Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 21, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 22, 2021, 2:00 PM EDT for 4 counties in Massachusetts. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 22, 2021, 2:00 PM EDT (18:00 UTC)
- Expired
- Jun 22, 2021, 2:45 PM EDT
- In force
- 45 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bristol County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA
The radar
The Boston radar (KBOX), 34 km from the middle of the area, began a volume at 18:00 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.
The nearest sounding before it
Gray, ME (KGYX), launched 12:00Z, 6.0 hours before the alert went out and 193 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
- 47 J/kg
- Mixed-layer CIN
- -102 J/kg
- Mixed-layer LCL
- 851 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.0
The text
As transmitted.
815
WUUS51 KBOX 221800
SVRBOX
MAC005-021-023-025-221845-
/O.NEW.KBOX.SV.W.0021.210622T1800Z-210622T1845Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
200 PM EDT Tue Jun 22 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
South central Suffolk County in eastern Massachusetts...
Eastern Norfolk County in eastern Massachusetts...
Northwestern Plymouth County in southeastern Massachusetts...
Northwestern Bristol County in southeastern Massachusetts...
* Until 245 PM EDT.
* At 200 PM EDT, a severe thunderstorm was located near Norton, or
near North Attleborough, moving northeast at 55 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...
Boston, Brockton, Quincy, Taunton, Weymouth, Braintree, Randolph,
North Attleborough, Norwood, Milton, Stoughton, Attleboro, Dedham,
Mansfield, Easton, Hingham, Canton, Norton, Scituate and Sharon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4232 7105 4230 7105 4230 7100 4229 7102
4227 7099 4228 7095 4225 7096 4226 7091
4225 7088 4227 7088 4228 7090 4228 7088
4226 7086 4224 7077 4221 7073 4186 7125
4192 7136 4233 7108
TIME...MOT...LOC 1800Z 216DEG 47KT 4195 7124
HAIL...1.00IN
WIND...60MPH
$$
BW1 follow-up statement
089
WWUS51 KBOX 221817
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
217 PM EDT Tue Jun 22 2021
MAC005-021-023-025-221845-
/O.CON.KBOX.SV.W.0021.000000T0000Z-210622T1845Z/
Suffolk MA-Norfolk MA-Plymouth MA-Bristol MA-
217 PM EDT Tue Jun 22 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR SOUTHEASTERN SUFFOLK...EASTERN NORFOLK...NORTHWESTERN PLYMOUTH
AND NORTH CENTRAL BRISTOL COUNTIES...
At 217 PM EDT, a severe thunderstorm was located over Avon, or over
Stoughton, moving northeast at 55 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Boston, Brockton, Quincy, Taunton, Weymouth, Braintree, Randolph,
Milton, Stoughton, Mansfield, Easton, Hingham, Canton, Norton,
Scituate, Sharon, Rockland, Foxborough, Abington and Whitman.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4230 7100 4229 7102 4227 7099 4228 7095
4225 7096 4226 7091 4225 7088 4227 7088
4228 7090 4228 7088 4226 7086 4224 7077
4221 7073 4192 7116 4199 7124 4230 7105
TIME...MOT...LOC 1817Z 216DEG 47KT 4213 7106
HAIL...1.00IN
WIND...60MPH
$$
BWThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 10:50 PM EDT | Special Weather Statement | BOX | Franklin | 40 min |
| Jun 22, 3:38 AM EDT | Rip Current Statement | BOX | Dukes, Nantucket | 15 hr |
| Jun 22, 1:52 PM EDT | Severe Thunderstorm Warning | BOX | Bristol | 38 min |
| Jun 22, 2:14 PM EDT | Special Marine Warning | BOX | 31 min | |
| Jun 22, 2:33 PM EDT | Special Weather Statement | BOX | Plymouth | 42 min |
| Jun 22, 2:43 PM EDT | Special Weather Statement | BOX | Plymouth | 32 min |
| Jun 22, 3:06 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Plymouth | 23 min |
| Jun 22, 3:07 PM EDT | Special Marine Warning | BOX | 53 min | |
| Jun 22, 3:41 PM EDT | Special Marine Warning | BOX | 64 min | |
| Jun 22, 4:42 PM EDT | Special Weather Statement | BOX | Norfolk, Suffolk | 48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.