Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 14, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 8, 2021, 5:17 PM EDT for 4 counties in Massachusetts; Providence County, Rhode Island. It was in force for 58 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 8, 2021, 5:17 PM EDT (21:17 UTC)
- Expired
- Jun 8, 2021, 6:15 PM EDT
- In force
- 58 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bristol County, MA, Middlesex County, MA, Norfolk County, MA, Worcester County, MA, Providence County, RI
The radar
The Boston radar (KBOX), 32 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 |
|---|---|---|---|
| Jun 8, 5:40 PM EDT | TSTM WND DMG | Bellingham, MA | TREE DOWN ON TWO CARS AT NORTH ST |
| Jun 8, 5:45 PM EDT | TSTM WND DMG | Franklin, MA | POWER LINE DOWN ON LINCOLN ST |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 9.3 hours before the alert went out and 176 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
- 740 J/kg
- Mixed-layer CIN
- -106 J/kg
- Mixed-layer LCL
- 1004 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
489
WUUS51 KBOX 082117
SVRBOX
MAC005-017-021-027-RIC007-082215-
/O.NEW.KBOX.SV.W.0014.210608T2117Z-210608T2215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
517 PM EDT Tue Jun 8 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Southwestern Norfolk County in eastern Massachusetts...
Southeastern Worcester County in central Massachusetts...
South central Middlesex County in northeastern Massachusetts...
Northwestern Bristol County in southeastern Massachusetts...
North central Providence County in Rhode Island...
* Until 615 PM EDT.
* At 517 PM EDT, a severe thunderstorm was located over Millville, or
near Woonsocket, moving east at 20 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...
Woonsocket, Cumberland, Franklin, North Attleborough, Milford,
Walpole, Mansfield, Norton, Sharon, Foxborough, Bellingham,
Burrillville, Northbridge, Westwood, Holliston, Uxbridge, Medway,
Medfield, North Smithfield and Norfolk.
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 4198 7167 4213 7172 4225 7126 4200 7116
TIME...MOT...LOC 2117Z 257DEG 19KT 4205 7159
HAIL...1.00IN
WIND...60MPH
$$
Chai2 follow-up statements
978
WWUS51 KBOX 082140
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
540 PM EDT Tue Jun 8 2021
MAC005-017-021-027-RIC007-082215-
/O.CON.KBOX.SV.W.0014.000000T0000Z-210608T2215Z/
Norfolk MA-Worcester MA-Middlesex MA-Bristol MA-Providence RI-
540 PM EDT Tue Jun 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTHWESTERN NORFOLK...SOUTHEASTERN WORCESTER...SOUTH CENTRAL
MIDDLESEX...NORTHWESTERN BRISTOL AND NORTH CENTRAL PROVIDENCE
COUNTIES...
At 539 PM EDT, a severe thunderstorm was located over Franklin,
moving east at 20 mph. Up to 25 percent of customers without power
in Mendon and Bellingham, MA as of 530 PM EDT.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Woonsocket, Cumberland, Franklin, North Attleborough, Milford,
Walpole, Mansfield, Norton, Sharon, Foxborough, Bellingham, Westwood,
Holliston, Medway, Medfield, North Smithfield, Norfolk, Wrentham,
Blackstone and Plainville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4199 7154 4216 7159 4225 7126 4200 7116
TIME...MOT...LOC 2139Z 257DEG 19KT 4208 7144
HAIL...1.00IN
WIND...60MPH
$$
Chai357
WWUS51 KBOX 082150
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
550 PM EDT Tue Jun 8 2021
MAC027-RIC007-082159-
/O.CAN.KBOX.SV.W.0014.000000T0000Z-210608T2215Z/
Worcester MA-Providence RI-
550 PM EDT Tue Jun 8 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WORCESTER AND
NORTH CENTRAL PROVIDENCE COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4202 7142 4216 7148 4225 7126 4202 7117
TIME...MOT...LOC 2149Z 257DEG 19KT 4209 7137
$$
MAC005-017-021-082215-
/O.CON.KBOX.SV.W.0014.000000T0000Z-210608T2215Z/
Norfolk MA-Middlesex MA-Bristol MA-
550 PM EDT Tue Jun 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTHWESTERN NORFOLK...SOUTH CENTRAL MIDDLESEX AND NORTHWESTERN
BRISTOL COUNTIES...
At 549 PM EDT, a severe thunderstorm was located over Franklin,
moving east at 20 mph. Amateur radio reported tree down on cars in
Bellingham, MA at 540 PM EDT.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Franklin, Walpole, Mansfield, Sharon, Foxborough, Bellingham,
Westwood, Holliston, Medway, Medfield, Norfolk, Wrentham, Plainville,
Millis, Dover and Sherborn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4202 7142 4216 7148 4225 7126 4202 7117
TIME...MOT...LOC 2149Z 257DEG 19KT 4209 7137
HAIL...1.00IN
WIND...60MPH
$$
ChaiThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 12:35 PM EDT | Special Weather Statement | BOX | Hampshire | 40 min |
| Jun 8, 12:54 PM EDT | Flash Flood Watch | BOX | Franklin, Hampden, Hampshire, Middlesex, Worcester | 8 hr |
| Jun 8, 1:02 PM EDT | Flash Flood Warning | BOX | Hampshire | 55 min |
| Jun 8, 1:13 PM EDT | Special Weather Statement | BOX | Hampden | 47 min |
| Jun 8, 1:34 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Hampshire | 41 min |
| Jun 8, 1:39 PM EDT | Flash Flood Warning | BOX | Hampden, Hampshire | 67 min |
| Jun 8, 2:40 PM EDT | Special Weather Statement | BOX | Hampshire | 50 min |
| Jun 8, 2:56 PM EDT | Severe Thunderstorm Warning | BOX | Hampden | 43 min |
| Jun 8, 3:09 PM EDT | Special Weather Statement | BOX | Worcester | 51 min |
| Jun 8, 3:12 PM EDT | Special Weather Statement | BOX | Essex | 48 min |
| Jun 8, 3:32 PM EDT | Special Marine Warning | BOX | 43 min | |
| Jun 8, 3:37 PM EDT | Special Weather Statement | BOX | Hampshire | 38 min |
| Jun 8, 3:42 PM EDT | Special Weather Statement | BOX | Essex | 48 min |
| Jun 8, 3:51 PM EDT | Special Weather Statement | BOX | Hampshire | 39 min |
| Jun 8, 3:52 PM EDT | Special Marine Warning | BOX | 53 min | |
| Jun 8, 4:02 PM EDT | Special Weather Statement | BOX | Norfolk | 43 min |
| Jun 8, 4:04 PM EDT | Special Weather Statement | BOX | Hampshire | 41 min |
| Jun 8, 4:13 PM EDT | Special Weather Statement | BOX | Essex | 47 min |
| Jun 8, 4:38 PM EDT | Special Marine Warning | BOX | 52 min | |
| Jun 8, 5:33 PM EDT | Special Marine Warning | BOX | 42 min | |
| Jun 8, 5:59 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Norfolk, Plymouth, Suffolk | 35 min |
| Jun 8, 4:52 PM EDT | Special Weather Statement | BOX | Providence | 38 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2021Severe Thunderstorm Warnings in Rhode Island, 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.