Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 115, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 16, 2021, 7:36 AM EDT for Barnstable County, Dukes County, Massachusetts. It was in force for 54 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
- Sep 16, 2021, 7:36 AM EDT (11:36 UTC)
- Expired
- Sep 16, 2021, 8:30 AM EDT
- In force
- 54 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Barnstable County, MA, Dukes County, MA
The radar
The Boston radar (KBOX), 69 km from the middle of the area, began a volume at 11:36 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, 11.6 hours before the alert went out and 191 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
- 664 J/kg
- Mixed-layer CIN
- -93 J/kg
- Mixed-layer LCL
- 1000 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 172 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.4
The text
As transmitted.
705
WUUS51 KBOX 161136
SVRBOX
MAC001-007-161230-
/O.NEW.KBOX.SV.W.0115.210916T1136Z-210916T1230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
736 AM EDT Thu Sep 16 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Dukes County in southeastern Massachusetts...
Southwestern Barnstable County in southeastern Massachusetts...
* Until 830 AM EDT.
* At 736 AM EDT, a severe thunderstorm was located 10 miles west of
Aquinnah, moving northeast at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Falmouth, Oak Bluffs, Edgartown, Tisbury, Aquinnah, West Tisbury,
Chilmark and Gosnold.
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 4125 7081 4132 7077 4142 7090 4145 7086
4138 7084 4135 7077 4143 7070 4147 7076
4145 7084 4152 7070 4146 7063 4153 7069
4159 7060 4155 7057 4152 7066 4148 7062
4147 7057 4141 7056 4135 7045 4134 7073
TIME...MOT...LOC 1136Z 243DEG 19KT 4129 7101
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Loconto1 follow-up statement
799
WWUS51 KBOX 161221
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
821 AM EDT Thu Sep 16 2021
MAC001-007-161230-
/O.EXP.KBOX.SV.W.0115.000000T0000Z-210916T1230Z/
Dukes MA-Barnstable MA-
821 AM EDT Thu Sep 16 2021
...THE SEVERE THUNDERSTORM WARNING FOR DUKES AND SOUTHWESTERN
BARNSTABLE COUNTIES WILL EXPIRE AT 830 AM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Boston/Norton.
LAT...LON 4125 7081 4132 7077 4142 7090 4145 7086
4138 7084 4135 7077 4143 7070 4147 7076
4145 7084 4152 7070 4146 7063 4153 7069
4159 7060 4155 7057 4152 7066 4148 7062
4147 7057 4141 7056 4135 7045 4134 7073
TIME...MOT...LOC 1220Z 243DEG 19KT 4140 7073
$$
FrankThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 5:43 AM EDT | Special Marine Warning | BOX | 62 min | |
| Sep 16, 6:10 AM EDT | Special Weather Statement | BOX | Essex, Norfolk | 65 min |
| Sep 16, 6:13 AM EDT | Special Weather Statement | BOX | Norfolk | 62 min |
| Sep 16, 6:24 AM EDT | Special Weather Statement | BOX | Bristol | 66 min |
| Sep 16, 6:38 AM EDT | Severe Thunderstorm Warning | BOX | Bristol, Plymouth | 53 min |
| Sep 16, 6:42 AM EDT | Special Marine Warning | BOX | 63 min | |
| Sep 16, 7:00 AM EDT | Special Marine Warning | BOX | 60 min | |
| Sep 16, 7:13 AM EDT | Severe Thunderstorm Warning | BOX | Barnstable, Bristol, Dukes, Plymouth | 62 min |
| Sep 16, 7:25 AM EDT | Special Marine Warning | BOX | 65 min | |
| Sep 16, 7:27 AM EDT | Special Marine Warning | BOX | 63 min | |
| Sep 16, 7:51 AM EDT | Special Marine Warning | BOX | 54 min | |
| Sep 16, 7:59 AM EDT | Special Weather Statement | BOX | Barnstable, Dukes | 61 min |
| Sep 16, 8:15 AM EDT | Special Marine Warning | BOX | 90 min | |
| Sep 16, 8:37 AM EDT | Special Marine Warning | BOX | 40 min | |
| Sep 16, 9:31 AM EDT | Special Marine Warning | BOX | 59 min | |
| Sep 16, 3:18 PM EDT | Small Craft Advisory | BOX | 3 days |
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.