Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 97, NWS Boston/Norton, MA

August 12, 2021Franklin County, Hampden County, Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 12, 2021, 5:02 PM EDT for Franklin County, Hampden County, Hampshire County, Massachusetts. It was in force for 58 min. 9 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 12, 2021, 5:02 PM EDT (21:02 UTC)
Expired: Aug 12, 2021, 6:00 PM EDT
In force: 58 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Franklin County, MA, Hampden County, MA, Hampshire County, MA

The radar

The Albany radar (KENX), 103 km from the middle of the area, began a volume at 21:05 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 12, 5:23 PM EDT	TSTM WND DMG	Huntington, MA	UTLIITY POLE DOWN AND WIRES DOWN ON UNOCCUPIED CAR ON UPPER RUSSELL ROAD
Aug 12, 5:27 PM EDT	TSTM WND DMG	Westfield, MA	MULTIPLE TREES DOWN BLOCKING A PORTION OF RTE 202
Aug 12, 5:27 PM EDT	TSTM WND GST 68	Westfield-Barnes Ap, MA
Aug 12, 5:30 PM EDT	TSTM WND DMG	Russell, MA	TREE DOWN ON RTE 23 AT RTE 20 INTERSECTION
Aug 12, 5:33 PM EDT	TSTM WND DMG	Holyoke, MA	TREE AND WIRES DOWN ON BUILDING AND CAR ON WILSON AVE
Aug 12, 5:35 PM EDT	TSTM WND DMG	Easthampton, MA	TREE AND WIRES DOWN ON NORTHHAMPTON STREET
Aug 12, 5:37 PM EDT	TSTM WND DMG	Granby, MA	MULTIPLE TREES DOWN ON RTE 202
Aug 12, 5:37 PM EDT	TSTM WND GST 58	Westover Afb, MA
Aug 12, 5:50 PM EDT	TSTM WND DMG	Chicopee, MA	TREE DOWN ON HOME ON CRESCENT DRIVE

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 91 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: 58 J/kg
Mixed-layer CIN: -212 J/kg
Mixed-layer LCL: 1178 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

668 
WUUS51 KBOX 122102
SVRBOX
MAC011-013-015-122200-
/O.NEW.KBOX.SV.W.0097.210812T2102Z-210812T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
502 PM EDT Thu Aug 12 2021

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Hampshire County in western Massachusetts...
  Southeastern Franklin County in western Massachusetts...
  Central Hampden County in western Massachusetts...

* Until 600 PM EDT.

* At 502 PM EDT, a severe thunderstorm was located near Middlefield,
  or 16 miles southeast of Pittsfield, 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, Westfield, Holyoke, Amherst, Northampton,
  Agawam, West Springfield, Ludlow, South Hadley, Easthampton, East
  Longmeadow, Belchertown, Wilbraham, Palmer, Ware, Monson, Granby,
  Southampton and Hadley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4215 7303 4227 7300 4231 7300 4231 7303
      4232 7305 4249 7293 4237 7231 4206 7236
      4214 7307 4215 7307
TIME...MOT...LOC 2102Z 283DEG 28KT 4232 7300 

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

$$

Nash

1 follow-up statement

533 
WWUS51 KBOX 122127
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
527 PM EDT Thu Aug 12 2021

MAC011-013-015-122200-
/O.CON.KBOX.SV.W.0097.000000T0000Z-210812T2200Z/
Hampshire MA-Franklin MA-Hampden MA-
527 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR HAMPSHIRE...SOUTHEASTERN FRANKLIN AND CENTRAL HAMPDEN COUNTIES...

At 525 PM EDT, a severe thunderstorm was located over Westhampton, 
or near Northampton, moving east at 30 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable damage to trees and power lines. Damage 
         is likely to mobile homes and outbuildings.

Locations impacted include...
Springfield, Chicopee, Westfield, Holyoke, Amherst, Northampton,
Agawam, West Springfield, Ludlow, South Hadley, Easthampton, East
Longmeadow, Belchertown, Wilbraham, Palmer, Ware, Monson, Granby,
Southampton and Hadley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm has a history of producing wind damage. SEEK SHELTER NOW 
inside a sturdy structure and stay away from windows.

&&

LAT...LON 4215 7303 4226 7297 4246 7277 4237 7231
      4206 7236 4214 7307 4215 7307
TIME...MOT...LOC 2125Z 283DEG 28KT 4228 7276 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Nash

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 2:53 PM EDT	Heat Advisory	BOX	Barnstable, Bristol, Essex, Franklin, Hampden, Hampshire and 5 more	29 hr
Aug 12, 3:45 PM EDT	Special Weather Statement	BOX	Franklin, Hampshire	60 min
Aug 12, 4:45 PM EDT	Special Weather Statement	BOX	Franklin, Hampden, Hampshire	60 min
Aug 12, 5:35 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Worcester	55 min
Aug 12, 5:42 PM EDT	Special Weather Statement	BOX	Worcester	48 min
Aug 12, 5:51 PM EDT	Severe Thunderstorm Warning Considerable damage threat	BOX	Franklin, Hampden, Hampshire, Worcester	39 min
Aug 12, 6:13 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Hampden, Middlesex, Norfolk, Worcester	62 min
Aug 12, 6:52 PM EDT	Special Marine Warning	BOX		53 min
Aug 12, 7:14 PM EDT	Special Weather Statement	BOX	Bristol, Plymouth	61 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.