Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 30, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 30, 2021, 4:39 PM EDT for 4 counties in Massachusetts. It was in force for 66 min. 2 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
- Jun 30, 2021, 4:39 PM EDT (20:39 UTC)
- Expired
- Jun 30, 2021, 5:45 PM EDT
- In force
- 66 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 Boston radar (KBOX), 120 km from the middle of the area, began a volume at 20:40 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 |
|---|---|---|---|
| Jun 30, 5:25 PM EDT | TSTM WND DMG | Barre, MA | TREE DOWN BLOCKING ROAD AT OLD COLD BROOK ROAD AT WALNUT HILL ROAD |
| Jun 30, 5:30 PM EDT | TSTM WND DMG | Oakham, MA | LARGE TREE DOWN NORTH BROOKFIELD 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 |
|---|---|---|---|
| Jun 30, 3:21 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 8.7 hours before the alert went out and 116 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
- 113 J/kg
- Mixed-layer CIN
- -257 J/kg
- Mixed-layer LCL
- 1162 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
006
WUUS51 KBOX 302039
SVRBOX
MAC011-013-015-027-302145-
/O.NEW.KBOX.SV.W.0030.210630T2039Z-210630T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
439 PM EDT Wed Jun 30 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Southwestern Worcester County in central Massachusetts...
Hampshire County in western Massachusetts...
Southeastern Franklin County in western Massachusetts...
Northeastern Hampden County in western Massachusetts...
* Until 545 PM EDT.
* At 439 PM EDT, a severe thunderstorm was located over Northampton,
moving east at 25 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...
Chicopee, Holyoke, Amherst, Northampton, Deerfield, Ludlow, South
Hadley, Easthampton, Belchertown, Wilbraham, Charlton, Palmer,
Spencer, Ware, Sturbridge, Rutland, Granby, Southampton, Barre and
Hadley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4225 7287 4251 7282 4244 7198 4211 7202
TIME...MOT...LOC 2039Z 278DEG 20KT 4234 7266
HAIL...1.00IN
WIND...60MPH
$$
Frank4 follow-up statements
396 WWUS51 KBOX 302054 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 454 PM EDT Wed Jun 30 2021 MAC011-013-015-027-302145- /O.CON.KBOX.SV.W.0030.000000T0000Z-210630T2145Z/ Worcester MA-Hampshire MA-Franklin MA-Hampden MA- 454 PM EDT Wed Jun 30 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT FOR WEST CENTRAL WORCESTER...SOUTHEASTERN HAMPSHIRE...SOUTHEASTERN FRANKLIN AND NORTHEASTERN HAMPDEN COUNTIES... At 454 PM EDT, a severe thunderstorm was located over Hadley, or near Amherst, moving east at 25 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. Locations impacted include... Holyoke, Amherst, Northampton, Deerfield, South Hadley, Easthampton, Belchertown, Palmer, Spencer, Ware, Rutland, Granby, Southampton, Barre, Hadley, Warren, North Brookfield, Hubbardston, West Brookfield and Sunderland. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4226 7273 4249 7268 4244 7198 4220 7202 TIME...MOT...LOC 2054Z 278DEG 20KT 4233 7255 HAIL...<.75IN WIND...60MPH $$ Frank
704
WWUS51 KBOX 302106
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
506 PM EDT Wed Jun 30 2021
MAC013-302116-
/O.CAN.KBOX.SV.W.0030.000000T0000Z-210630T2145Z/
Hampden MA-
506 PM EDT Wed Jun 30 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HAMPDEN COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
western and central Massachusetts.
LAT...LON 4228 7258 4248 7258 4244 7198 4224 7202
TIME...MOT...LOC 2106Z 270DEG 32KT 4234 7232
$$
MAC011-015-027-302145-
/O.CON.KBOX.SV.W.0030.000000T0000Z-210630T2145Z/
Worcester MA-Hampshire MA-Franklin MA-
506 PM EDT Wed Jun 30 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR WEST CENTRAL WORCESTER...SOUTHEASTERN HAMPSHIRE AND SOUTHEASTERN
FRANKLIN COUNTIES...
At 506 PM EDT, a severe thunderstorm was located near Ware, or 9
miles east of Amherst, moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Amherst, South Hadley, Belchertown, Spencer, Ware, Rutland, Granby,
Barre, Hadley, North Brookfield, Hubbardston, West Brookfield,
Sunderland, Hatfield, Hardwick, East Brookfield, Oakham, Leverett,
Shutesbury and Pelham.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4228 7258 4248 7258 4244 7198 4224 7202
TIME...MOT...LOC 2106Z 270DEG 32KT 4234 7232
HAIL...<.75IN
WIND...60MPH
$$
Frank320 WWUS51 KBOX 302120 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 520 PM EDT Wed Jun 30 2021 MAC011-015-027-302145- /O.CON.KBOX.SV.W.0030.000000T0000Z-210630T2145Z/ Worcester MA-Hampshire MA-Franklin MA- 520 PM EDT Wed Jun 30 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT FOR WEST CENTRAL WORCESTER...EAST CENTRAL HAMPSHIRE AND SOUTHEASTERN FRANKLIN COUNTIES... At 520 PM EDT, a severe thunderstorm was located over Hardwick, or 15 miles east of Amherst, moving east at 25 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. Locations impacted include... Belchertown, Spencer, Ware, Rutland, Barre, North Brookfield, Hubbardston, West Brookfield, Hardwick, East Brookfield, Oakham, Shutesbury, Pelham, Petersham, New Braintree and New Salem. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4227 7240 4247 7239 4244 7198 4224 7202 TIME...MOT...LOC 2120Z 278DEG 20KT 4233 7221 HAIL...<.75IN WIND...60MPH $$ Frank
613
WWUS51 KBOX 302140
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
540 PM EDT Wed Jun 30 2021
MAC011-015-027-302150-
/O.EXP.KBOX.SV.W.0030.000000T0000Z-210630T2145Z/
Worcester MA-Hampshire MA-Franklin MA-
540 PM EDT Wed Jun 30 2021
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL WORCESTER...EAST
CENTRAL HAMPSHIRE AND SOUTHEASTERN FRANKLIN COUNTIES WILL EXPIRE AT
545 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
western and central Massachusetts.
LAT...LON 4227 7240 4247 7239 4244 7198 4224 7202
TIME...MOT...LOC 2140Z 278DEG 20KT 4232 7208
$$
FrankThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 2:29 AM EDT | Small Craft Advisory | BOX | 18 hr | |
| Jun 30, 3:40 PM EDT | Special Weather Statement | BOX | Hampshire | 65 min |
| Jun 30, 3:42 PM EDT | Special Weather Statement | BOX | Franklin | 63 min |
| Jun 30, 3:48 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire | 57 min |
| Jun 30, 4:03 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire | 57 min |
| Jun 30, 4:32 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Middlesex, Worcester | 58 min |
| Jun 30, 4:45 PM EDT | Tornado Warning | BOX | Franklin, Worcester | 26 min |
| Jun 30, 5:00 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 30 min |
| Jun 30, 5:13 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 62 min |
| Jun 30, 5:25 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex | 49 min |
| Jun 30, 5:26 PM EDT | Special Marine Warning | BOX | 64 min | |
| Jun 30, 5:29 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 44 min |
| Jun 30, 5:43 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex | 51 min |
| Jun 30, 5:54 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Suffolk, Worcester | 53 min |
| Jun 30, 5:58 PM EDT | Special Marine Warning | BOX | 62 min | |
| Jun 30, 6:11 PM EDT | Special Weather Statement | BOX | Norfolk | 49 min |
| Jun 30, 6:12 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Plymouth, Suffolk, Worcester | 47 min |
| Jun 30, 6:22 PM EDT | Special Marine Warning | BOX | 53 min | |
| Jun 30, 6:31 PM EDT | Special Marine Warning | BOX | 59 min | |
| Jun 30, 6:45 PM EDT | Severe Thunderstorm Warning | BOX | Hampden | 60 min |
| Jun 30, 6:57 PM EDT | Special Marine Warning | BOX | 33 min | |
| Jun 30, 7:15 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Worcester | 60 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.