Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 130, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Dec 11, 2021, 9:53 PM EST for 4 counties in Massachusetts. It was in force for 52 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
- Dec 11, 2021, 9:53 PM EST (02:53 UTC)
- Expired
- Dec 11, 2021, 10:45 PM EST
- In force
- 52 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, Worcester County, MA
The radar
The Albany radar (KENX), 100 km from the middle of the area, began a volume at 02:54 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 00:00Z, 2.9 hours before the alert went out and 87 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 956 m above ground
- 0-6 km bulk shear
- 95 kt
- 0-1 km storm-relative helicity
- 405 m²/s²
- 0-3 km storm-relative helicity
- 481 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
322
WUUS51 KBOX 120253
SVRBOX
MAC011-013-015-027-120345-
/O.NEW.KBOX.SV.W.0130.211212T0253Z-211212T0345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
953 PM EST Sat Dec 11 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Northwestern Worcester County in central Massachusetts...
Hampshire County in western Massachusetts...
Franklin County in western Massachusetts...
Hampden County in western Massachusetts...
* Until 1045 PM EST.
* At 952 PM EST, a line of intense showers capable of producing
damaging winds extended from 6 miles east of Bennington Vermont to
near Copake New York, moving east at 60 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated. These storms have a history of producing
wind damage north of Troy, New York.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Springfield, Chicopee, Westfield, Holyoke, Amherst, Northampton,
Agawam, West Springfield, Greenfield, Orange, Deerfield, Ludlow,
South Hadley, Easthampton, Longmeadow, East Longmeadow,
Belchertown, Wilbraham, Monroe and Palmer.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4215 7307 4214 7305 4215 7303 4230 7300
4233 7306 4238 7307 4239 7301 4266 7295
4267 7300 4270 7295 4270 7302 4274 7302
4271 7208 4203 7236 4204 7275 4202 7275
4202 7281 4204 7282 4204 7306
TIME...MOT...LOC 0252Z 263DEG 51KT 4285 7307 4207 7351
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Loconto2 follow-up statements
171
WWUS51 KBOX 120332
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
1032 PM EST Sat Dec 11 2021
MAC011-013-015-027-120345-
/O.CON.KBOX.SV.W.0130.000000T0000Z-211212T0345Z/
Worcester MA-Hampshire MA-Franklin MA-Hampden MA-
1032 PM EST Sat Dec 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EST
FOR NORTHWESTERN WORCESTER...HAMPSHIRE...FRANKLIN AND HAMPDEN
COUNTIES...
At 1030 PM EST, a line of intense showers capable of producing
damaging winds extended from Chesterfield to near Granville, moving
east at 60 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated. Several trees and power lines were downed
in the town of Cheshire in Berkshire County as these
intense showers moved through.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Springfield, Chicopee, Westfield, Holyoke, Amherst, Northampton,
Agawam, West Springfield, Greenfield, Orange, Deerfield, Ludlow,
South Hadley, Easthampton, Longmeadow, East Longmeadow, Belchertown,
Wilbraham, Palmer and Athol.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4215 7307 4214 7305 4215 7303 4230 7300
4233 7306 4238 7307 4239 7301 4256 7290
4264 7274 4273 7258 4271 7208 4203 7236
4204 7275 4202 7275 4202 7281 4204 7282
4204 7306
TIME...MOT...LOC 0330Z 263DEG 51KT 4290 7246 4213 7290
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Loconto168
WWUS51 KBOX 120344
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
1044 PM EST Sat Dec 11 2021
MAC011-013-015-027-120354-
/O.EXP.KBOX.SV.W.0130.000000T0000Z-211212T0345Z/
Worcester MA-Hampshire MA-Franklin MA-Hampden MA-
1044 PM EST Sat Dec 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WORCESTER...
HAMPSHIRE...FRANKLIN AND HAMPDEN COUNTIES WILL EXPIRE AT 1045 PM
EST...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible. A wind advisory remains in effect until 5
AM Sunday.
LAT...LON 4215 7307 4214 7305 4215 7303 4230 7300
4233 7306 4238 7307 4239 7301 4256 7290
4264 7274 4273 7258 4271 7208 4203 7236
4204 7275 4202 7275 4202 7281 4204 7282
4204 7306
TIME...MOT...LOC 0344Z 263DEG 51KT 4291 7235 4214 7279
$$
LocontoThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 12, 9:59 AM EST | Small Craft Advisory | BOX | 53 hr |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2021Every 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.