Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 48, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 6, 2021, 4:51 PM EDT for 4 counties in Massachusetts. It was in force for 33 min. 3 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
- Jul 6, 2021, 4:51 PM EDT (20:51 UTC)
- Expired
- Jul 6, 2021, 5:24 PM EDT
- In force
- 33 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Franklin County, MA, Hampden County, MA, Hampshire County, MA, Worcester County, MA
The radar
The Albany radar (KENX), 102 km from the middle of the area, began a volume at 20:55 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, 5:07 PM EDT | TSTM WND DMG | Belchertown, MA | TREE DOWN ON WIRES ON HOWARD STREET |
| Jul 6, 5:23 PM EDT | TSTM WND DMG | Russell, MA | TREE AND WIRES DOWN ON RTE 23 AT RTE 20 |
| Jul 6, 5:28 PM EDT | TSTM WND DMG | Huntington, MA | TREE AND WIRES DOWN BROMLEY 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, 8.9 hours before the alert went out and 89 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.
658
WUUS51 KBOX 062051
SVRBOX
MAC011-013-015-027-062145-
/O.NEW.KBOX.SV.W.0048.210706T2051Z-210706T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
451 PM EDT Tue Jul 6 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Western Worcester County in central Massachusetts...
Southern Hampshire County in western Massachusetts...
Southeastern Franklin County in western Massachusetts...
Central Hampden County in western Massachusetts...
* Until 545 PM EDT.
* At 451 PM EDT, a severe thunderstorm was located near Chester, or
15 miles northwest of Westfield, moving east at 30 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...
Springfield, Chicopee, Westfield, Holyoke, Amherst, Northampton,
West Springfield, Ludlow, South Hadley, Easthampton, Belchertown,
Wilbraham, Palmer, Ware, Monson, Granby, Southampton, Hadley,
Hardwick and Huntington.
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 4238 7307 4239 7305 4238 7301 4239 7301
4233 7247 4232 7225 4211 7230 4217 7303
4225 7300 4231 7300 4231 7303 4233 7306
TIME...MOT...LOC 2051Z 278DEG 27KT 4226 7301
HAIL...1.00IN
WIND...60MPH
$$
Loconto3 follow-up statements
819
WWUS51 KBOX 062053 RRA
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
453 PM EDT Tue Jul 6 2021
MAC011-013-015-027-062145-
/O.CON.KBOX.SV.W.0048.000000T0000Z-210706T2145Z/
Worcester MA-Hampshire MA-Franklin MA-Hampden MA-
453 PM EDT Tue Jul 6 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR WESTERN WORCESTER...SOUTHERN HAMPSHIRE...SOUTHEASTERN FRANKLIN
AND CENTRAL HAMPDEN COUNTIES...
At 453 PM EDT, a severe thunderstorm was located over Chester, or 14
miles northwest of Westfield, moving east at 30 mph.
This is a dangerous storm.
HAZARD...70 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable damage to trees and power lines. Wind
damage is also likely to mobile homes, roofs, and
outbuildings. Minor hail damage to vehicles is possible.
Locations impacted include...
Springfield, Chicopee, Westfield, Holyoke, Amherst, Northampton, West
Springfield, Ludlow, South Hadley, Easthampton, Belchertown,
Wilbraham, Palmer, Ware, Monson, Granby, Southampton, Hadley,
Hardwick and Huntington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4238 7307 4239 7305 4238 7301 4239 7301
4233 7247 4232 7225 4211 7230 4217 7303
4225 7300 4231 7300 4231 7303 4233 7306
TIME...MOT...LOC 2053Z 278DEG 27KT 4226 7299
HAIL...1.25IN
WIND...70MPH
$$
Loconto597
WWUS51 KBOX 062114
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
514 PM EDT Tue Jul 6 2021
MAC011-013-015-027-062145-
/O.CON.KBOX.SV.W.0048.000000T0000Z-210706T2145Z/
Worcester MA-Hampshire MA-Franklin MA-Hampden MA-
514 PM EDT Tue Jul 6 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR WESTERN WORCESTER...SOUTHERN HAMPSHIRE...SOUTHEASTERN FRANKLIN
AND CENTRAL HAMPDEN COUNTIES...
At 513 PM EDT, a severe thunderstorm was located over Southampton, or
near Westfield, 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, West
Springfield, Ludlow, South Hadley, Easthampton, Belchertown,
Wilbraham, Palmer, Ware, Monson, Granby, Southampton, Hadley,
Hardwick and Huntington.
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 4231 7286 4233 7247 4232 7225 4211 7230
4217 7303 4225 7300 4231 7300 4232 7294
TIME...MOT...LOC 2113Z 278DEG 27KT 4224 7278
HAIL...<.75IN
WIND...60MPH
$$
Loconto771
WWUS51 KBOX 062124
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
524 PM EDT Tue Jul 6 2021
MAC011-013-015-027-062134-
/O.CAN.KBOX.SV.W.0048.000000T0000Z-210706T2145Z/
Worcester MA-Hampshire MA-Franklin MA-Hampden MA-
524 PM EDT Tue Jul 6 2021
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN WORCESTER...SOUTHERN
HAMPSHIRE...SOUTHEASTERN FRANKLIN AND CENTRAL HAMPDEN COUNTIES IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However gusty winds and
heavy rain are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
western and central Massachusetts.
LAT...LON 4231 7286 4233 7247 4232 7225 4211 7230
4217 7303 4225 7300 4231 7300 4232 7294
TIME...MOT...LOC 2118Z 278DEG 27KT 4223 7267
$$
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, 3:12 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire | 63 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, 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.