Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 113, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 16, 2021, 6:38 AM EDT for Bristol County, Plymouth County, Massachusetts; Bristol County, Newport County, Rhode Island. It was in force for 53 min. 1 report 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
- Sep 16, 2021, 6:38 AM EDT (10:38 UTC)
- Expired
- Sep 16, 2021, 7:31 AM EDT
- In force
- 53 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Bristol County, MA, Plymouth County, MA, Bristol County, RI, Newport County, RI
The radar
The Boston radar (KBOX), 37 km from the middle of the area, began a volume at 10:40 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 |
|---|---|---|---|
| Sep 16, 7:00 AM EDT | TSTM WND DMG | Westport, MA | TREE AND WIRES DOWN ON HORSENECK ROAD. |
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 00:00Z, 10.6 hours before the alert went out and 170 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.
877
WUUS51 KBOX 161038
SVRBOX
MAC005-023-RIC001-005-161145-
/O.NEW.KBOX.SV.W.0113.210916T1038Z-210916T1145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
638 AM EDT Thu Sep 16 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Southwestern Plymouth County in southeastern Massachusetts...
Southeastern Bristol County in southeastern Massachusetts...
Newport County in Rhode Island...
Southeastern Bristol County in Rhode Island...
* Until 745 AM EDT.
* At 638 AM EDT, a severe thunderstorm was located over Tiverton, or
near Bristol, 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...
New Bedford, Fall River, Dartmouth, Newport, Bristol, Marion,
Middleborough, Wareham, Somerset, Portsmouth, Middletown,
Fairhaven, Tiverton, Westport, Carver, Lakeville, Acushnet,
Freetown, Mattapoisett and Rochester.
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 4146 7133 4159 7128 4158 7134 4163 7134
4160 7129 4166 7127 4168 7124 4164 7121
4172 7117 4192 7082 4173 7068 4171 7077
4165 7076 4165 7092 4159 7090 4161 7093
4158 7093 4149 7120 4164 7123 4148 7124
TIME...MOT...LOC 1038Z 240DEG 19KT 4160 7121
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Loconto2 follow-up statements
888
WWUS51 KBOX 161103
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
703 AM EDT Thu Sep 16 2021
RIC001-161113-
/O.CAN.KBOX.SV.W.0113.000000T0000Z-210916T1145Z/
Bristol RI-
703 AM EDT Thu Sep 16 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BRISTOL COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4151 7113 4166 7120 4167 7119 4183 7075
4173 7068 4171 7077 4165 7076 4165 7092
4159 7090 4161 7093 4158 7093
TIME...MOT...LOC 1103Z 249DEG 20KT 4162 7098
$$
MAC005-023-RIC005-161145-
/O.CON.KBOX.SV.W.0113.000000T0000Z-210916T1145Z/
Plymouth MA-Bristol MA-Newport RI-
703 AM EDT Thu Sep 16 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM EDT
FOR SOUTH CENTRAL PLYMOUTH...SOUTHEASTERN BRISTOL AND NORTHEASTERN
NEWPORT COUNTIES...
At 703 AM EDT, a severe thunderstorm was located near Dartmouth,
moving east at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
New Bedford, Fall River, Dartmouth, Marion, Middleborough, Wareham,
Fairhaven, Tiverton, Westport, Carver, Acushnet, Freetown,
Mattapoisett, Rochester and Little Compton.
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 4151 7113 4166 7120 4167 7119 4183 7075
4173 7068 4171 7077 4165 7076 4165 7092
4159 7090 4161 7093 4158 7093
TIME...MOT...LOC 1103Z 249DEG 20KT 4162 7098
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Loconto971
WWUS51 KBOX 161131
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
731 AM EDT Thu Sep 16 2021
MAC005-023-RIC005-161141-
/O.CAN.KBOX.SV.W.0113.000000T0000Z-210916T1145Z/
Plymouth MA-Bristol MA-Newport RI-
731 AM EDT Thu Sep 16 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL PLYMOUTH...
SOUTHEASTERN BRISTOL AND NORTHEASTERN NEWPORT COUNTIES IS
CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.
LAT...LON 4151 7113 4166 7120 4167 7119 4183 7075
4173 7068 4171 7077 4165 7076 4165 7092
4159 7090 4161 7093 4158 7093
TIME...MOT...LOC 1124Z 240DEG 19KT 4170 7081
$$
LocontoThe 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, 6:42 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, 7:36 AM EDT | Severe Thunderstorm Warning | BOX | Barnstable, Dukes | 54 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 | |
| Sep 16, 5:15 AM EDT | Special Weather Statement | BOX | Providence | 60 min |
| Sep 16, 6:35 AM EDT | Special Weather Statement | BOX | Washington | 55 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.