Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 120, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 28, 2021, 2:07 PM EDT for Bristol County, Newport County, Washington County, Rhode Island; 4 counties in Massachusetts. It was in force for 53 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 28, 2021, 2:07 PM EDT (18:07 UTC)
- Expired
- Sep 28, 2021, 3:00 PM EDT
- In force
- 53 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Barnstable County, MA, Bristol County, MA, Dukes County, MA, Plymouth County, MA, Bristol County, RI, Newport County, RI, Washington County, RI
The radar
The Boston radar (KBOX), 46 km from the middle of the area, began a volume at 18:09 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 12:00Z, 6.1 hours before the alert went out and 173 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
- 116 J/kg
- Mixed-layer CIN
- -338 J/kg
- Mixed-layer LCL
- 1298 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
022
WUUS51 KBOX 281807
SVRBOX
MAC001-005-007-023-RIC001-005-009-281900-
/O.NEW.KBOX.SV.W.0120.210928T1807Z-210928T1900Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
207 PM EDT Tue Sep 28 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Northwestern Dukes County in southeastern Massachusetts...
Southwestern Barnstable County in southeastern Massachusetts...
Southeastern Plymouth County in southeastern Massachusetts...
Southeastern Bristol County in southeastern Massachusetts...
Northeastern Washington County in Rhode Island...
Newport County in Rhode Island...
Southeastern Bristol County in Rhode Island...
* Until 300 PM EDT.
* At 207 PM EDT, a severe thunderstorm was located over Newport,
moving northeast at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
New Bedford, Fall River, Plymouth, Barnstable, Dartmouth, Falmouth,
Newport, Bristol, Marion, Middleborough, Wareham, Sandwich, Bourne,
Portsmouth, Middletown, Fairhaven, Tiverton, Westport, Mashpee and
Carver.
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.
&&
LAT...LON 4142 7094 4151 7099 4146 7119 4164 7122
4148 7124 4145 7134 4157 7137 4152 7132
4152 7131 4156 7131 4161 7142 4188 7060
4161 7038 4144 7084 4154 7065 4175 7063
4174 7071 4144 7085 4141 7095
TIME...MOT...LOC 1807Z 243DEG 37KT 4146 7127
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
RM1 follow-up statement
845
WWUS51 KBOX 281823
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
223 PM EDT Tue Sep 28 2021
RIC001-009-281832-
/O.CAN.KBOX.SV.W.0120.000000T0000Z-210928T1900Z/
Washington RI-Bristol RI-
223 PM EDT Tue Sep 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WASHINGTON AND
SOUTHEASTERN BRISTOL COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4142 7094 4151 7099 4146 7119 4164 7122
4188 7060 4161 7038 4144 7084 4154 7065
4175 7063 4174 7071 4144 7085 4141 7095
TIME...MOT...LOC 1822Z 243DEG 37KT 4153 7108
$$
MAC001-005-007-023-RIC005-281900-
/O.CON.KBOX.SV.W.0120.000000T0000Z-210928T1900Z/
Dukes MA-Barnstable MA-Plymouth MA-Bristol MA-Newport RI-
223 PM EDT Tue Sep 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EDT
FOR NORTHWESTERN DUKES...SOUTHWESTERN BARNSTABLE...SOUTHEASTERN
PLYMOUTH...SOUTHEASTERN BRISTOL AND EASTERN NEWPORT COUNTIES...
At 222 PM EDT, a severe thunderstorm was located near Westport, or
near Dartmouth, moving northeast at 45 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, Plymouth, Barnstable, Dartmouth, Falmouth,
Marion, Wareham, Sandwich, Bourne, Fairhaven, Tiverton, Westport,
Mashpee, 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.
&&
LAT...LON 4142 7094 4151 7099 4146 7119 4164 7122
4188 7060 4161 7038 4144 7084 4154 7065
4175 7063 4174 7071 4144 7085 4141 7095
TIME...MOT...LOC 1822Z 243DEG 37KT 4153 7108
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
RMThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 28, 9:11 AM EDT | Special Weather Statement | BOX | Providence | 49 min |
| Sep 28, 9:29 AM EDT | Severe Thunderstorm Warning | BOX | Providence | 61 min |
| Sep 28, 10:50 AM EDT | Special Weather Statement | BOX | Providence | 40 min |
| Sep 28, 11:18 AM EDT | Special Weather Statement | BOX | Bristol | 42 min |
| Sep 28, 1:36 PM EDT | Special Weather Statement | BOX | Newport, Washington | 39 min |
| Sep 28, 10:02 AM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Plymouth, Suffolk | 43 min |
| Sep 28, 10:06 AM EDT | Special Marine Warning | BOX | 54 min | |
| Sep 28, 11:42 AM EDT | Special Marine Warning | BOX | 48 min | |
| Sep 28, 1:58 PM EDT | Special Marine Warning | BOX | 47 min | |
| Sep 28, 2:30 PM EDT | Special Marine Warning | BOX | 45 min | |
| Sep 28, 2:58 PM EDT | Special Weather Statement | BOX | Barnstable | 47 min |
| Sep 28, 3:25 PM EDT | Small Craft Advisory | BOX | 28 hr | |
| Sep 28, 3:29 PM EDT | Special Marine Warning | BOX | 46 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.