Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 108, NWS Boston/Norton, MA

August 27, 2021Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut; Hampden County, Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 27, 2021, 4:59 PM EDT for Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut; Hampden County, Hampshire County, Massachusetts. It was in force for 38 min. 7 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: Aug 27, 2021, 4:59 PM EDT (20:59 UTC)
Expired: Aug 27, 2021, 5:37 PM EDT
In force: 38 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Hampden County, MA, Hampshire County, MA

The radar

The Boston radar (KBOX), 117 km from the middle of the area, began a volume at 21:03 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
Aug 27, 5:10 PM EDT	TSTM WND DMG	West Springfield, MA	6 INCH BRANCH DOWN ON ELM STREET
Aug 27, 5:10 PM EDT	TSTM WND DMG	West Springfield, MA	TREE DOWN ON WOODMONT STREET. RELAYED BY AMATEUR RADIO
Aug 27, 5:15 PM EDT	TSTM WND DMG	Chicopee, MA	TREE DOWN ON WIRES ON GRANBY ROAD.
Aug 27, 5:20 PM EDT	TSTM WND DMG	West Springfield, MA	LARGE TREE AND WIRES DOWN BLOCKING PIPER ROAD, WIRES ALSO DOWN ON VINCENT DRIVE...MORGAN ROAD AND SMYRNA STREET.
Aug 27, 5:20 PM EDT	TSTM WND DMG	West Springfield, MA	LARGE TREE DOWN ON HOUSE ON CHURCHILL STREET.
Aug 27, 5:20 PM EDT	TSTM WND DMG	West Springfield, MA	TREE DOWN ON AMOSTOWN ROAD AT FAUSEY DRIVE. RELAYED VIA AMATEUR RADIO.
Aug 27, 5:23 PM EDT	TSTM WND DMG	Westfield, MA	LARGE LIMB DOWN ON HOUSE ON KING STREET.

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

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 9.0 hours before the alert went out and 127 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: 325 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 983 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -39 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.7

Open this sounding in Storm Lab

The text

As transmitted.

309 
WUUS51 KBOX 272059
SVRBOX
CTC003-013-015-MAC013-015-272200-
/O.NEW.KBOX.SV.W.0108.210827T2059Z-210827T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
459 PM EDT Fri Aug 27 2021

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Northwestern Windham County in northern Connecticut...
  Northern Tolland County in northern Connecticut...
  Northeastern Hartford County in northern Connecticut...
  South central Hampshire County in western Massachusetts...
  Southeastern Hampden County in western Massachusetts...

* Until 600 PM EDT.

* At 457 PM EDT, a severe thunderstorm was located over West
  Springfield, moving southeast at 20 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, Chicopee, Enfield, Westfield, Holyoke, Vernon, Agawam,
  West Springfield, Ludlow, South Hadley, Longmeadow, Suffield, East
  Longmeadow, Ellington, Tolland, Wilbraham, Coventry, Stafford,
  Somers and East Windsor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4214 7278 4226 7259 4196 7215 4178 7243
TIME...MOT...LOC 2057Z 318DEG 17KT 4215 7263 

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

$$

Belk

2 follow-up statements

193 
WWUS51 KBOX 272124
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
524 PM EDT Fri Aug 27 2021

CTC015-MAC015-272132-
/O.CAN.KBOX.SV.W.0108.000000T0000Z-210827T2200Z/
Windham CT-Hampshire MA-
524 PM EDT Fri Aug 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WINDHAM AND SOUTH
CENTRAL HAMPSHIRE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4206 7270 4218 7253 4197 7219 4179 7244
TIME...MOT...LOC 2122Z 317DEG 15KT 4207 7256 

$$

CTC003-013-MAC013-272200-
/O.CON.KBOX.SV.W.0108.000000T0000Z-210827T2200Z/
Tolland CT-Hartford CT-Hampden MA-
524 PM EDT Fri Aug 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHWESTERN TOLLAND...NORTHEASTERN HARTFORD AND SOUTH CENTRAL
HAMPDEN COUNTIES...

At 522 PM EDT, a severe thunderstorm was located over Longmeadow, or
near Springfield, moving southeast at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Springfield, Chicopee, Enfield, Vernon, Agawam, West Springfield,
Ludlow, Longmeadow, Suffield, East Longmeadow, Ellington, Tolland,
Wilbraham, Coventry, Stafford, Somers, East Windsor, Monson,
Willington and Hampden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4206 7270 4218 7253 4197 7219 4179 7244
TIME...MOT...LOC 2122Z 317DEG 15KT 4207 7256 

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

$$

Belk

273 
WWUS51 KBOX 272137
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
537 PM EDT Fri Aug 27 2021

CTC003-013-MAC013-272147-
/O.CAN.KBOX.SV.W.0108.000000T0000Z-210827T2200Z/
Tolland CT-Hartford CT-Hampden MA-
537 PM EDT Fri Aug 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN TOLLAND...
NORTHEASTERN HARTFORD AND SOUTH CENTRAL HAMPDEN 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 4206 7270 4218 7253 4197 7219 4179 7244
TIME...MOT...LOC 2135Z 318DEG 17KT 4202 7250 

$$

Belk

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 5:20 PM EDT	Special Weather Statement	BOX		55 min
Aug 27, 2:13 PM EDT	Special Marine Warning	BOX		47 min
Aug 27, 3:25 PM EDT	Small Craft Advisory	BOX		24 hr
Aug 27, 4:37 PM EDT	Special Weather Statement	BOX	Hampden	53 min
Aug 27, 4:44 PM EDT	Special Weather Statement	BOX	Norfolk	61 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.