Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 122, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Oct 31, 2021, 2:26 AM EDT for Barnstable County, Dukes County, Plymouth County, Massachusetts. It was in force for 31 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
- Oct 31, 2021, 2:26 AM EDT (06:26 UTC)
- Expired
- Oct 31, 2021, 2:57 AM EDT
- In force
- 31 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Barnstable County, MA, Dukes County, MA, Plymouth County, MA
The radar
The Boston radar (KBOX), 70 km from the middle of the area, began a volume at 06:28 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
Brookhaven, NY (KOKX), launched 00:00Z, 6.4 hours before the alert went out and 214 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
- 854 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
092
WUUS51 KBOX 310626
SVRBOX
MAC001-007-023-310715-
/O.NEW.KBOX.SV.W.0122.211031T0626Z-211031T0715Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
226 AM EDT Sun Oct 31 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Northeastern Dukes County in southeastern Massachusetts...
Southwestern Barnstable County in southeastern Massachusetts...
Southeastern Plymouth County in southeastern Massachusetts...
* Until 315 AM EDT.
* At 225 AM EDT, a severe thunderstorm was located 7 miles southeast
of Edgartown, moving north at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Barnstable, Falmouth, Oak Bluffs, Edgartown, Tisbury, Sandwich,
Bourne, Mashpee, West Tisbury and Hyannis.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4153 7068 4168 7062 4166 7065 4170 7067
4173 7028 4172 7027 4172 7030 4171 7026
4164 7028 4160 7047 4141 7045 4155 7051
4155 7052 4135 7045 4137 7046 4144 7050
4135 7050 4135 7061
TIME...MOT...LOC 0625Z 172DEG 39KT 4127 7042
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Chai1 follow-up statement
618
WWUS51 KBOX 310657
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
257 AM EDT Sun Oct 31 2021
MAC001-007-023-310707-
/O.CAN.KBOX.SV.W.0122.000000T0000Z-211031T0715Z/
Dukes MA-Barnstable MA-Plymouth MA-
257 AM EDT Sun Oct 31 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DUKES...
SOUTHWESTERN BARNSTABLE AND SOUTHEASTERN PLYMOUTH COUNTIES IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However heavy rain is
still possible with this thunderstorm.
LAT...LON 4153 7068 4168 7062 4166 7065 4170 7067
4173 7028 4172 7027 4172 7030 4171 7026
4164 7028 4160 7047 4141 7045 4155 7051
4155 7052 4135 7045 4137 7046 4144 7050
4135 7050 4135 7061
TIME...MOT...LOC 0655Z 172DEG 39KT 4162 7049
$$
ChaiThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 31, 2:01 AM EDT | Special Marine Warning | BOX | 59 min | |
| Oct 31, 2:13 AM EDT | Special Weather Statement | BOX | Dukes | 47 min |
| Oct 31, 3:11 AM EDT | Special Weather Statement | BOX | Plymouth | 64 min |
| Oct 31, 3:21 AM EDT | Areal Flood Warning | BOX | Bristol, Plymouth | 96 min |
| Oct 31, 3:34 AM EDT | Special Marine Warning | BOX | 56 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.