Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 123, NWS Boston/Norton, MA

November 13, 2021Hampden County, Massachusetts; Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Nov 13, 2021, 4:09 PM EST for Hampden County, Massachusetts; Capitol Planning Region, Connecticut. It was in force for 15 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: Nov 13, 2021, 4:09 PM EST (21:09 UTC)
Expired: Nov 13, 2021, 4:24 PM EST
In force: 15 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Capitol Planning Region, CT, Hampden County, MA

The radar

The Boston radar (KBOX), 120 km from the middle of the area, began a volume at 21:10 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
Nov 13, 12:27 PM EST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 9.2 hours before the alert went out and 128 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: 1704 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 246 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

430 
WUUS51 KBOX 132109
SVRBOX
CTC003-013-MAC013-132145-
/O.NEW.KBOX.SV.W.0123.211113T2109Z-211113T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
409 PM EST Sat Nov 13 2021

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Northwestern Tolland County in northern Connecticut...
  Northeastern Hartford County in northern Connecticut...
  Southeastern Hampden County in western Massachusetts...

* Until 445 PM EST.

* At 409 PM EST, a severe thunderstorm was located over Suffield, or
  near Enfield, moving northeast at 40 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Springfield, Enfield, Windsor, Agawam, West Springfield, Ludlow,
  Longmeadow, Suffield, East Longmeadow, Wilbraham, Windsor Locks,
  Palmer, Stafford, Somers, Granby, East Windsor, Monson, East Granby
  and Hampden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4191 7273 4199 7279 4221 7242 4200 7225
TIME...MOT...LOC 2109Z 242DEG 35KT 4198 7265 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Chai

1 follow-up statement

401 
WWUS51 KBOX 132124
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
424 PM EST Sat Nov 13 2021

CTC003-013-MAC013-132134-
/O.CAN.KBOX.SV.W.0123.000000T0000Z-211113T2145Z/
Tolland CT-Hartford CT-Hampden MA-
424 PM EST Sat Nov 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN TOLLAND...
NORTHEASTERN HARTFORD AND SOUTHEASTERN HAMPDEN COUNTIES IS
CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However gusty winds are still possible with this
thunderstorm.

A Severe Thunderstorm Watch remains in effect until 700 PM EST for
northern Connecticut.

LAT...LON 4191 7273 4199 7279 4221 7242 4200 7225
TIME...MOT...LOC 2121Z 242DEG 35KT 4204 7249 

$$

Chai

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 12, 9:39 PM EST	Gale Warning	BOX		29 hr
Nov 13, 4:45 PM EST	Special Marine Warning	BOX		60 min
Nov 13, 5:01 PM EST	Severe Thunderstorm Warning	BOX	Worcester	26 min
Nov 13, 5:08 PM EST	Tornado Warning	BOX	Bristol	24 min
Nov 13, 5:12 PM EST	Severe Thunderstorm Warning	BOX	Bristol, Plymouth	44 min
Nov 13, 5:17 PM EST	Severe Thunderstorm Warning	BOX	Bristol, Middlesex, Norfolk, Plymouth, Worcester	7 min
Nov 13, 5:21 PM EST	Tornado Warning	BOX	Bristol, Norfolk	24 min
Nov 13, 5:22 PM EST	Special Marine Warning	BOX		53 min
Nov 13, 5:26 PM EST	Severe Thunderstorm Warning	BOX	Bristol, Middlesex, Norfolk, Plymouth, Suffolk, Worcester	32 min
Nov 13, 5:45 PM EST	Special Weather Statement	BOX	Bristol, Plymouth	45 min
Nov 13, 5:45 PM EST	Severe Thunderstorm Warning	BOX	Barnstable, Dukes, Plymouth	60 min
Nov 13, 5:47 PM EST	Tornado Warning	BOX	Dukes	28 min
Nov 13, 5:55 PM EST	Severe Thunderstorm Warning	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk	25 min
Nov 13, 6:02 PM EST	Special Marine Warning	BOX		58 min
Nov 13, 6:07 PM EST	Tornado Warning	BOX	Barnstable, Dukes	23 min
Nov 13, 6:13 PM EST	Special Marine Warning	BOX		92 min
Nov 13, 6:27 PM EST	Tornado Warning	BOX	Barnstable	15 min
Nov 13, 6:49 PM EST	Special Weather Statement	BOX	Barnstable	41 min
Nov 13, 3:46 PM EST	Special Weather Statement	BOX		44 min
Nov 13, 4:41 PM EST	Special Weather Statement	BOX		49 min
Nov 13, 5:02 PM EST	Tornado Warning	BOX	Northeastern Connecticut Planning Region	28 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2021 Severe Thunderstorm Warnings in Massachusetts, 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.