Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 58, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 7, 2021, 5:21 PM EDT for Hampden County, Hampshire County, Worcester County, Massachusetts. It was in force for 54 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 7, 2021, 5:21 PM EDT (21:21 UTC)
- Expired
- Jul 7, 2021, 6:15 PM EDT
- In force
- 54 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Hampden County, MA, Hampshire County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 87 km from the middle of the area, began a volume at 21:20 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 7, 5:50 PM EDT | TSTM WND DMG | West Brookfield, MA | TREES AND WIRES ON LONG HILL 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 7, 2:41 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 9.4 hours before the alert went out and 149 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
- 18 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 923 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
248
WUUS51 KBOX 072121
SVRBOX
MAC013-015-027-072215-
/O.NEW.KBOX.SV.W.0058.210707T2121Z-210707T2215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
521 PM EDT Wed Jul 7 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Southwestern Worcester County in central Massachusetts...
East central Hampshire County in western Massachusetts...
East central Hampden County in western Massachusetts...
* Until 615 PM EDT.
* At 521 PM EDT, a severe thunderstorm was located over West
Brookfield, or 18 miles southeast of Amherst, moving east at 15
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
* Locations impacted include...
Worcester, Holden, Auburn, Oxford, Charlton, Palmer, Spencer,
Leicester, Ware, Sturbridge, Rutland, Barre, Warren, Paxton, North
Brookfield, West Brookfield, Brimfield, Princeton, Brookfield and
Hardwick.
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 4216 7229 4237 7228 4244 7187 4210 7184
TIME...MOT...LOC 2121Z 274DEG 12KT 4225 7219
HAIL...1.00IN
WIND...60MPH
$$
Loconto3 follow-up statements
274
WWUS51 KBOX 072138
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
538 PM EDT Wed Jul 7 2021
MAC013-015-027-072215-
/O.CON.KBOX.SV.W.0058.000000T0000Z-210707T2215Z/
Worcester MA-Hampshire MA-Hampden MA-
538 PM EDT Wed Jul 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTHWESTERN WORCESTER...EASTERN HAMPSHIRE AND EAST CENTRAL
HAMPDEN COUNTIES...
At 538 PM EDT, a severe thunderstorm was located over West
Brookfield, or 15 miles west of Worcester, moving east at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Worcester, Holden, Auburn, Oxford, Charlton, Palmer, Spencer,
Leicester, Ware, Sturbridge, Rutland, Barre, Warren, Paxton, North
Brookfield, West Brookfield, Brimfield, Princeton, Brookfield and
Hardwick.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4216 7229 4238 7222 4244 7187 4210 7184
TIME...MOT...LOC 2138Z 274DEG 12KT 4225 7211
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
Loconto477 WWUS51 KBOX 072149 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 549 PM EDT Wed Jul 7 2021 MAC013-015-027-072215- /O.CON.KBOX.SV.W.0058.000000T0000Z-210707T2215Z/ Worcester MA-Hampshire MA-Hampden MA- 549 PM EDT Wed Jul 7 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT FOR SOUTHWESTERN WORCESTER...EASTERN HAMPSHIRE AND EAST CENTRAL HAMPDEN COUNTIES... At 548 PM EDT, a severe thunderstorm was located over North Brookfield, or 13 miles west of Worcester, moving east at 15 mph. HAZARD...60 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. Locations impacted include... Worcester, Holden, Auburn, Oxford, Charlton, Palmer, Spencer, Leicester, Ware, Sturbridge, Rutland, Warren, Paxton, North Brookfield, West Brookfield, Brimfield, Princeton, Brookfield, East Brookfield and Oakham. 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 4216 7229 4233 7217 4244 7187 4210 7184 TIME...MOT...LOC 2148Z 274DEG 12KT 4225 7206 HAIL...0.88IN WIND...60MPH $$ Loconto
834
WWUS51 KBOX 072213
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
613 PM EDT Wed Jul 7 2021
MAC013-015-027-072223-
/O.EXP.KBOX.SV.W.0058.000000T0000Z-210707T2215Z/
Worcester MA-Hampshire MA-Hampden MA-
613 PM EDT Wed Jul 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WORCESTER...
EASTERN HAMPSHIRE AND EAST CENTRAL HAMPDEN COUNTIES WILL EXPIRE AT
615 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
western and central Massachusetts.
LAT...LON 4216 7229 4233 7217 4244 7187 4210 7184
TIME...MOT...LOC 2213Z 274DEG 12KT 4225 7198
$$
LocontoThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 4:00 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Hampshire | 60 min |
| Jul 7, 4:01 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire | 59 min |
| Jul 7, 4:05 PM EDT | Special Weather Statement | BOX | Essex | 40 min |
| Jul 7, 4:33 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex | 57 min |
| Jul 7, 5:02 PM EDT | Special Weather Statement | BOX | Worcester | 43 min |
| Jul 7, 5:05 PM EDT | Special Marine Warning | BOX | 25 min | |
| Jul 7, 5:10 PM EDT | Tropical Storm Watch | BOX | Barnstable, Bristol, Dukes, Nantucket, Plymouth | 13 hr |
| Jul 7, 5:24 PM EDT | Special Marine Warning | BOX | 66 min | |
| Jul 7, 5:30 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Worcester | 60 min |
| Jul 7, 6:01 PM EDT | Special Weather Statement | BOX | Worcester | 44 min |
| Jul 7, 6:17 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Middlesex, Norfolk, Worcester | 58 min |
| Jul 7, 6:18 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 36 min |
| Jul 7, 6:22 PM EDT | Special Marine Warning | BOX | 53 min | |
| Jul 7, 6:59 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Middlesex, Norfolk, Plymouth, Suffolk | 61 min |
| Jul 7, 7:18 PM EDT | Special Marine Warning | BOX | 57 min | |
| Jul 7, 7:47 PM EDT | Severe Thunderstorm Warning | BOX | Norfolk, Plymouth | 25 min |
| Jul 7, 7:51 PM EDT | Special Marine Warning | BOX | 54 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.