Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 129, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Nov 13, 2021, 5:55 PM EST for 6 counties in Massachusetts. It was in force for 25 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
- Nov 13, 2021, 5:55 PM EST (22:55 UTC)
- Expired
- Nov 13, 2021, 6:20 PM EST
- In force
- 25 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Bristol County, MA, Essex County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA
The radar
The Boston radar (KBOX), 33 km from the middle of the area, began a volume at 22:58 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, 10.9 hours before the alert went out and 200 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1920 m above ground
- 0-6 km bulk shear
- 89 kt
- 0-1 km storm-relative helicity
- -52 m²/s²
- 0-3 km storm-relative helicity
- -148 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
547
WUUS51 KBOX 132255
SVRBOX
MAC005-009-017-021-023-025-140000-
/O.NEW.KBOX.SV.W.0129.211113T2255Z-211114T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
555 PM EST Sat Nov 13 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Suffolk County in eastern Massachusetts...
Northeastern Norfolk County in eastern Massachusetts...
Southern Essex County in northeastern Massachusetts...
Southeastern Middlesex County in northeastern Massachusetts...
Plymouth County in southeastern Massachusetts...
East central Bristol County in southeastern Massachusetts...
* Until 700 PM EST.
* At 555 PM EST, severe thunderstorms were located along a line
extending from Boston to Duxbury to Rochester, moving east at 50
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Boston, Cambridge, New Bedford, Brockton, Quincy, Lynn, Fall River,
Newton, Somerville, Malden, Brookline, Plymouth, Medford, Taunton,
Weymouth, Revere, Everett, Braintree, Chelsea and Randolph.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4246 7095 4236 7099 4236 7097 4230 7105
4225 7096 4225 7088 4229 7088 4226 7087
4226 7080 4202 7062 4202 7068 4201 7060
4201 7066 4200 7071 4193 7055 4185 7053
4180 7055 4171 7107 4205 7098 4237 7122
TIME...MOT...LOC 2255Z 264DEG 88KT 4233 7106 4204 7074 4178 7082
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Smith2 follow-up statements
196
WWUS51 KBOX 132314
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
614 PM EST Sat Nov 13 2021
MAC005-009-017-021-023-025-140000-
/O.CON.KBOX.SV.W.0129.000000T0000Z-211114T0000Z/
Suffolk MA-Norfolk MA-Essex MA-Middlesex MA-Plymouth MA-Bristol MA-
614 PM EST Sat Nov 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EST
FOR NORTH CENTRAL SUFFOLK...NORTHEASTERN NORFOLK...SOUTHERN ESSEX...
SOUTHEASTERN MIDDLESEX...PLYMOUTH AND EASTERN BRISTOL COUNTIES...
At 613 PM EST, severe thunderstorms were located along a line
extending from 16 miles northeast of Scituate to Provincetown to 7
miles northwest of Dennis, moving northeast at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Boston, Cambridge, Quincy, Lynn, Somerville, Malden, Plymouth,
Medford, Weymouth, Revere, Everett, Braintree, Chelsea, Saugus,
Marshfield, Middleborough, Hingham, Wareham, Scituate and Pembroke.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4246 7095 4236 7099 4236 7097 4231 7104
4225 7096 4225 7088 4229 7088 4226 7087
4226 7080 4202 7062 4202 7068 4201 7060
4201 7066 4200 7071 4193 7055 4185 7053
4180 7055 4175 7094 4210 7087 4240 7114
TIME...MOT...LOC 2313Z 270DEG 88KT 4235 7048 4206 7016 4180 7024
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Smith805
WWUS51 KBOX 132320
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
620 PM EST Sat Nov 13 2021
MAC005-009-017-021-023-025-132329-
/O.CAN.KBOX.SV.W.0129.000000T0000Z-211114T0000Z/
Suffolk MA-Norfolk MA-Essex MA-Middlesex MA-Plymouth MA-Bristol MA-
620 PM EST Sat Nov 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL SUFFOLK...
NORTHEASTERN NORFOLK...SOUTHERN ESSEX...SOUTHEASTERN MIDDLESEX...
PLYMOUTH AND EASTERN BRISTOL COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled.
LAT...LON 4246 7095 4236 7099 4236 7097 4231 7104
4225 7096 4225 7088 4229 7088 4226 7087
4226 7080 4202 7062 4202 7068 4201 7060
4201 7066 4200 7071 4193 7055 4185 7053
4180 7055 4175 7094 4210 7087 4240 7114
TIME...MOT...LOC 2319Z 264DEG 88KT 4237 7027 4208 6995 4182 7003
$$
SmithThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 12, 9:39 PM EST | Gale Warning | BOX | 29 hr | |
| Nov 13, 4:09 PM EST | Severe Thunderstorm Warning | BOX | Hampden | 15 min |
| Nov 13, 4:45 PM EST | Special Marine Warning | BOX | 60 min | |
| Nov 13, 5:01 PM EST | Severe Thunderstorm Warning | BOX | Worcester | 26 min |
| Nov 13, 5:08 PM EST | Tornado Warning | BOX | Bristol | 24 min |
| Nov 13, 5:12 PM EST | Severe Thunderstorm Warning | BOX | Bristol, Plymouth | 44 min |
| Nov 13, 5:17 PM EST | Severe Thunderstorm Warning | BOX | Bristol, Middlesex, Norfolk, Plymouth, Worcester | 7 min |
| Nov 13, 5:21 PM EST | Tornado Warning | BOX | Bristol, Norfolk | 24 min |
| Nov 13, 5:22 PM EST | Special Marine Warning | BOX | 53 min | |
| Nov 13, 5:26 PM EST | Severe Thunderstorm Warning | BOX | Bristol, Middlesex, Norfolk, Plymouth, Suffolk, Worcester | 32 min |
| Nov 13, 5:45 PM EST | Special Weather Statement | BOX | Bristol, Plymouth | 45 min |
| Nov 13, 5:45 PM EST | Severe Thunderstorm Warning | BOX | Barnstable, Dukes, Plymouth | 60 min |
| Nov 13, 5:47 PM EST | Tornado Warning | BOX | Dukes | 28 min |
| Nov 13, 6:02 PM EST | Special Marine Warning | BOX | 58 min | |
| Nov 13, 6:07 PM EST | Tornado Warning | BOX | Barnstable, Dukes | 23 min |
| Nov 13, 6:13 PM EST | Special Marine Warning | BOX | 92 min | |
| Nov 13, 6:27 PM EST | Tornado Warning | BOX | Barnstable | 15 min |
| Nov 13, 6:49 PM EST | Special Weather Statement | BOX | Barnstable | 41 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.