Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 25, NWS Boston/Norton, MA

June 29, 2021Capitol Planning Region, Connecticut; Hampden County, Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 29, 2021, 6:59 PM EDT for Capitol Planning Region, Connecticut; Hampden County, Hampshire County, Massachusetts. It was in force for 44 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: Jun 29, 2021, 6:59 PM EDT (22:59 UTC)
Expired: Jun 29, 2021, 7:43 PM EDT
In force: 44 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Albany radar (KENX), 123 km from the middle of the area, began a volume at 23:02 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
Jun 29, 7:08 PM EDT	TSTM WND DMG	Southwick, MA	ONE FOOT DIAMETER TREE DOWN ACROSS RISING CORNER ROAD AT THE AGAWAM TOWN LINE
Jun 29, 7:18 PM EDT	TSTM WND DMG	Agawam, MA	TREES AND WIRES DOWN ON MAIN STREET
Jun 29, 7:20 PM EDT	TSTM WND DMG	Enfield, CT	* 2 INJ * LARGE TREE DOWN ON A HOUSE ON NEVINS AVENUE. 2 PEOPLE HAD TO BE FREED FROM THE HOUSE AND WERE TRANSPORTED TO THE HOSPITAL.
Jun 29, 7:23 PM EDT	TSTM WND DMG	Springfield, MA	TREE AND WIRES DOWN ON RIVER ROAD AND TREE DOWN ON MAIN STREET
Jun 29, 7:32 PM EDT	TSTM WND DMG	Longmeadow, MA	SEVERAL LARGE TREES DOWN MAPLE STREET
Jun 29, 7:32 PM EDT	TSTM WND DMG	Longmeadow, MA	TREE DOWN ON HOUSE ON NEVINS ROAD
Jun 29, 7:40 PM EDT	TSTM WND DMG	Somers, CT	TREES AND WIRES DOWN ON MAPLE STREET NEAR THE ENFIELD TOWN LINE

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, 11.0 hours before the alert went out and 114 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: 333 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1057 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

011 
WUUS51 KBOX 292259
SVRBOX
CTC003-013-MAC013-015-300000-
/O.NEW.KBOX.SV.W.0025.210629T2259Z-210630T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
659 PM EDT Tue Jun 29 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...
  South central Hampshire County in western Massachusetts...
  Southern Hampden County in western Massachusetts...

* Until 800 PM EDT.

* At 658 PM EDT, severe thunderstorms were clustered over Southwick, 
  or near Westfield, moving east at 15 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, Agawam, West
  Springfield, Ludlow, Longmeadow, Suffield, East Longmeadow,
  Ellington, Tolland, Belchertown, Wilbraham, Windsor Locks, Palmer,
  Stafford, Somers and Granby.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. 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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4220 7292 4221 7231 4191 7233 4195 7290
      4197 7289 4197 7293
TIME...MOT...LOC 2258Z 271DEG 13KT 4208 7278 

HAIL...0.75IN
WIND...60MPH
 
$$

Loconto

3 follow-up statements

381 
WWUS51 KBOX 292315
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
715 PM EDT Tue Jun 29 2021

CTC003-013-MAC013-015-300000-
/O.CON.KBOX.SV.W.0025.000000T0000Z-210630T0000Z/
Tolland CT-Hartford CT-Hampshire MA-Hampden MA-
715 PM EDT Tue Jun 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHWESTERN TOLLAND...NORTHEASTERN HARTFORD...SOUTH CENTRAL
HAMPSHIRE AND SOUTHERN HAMPDEN COUNTIES...

At 714 PM EDT, a severe thunderstorm was located over Agawam, moving
east at 15 mph.

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

SOURCE...Amateur radio and emergency management. At 708 PM, a tree 
         was downed on the Southwick and Agawam town line.

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

Locations impacted include...
Springfield, Chicopee, Enfield, Westfield, Holyoke, Agawam, West
Springfield, Ludlow, Longmeadow, Suffield, East Longmeadow,
Ellington, Tolland, Belchertown, Wilbraham, Windsor Locks, Palmer,
Stafford, Somers and Granby.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4220 7281 4221 7231 4191 7233 4195 7290
      4197 7289 4197 7293
TIME...MOT...LOC 2314Z 271DEG 13KT 4208 7270 

HAIL...0.75IN
WIND...60MPH
 
$$

Loconto

875 
WWUS51 KBOX 292328
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
728 PM EDT Tue Jun 29 2021

MAC015-292337-
/O.CAN.KBOX.SV.W.0025.000000T0000Z-210630T0000Z/
Hampshire MA-
728 PM EDT Tue Jun 29 2021

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

LAT...LON 4217 7259 4216 7232 4191 7233 4195 7290
      4206 7274
TIME...MOT...LOC 2327Z 271DEG 13KT 4208 7264 

$$

CTC003-013-MAC013-300000-
/O.CON.KBOX.SV.W.0025.000000T0000Z-210630T0000Z/
Tolland CT-Hartford CT-Hampden MA-
728 PM EDT Tue Jun 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHWESTERN TOLLAND...NORTHEASTERN HARTFORD AND SOUTHEASTERN
HAMPDEN COUNTIES...

At 727 PM EDT, a severe thunderstorm was located over Agawam, moving
east at 15 mph.

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

SOURCE...Amateur radio and Emergency management. At 708 PM, a tree 
         was downed on the Southwick and Agawam town line.

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

Locations impacted include...
Springfield, Chicopee, Enfield, Agawam, West Springfield, Ludlow,
Longmeadow, Suffield, East Longmeadow, Ellington, Tolland, Wilbraham,
Windsor Locks, Palmer, Stafford, Somers, Granby, East Windsor,
Southwick and Monson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4217 7259 4216 7232 4191 7233 4195 7290
      4206 7274
TIME...MOT...LOC 2327Z 271DEG 13KT 4208 7264 

HAIL...0.75IN
WIND...60MPH
 
$$

Loconto

095 
WWUS51 KBOX 292343
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
743 PM EDT Tue Jun 29 2021

CTC003-013-MAC013-292351-
/O.CAN.KBOX.SV.W.0025.000000T0000Z-210630T0000Z/
Tolland CT-Hartford CT-Hampden MA-
743 PM EDT Tue Jun 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN TOLLAND...
NORTHEASTERN HARTFORD AND SOUTHEASTERN HAMPDEN COUNTIES IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area. A 
replacement Severe Thunderstorm Warning has been issued through 830 
PM for southeastern Hampden and northeastern Hartford Counties. 

LAT...LON 4217 7259 4216 7232 4191 7233 4195 7290
      4206 7274
TIME...MOT...LOC 2336Z 271DEG 13KT 4208 7257 

$$

Loconto

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 6:11 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	64 min
Jun 29, 6:48 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	57 min
Jun 29, 7:34 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	56 min
Jun 29, 2:26 AM EDT	Small Craft Advisory	BOX		8 hr
Jun 29, 4:44 PM EDT	Special Weather Statement	BOX	Hampden	31 min
Jun 29, 5:00 PM EDT	Special Weather Statement	BOX	Norfolk	45 min
Jun 29, 5:34 PM EDT	Special Weather Statement	BOX	Worcester	41 min
Jun 29, 5:56 PM EDT	Special Weather Statement	BOX	Franklin	49 min
Jun 29, 6:03 PM EDT	Special Weather Statement	BOX	Plymouth	42 min
Jun 29, 6:07 PM EDT	Special Weather Statement	BOX	Hampden, Hampshire	38 min
Jun 29, 6:28 PM EDT	Special Marine Warning	BOX		47 min
Jun 29, 6:32 PM EDT	Special Weather Statement	BOX	Hampden	43 min
Jun 29, 7:22 PM EDT	Special Weather Statement	BOX	Hampshire	53 min
Jun 29, 7:54 PM EDT	Special Weather Statement	BOX	Worcester	51 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.