Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 121, NWS Boston/Norton, MA

October 16, 2021Franklin County, Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Oct 16, 2021, 6:00 PM EDT for Franklin County, Hampshire County, Massachusetts. It was in force for 27 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: Oct 16, 2021, 6:00 PM EDT (22:00 UTC)
Expired: Oct 16, 2021, 6:27 PM EDT
In force: 27 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Franklin County, MA, Hampshire County, MA

The radar

The Albany radar (KENX), 99 km from the middle of the area, began a volume at 22:03 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.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 10.0 hours before the alert went out and 80 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: 50 J/kg
Mixed-layer CIN: -197 J/kg
Mixed-layer LCL: 735 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 279 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

801 
WUUS51 KBOX 162200
SVRBOX
MAC011-015-162245-
/O.NEW.KBOX.SV.W.0121.211016T2200Z-211016T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
600 PM EDT Sat Oct 16 2021

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Northwestern Hampshire County in western Massachusetts...
  Northwestern Franklin County in western Massachusetts...

* Until 645 PM EDT.

* At 559 PM EDT, a severe thunderstorm was located over Cheshire, or
  9 miles south of North Adams, moving northeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Greenfield, Monroe, Bernardston, Buckland, Shelburne, Ashfield,
  Colrain, Charlemont, Cummington, Leyden, Heath, Plainfield, Rowe
  and Hawley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4273 7263 4273 7261 4266 7255 4247 7299
      4266 7295 4267 7296 4266 7298 4267 7300
      4270 7295 4270 7302 4274 7302
TIME...MOT...LOC 2159Z 222DEG 36KT 4255 7311 

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

$$

Gaucher

2 follow-up statements

276 
WWUS51 KBOX 162223
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
623 PM EDT Sat Oct 16 2021

MAC011-015-162245-
/O.CON.KBOX.SV.W.0121.000000T0000Z-211016T2245Z/
Hampshire MA-Franklin MA-
623 PM EDT Sat Oct 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHWESTERN HAMPSHIRE AND NORTHWESTERN FRANKLIN COUNTIES...

At 622 PM EDT, a severe thunderstorm was located over Rowe, or 11
miles east of North Adams, moving northeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Monroe, Buckland, Shelburne, Ashfield, Colrain, Charlemont, Leyden,
Heath, Plainfield, Rowe and Hawley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4273 7263 4273 7261 4262 7264 4261 7266
      4249 7298 4266 7295 4267 7296 4266 7298
      4267 7300 4270 7295 4270 7302 4274 7302
TIME...MOT...LOC 2222Z 222DEG 36KT 4273 7289 

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

$$

Gaucher

207 
WWUS51 KBOX 162227
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
627 PM EDT Sat Oct 16 2021

MAC011-015-162237-
/O.CAN.KBOX.SV.W.0121.000000T0000Z-211016T2245Z/
Hampshire MA-Franklin MA-
627 PM EDT Sat Oct 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN HAMPSHIRE AND
NORTHWESTERN FRANKLIN 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.

LAT...LON 4273 7263 4273 7261 4262 7264 4261 7266
      4249 7298 4266 7295 4267 7296 4266 7298
      4267 7300 4270 7295 4270 7302 4274 7302
TIME...MOT...LOC 2225Z 222DEG 36KT 4277 7284 

$$

Gaucher

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 16, 5:53 PM EDT	Special Weather Statement	BOX	Hampshire	37 min
Oct 16, 6:48 PM EDT	Special Weather Statement	BOX	Franklin	42 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.