Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 5, NWS Boston/Norton, MA

May 26, 2021Hampden County, Massachusetts; Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 26, 2021, 7:05 PM EDT for Hampden County, Massachusetts; Capitol Planning Region, Connecticut. It was in force for 55 min. 1 report 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: May 26, 2021, 7:05 PM EDT (23:05 UTC)
Expired: May 26, 2021, 8:00 PM EDT
In force: 55 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

The radar

The Albany radar (KENX), 113 km from the middle of the area, began a volume at 23:04 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
May 26, 7:20 PM EDT	TSTM WND DMG	Springfield, MA	MULTIPLE TREES DOWN ON NORTH BRANCH PARKWAY

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
May 26, 3:56 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 11.1 hours before the alert went out and 104 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: 6 J/kg
Mixed-layer CIN: -291 J/kg
Mixed-layer LCL: 1196 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

967 
WUUS51 KBOX 262305
SVRBOX
CTC003-013-MAC013-270000-
/O.NEW.KBOX.SV.W.0005.210526T2305Z-210527T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
705 PM EDT Wed May 26 2021

The National Weather Service in Boston/Norton has issued a

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

* Until 800 PM EDT.

* At 704 PM EDT, a severe thunderstorm was located near Granville, or
  9 miles southwest of Westfield, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Springfield, Chicopee, Enfield, Westfield, Windsor, Agawam, West
  Springfield, Simsbury, Bloomfield, Longmeadow, Suffield, East
  Longmeadow, Ellington, Wilbraham, Windsor Locks, Stafford, Somers,
  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 4214 7306 4215 7303 4218 7303 4210 7232
      4188 7235 4190 7291 4197 7289 4197 7303
      4204 7301 4204 7305 4207 7307
TIME...MOT...LOC 2304Z 273DEG 25KT 4203 7288 

HAIL...<.75IN
WIND...60MPH
 
$$

Nocera

1 follow-up statement

094 
WWUS51 KBOX 262333
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
733 PM EDT Wed May 26 2021

CTC003-013-MAC013-270000-
/O.CON.KBOX.SV.W.0005.000000T0000Z-210527T0000Z/
Tolland CT-Hartford CT-Hampden MA-
733 PM EDT Wed May 26 2021

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

At 732 PM EDT, a severe thunderstorm was located near Longmeadow, or
near Agawam, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Trained weather spotters. At 7:20 PM multiple trees were 
         down on North Branch Parkway in Springfield, MA.

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

Locations impacted include...
Springfield, Chicopee, Enfield, Westfield, Windsor, Agawam, West
Springfield, Simsbury, Bloomfield, Longmeadow, Suffield, East
Longmeadow, Ellington, Wilbraham, Windsor Locks, Stafford, Somers,
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 4214 7306 4215 7303 4218 7303 4210 7232
      4188 7235 4190 7291 4197 7289 4197 7303
      4204 7301 4204 7305 4207 7307
TIME...MOT...LOC 2332Z 273DEG 25KT 4202 7262 

HAIL...<.75IN
WIND...60MPH
 
$$

Nocera

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 10:05 PM EDT	Small Craft Advisory	BOX		12 hr
May 26, 9:51 AM EDT	Small Craft Advisory	BOX		21 hr
May 26, 5:03 PM EDT	Special Weather Statement	BOX	Franklin	27 min
May 26, 5:30 PM EDT	Special Weather Statement	BOX	Franklin	45 min
May 26, 5:47 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	58 min
May 26, 6:13 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Middlesex, Worcester	62 min
May 26, 6:39 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	66 min
May 26, 7:15 PM EDT	Special Weather Statement	BOX	Essex, Middlesex	45 min
May 26, 7:21 PM EDT	Special Marine Warning	BOX		54 min
May 26, 7:45 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Worcester	60 min
May 26, 7:40 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	65 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.