Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 43, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 6, 2021, 3:12 PM EDT for Franklin County, Hampden County, Hampshire County, Massachusetts. It was in force for 63 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
- Jul 6, 2021, 3:12 PM EDT (19:12 UTC)
- Expired
- Jul 6, 2021, 4:15 PM EDT
- In force
- 63 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Franklin County, MA, Hampden County, MA, Hampshire County, MA
The radar
The Albany radar (KENX), 95 km from the middle of the area, began a volume at 19:15 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 |
|---|---|---|---|
| Jul 6, 4:05 PM EDT | TSTM WND DMG | Chesterfield, MA | TREE DOWN ON WIRES ON STAGE ROAD |
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 |
|---|---|---|---|
| Jul 6, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 7.2 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.
- Mixed-layer CAPE
- 326 J/kg
- Mixed-layer CIN
- -120 J/kg
- Mixed-layer LCL
- 941 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 182 m²/s²
- 0-3 km storm-relative helicity
- 202 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
369
WUUS51 KBOX 061912
SVRBOX
MAC011-013-015-062015-
/O.NEW.KBOX.SV.W.0043.210706T1912Z-210706T2015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
312 PM EDT Tue Jul 6 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Hampshire County in western Massachusetts...
Central Franklin County in western Massachusetts...
Northwestern Hampden County in western Massachusetts...
* Until 415 PM EDT.
* At 311 PM EDT, a severe thunderstorm was located near Cheshire, or
8 miles east of Pittsfield, moving east at 20 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Chicopee, Holyoke, Amherst, Northampton, Deerfield, South Hadley,
Easthampton, Montague, Granby, Southampton, Hadley, Sunderland,
Hatfield, Williamsburg, Huntington, Buckland, Conway, Shelburne,
Leverett and Shutesbury.
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 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 4239 7305 4238 7301 4252 7297 4256 7298
4258 7296 4255 7244 4216 7256 4227 7300
4231 7300 4231 7303 4233 7306 4238 7307
TIME...MOT...LOC 1911Z 278DEG 19KT 4250 7310
HAIL...0.88IN
WIND...60MPH
$$
Loconto2 follow-up statements
129
WWUS51 KBOX 061951
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
351 PM EDT Tue Jul 6 2021
MAC011-013-015-062015-
/O.CON.KBOX.SV.W.0043.000000T0000Z-210706T2015Z/
Hampshire MA-Franklin MA-Hampden MA-
351 PM EDT Tue Jul 6 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR HAMPSHIRE...CENTRAL FRANKLIN AND NORTHWESTERN HAMPDEN COUNTIES...
At 350 PM EDT, a severe thunderstorm was located over Goshen, or 12
miles northwest of Northampton, moving east at 20 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Chicopee, Holyoke, Amherst, Northampton, Deerfield, South Hadley,
Easthampton, Montague, Granby, Southampton, Hadley, Sunderland,
Hatfield, Williamsburg, Huntington, Buckland, Conway, Shelburne,
Leverett and Shutesbury.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4239 7305 4238 7301 4252 7297 4256 7298
4258 7296 4255 7244 4216 7256 4227 7300
4231 7300 4231 7303 4233 7306 4238 7307
TIME...MOT...LOC 1950Z 278DEG 19KT 4247 7282
HAIL...0.88IN
WIND...60MPH
$$
Loconto765
WWUS51 KBOX 062014
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
414 PM EDT Tue Jul 6 2021
MAC011-013-015-062024-
/O.EXP.KBOX.SV.W.0043.000000T0000Z-210706T2015Z/
Hampshire MA-Franklin MA-Hampden MA-
414 PM EDT Tue Jul 6 2021
...THE SEVERE THUNDERSTORM WARNING FOR HAMPSHIRE...CENTRAL FRANKLIN
AND NORTHWESTERN HAMPDEN COUNTIES WILL EXPIRE AT 415 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
western Massachusetts.
LAT...LON 4239 7305 4238 7301 4252 7297 4256 7298
4258 7296 4255 7244 4216 7256 4227 7300
4231 7300 4231 7303 4233 7306 4238 7307
TIME...MOT...LOC 2014Z 278DEG 19KT 4246 7271
$$
LocontoThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 1:42 AM EDT | Special Weather Statement | BOX | Franklin | 33 min |
| Jul 6, 1:57 AM EDT | Special Weather Statement | BOX | Franklin | 33 min |
| Jul 6, 2:20 AM EDT | Special Weather Statement | BOX | Franklin | 25 min |
| Jul 6, 2:34 AM EDT | Special Weather Statement | BOX | Worcester | 41 min |
| Jul 6, 3:33 AM EDT | Heat Advisory | BOX | Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex and 4 more | 39 hr |
| Jul 6, 2:14 PM EDT | Special Weather Statement | BOX | Franklin | 46 min |
| Jul 6, 3:02 PM EDT | Special Weather Statement | BOX | Hampshire | 43 min |
| Jul 6, 3:06 PM EDT | Special Weather Statement | BOX | Hampden | 39 min |
| Jul 6, 3:36 PM EDT | Special Weather Statement | BOX | Hampden | 39 min |
| Jul 6, 3:49 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 56 min |
| Jul 6, 4:13 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 40 min |
| Jul 6, 4:20 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Hampshire | 55 min |
| Jul 6, 4:42 PM EDT | Special Weather Statement | BOX | Middlesex, Worcester | 48 min |
| Jul 6, 4:43 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 62 min |
| Jul 6, 4:51 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 33 min |
| Jul 6, 5:13 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex, Suffolk, Worcester | 62 min |
| Jul 6, 5:16 PM EDT | Special Marine Warning | BOX | 44 min | |
| Jul 6, 5:19 PM EDT | Special Weather Statement | BOX | Essex | 41 min |
| Jul 6, 5:21 PM EDT | Special Marine Warning | BOX | 39 min | |
| Jul 6, 5:21 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Worcester | 42 min |
| Jul 6, 5:52 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Middlesex, Norfolk, Worcester | 53 min |
| Jul 6, 5:54 PM EDT | Special Marine Warning | BOX | 66 min | |
| Jul 6, 5:57 PM EDT | Special Marine Warning | BOX | 48 min | |
| Jul 6, 6:00 PM EDT | Special Weather Statement | BOX | Essex | 30 min |
| Jul 6, 6:07 PM EDT | Special Marine Warning | BOX | 23 min | |
| Jul 6, 6:13 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Middlesex, Norfolk, Plymouth, Suffolk | 31 min |
| Jul 6, 6:37 PM EDT | Special Marine Warning | BOX | 23 min | |
| Jul 6, 6:45 PM EDT | Special Weather Statement | BOX | Bristol, Plymouth | 45 min |
| Jul 6, 6:52 PM EDT | Special Marine Warning | BOX | 53 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.