Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 116, NWS Boston/Norton, MA

September 24, 2021Hampshire County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 24, 2021, 8:23 AM EDT for Hampshire County, Worcester County, Massachusetts. 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: Sep 24, 2021, 8:23 AM EDT (12:23 UTC)
Expired: Sep 24, 2021, 8:38 AM EDT
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 Hampshire County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 103 km from the middle of the area, began a volume at 12:27 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

Albany, NY (KALY), launched 12:00Z, 0.4 hours before the alert went out and 137 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: 1243 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

944 
WUUS51 KBOX 241223
SVRBOX
MAC015-027-241300-
/O.NEW.KBOX.SV.W.0116.210924T1223Z-210924T1300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
823 AM EDT Fri Sep 24 2021

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  West central Worcester County in central Massachusetts...
  East central Hampshire County in western Massachusetts...

* Until 900 AM EDT.

* At 823 AM EDT, a severe thunderstorm was located over Hardwick, or
  16 miles south of Orange, moving north at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Athol, Ware, Templeton, Barre, Hubbardston, West Brookfield,
  Hardwick, Phillipston, Petersham and New Braintree.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4251 7199 4229 7217 4232 7230 4251 7225
      4251 7224 4252 7225 4256 7224
TIME...MOT...LOC 1223Z 199DEG 19KT 4238 7219 

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

$$

Chai

1 follow-up statement

988 
WWUS51 KBOX 241238
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
838 AM EDT Fri Sep 24 2021

MAC015-027-241248-
/O.CAN.KBOX.SV.W.0116.000000T0000Z-210924T1300Z/
Worcester MA-Hampshire MA-
838 AM EDT Fri Sep 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL WORCESTER AND
EAST CENTRAL HAMPSHIRE COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

LAT...LON 4251 7199 4229 7217 4232 7230 4251 7225
      4251 7224 4252 7225 4256 7224
TIME...MOT...LOC 1236Z 199DEG 19KT 4246 7215 

$$

Chai

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 24, 11:11 AM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	22 min
Sep 24, 12:19 PM EDT	Special Marine Warning	BOX		56 min
Sep 24, 12:36 PM EDT	Special Weather Statement	BOX	Norfolk	54 min

Nearby

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.