7, 5:53 PM EDT	Special Weather Statement	BOX		52 min
Jul 7, 6:17 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	58 min
Jul 7, 6:38 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	43 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.