Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 101, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 12, 2021, 6:26 PM EDT for Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It was in force for 49 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
- Aug 12, 2021, 6:26 PM EDT (22:26 UTC)
- Expired
- Aug 12, 2021, 7:15 PM EDT
- In force
- 49 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT
The radar
The Brookhaven radar (KOKX), 105 km from the middle of the area, began a volume at 22:30 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 |
|---|---|---|---|
| Aug 12, 6:40 PM EDT | TSTM WND DMG | Willington, CT | TREES DOWN ON ELDRIDGE MILLS 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 12:00Z, 10.4 hours before the alert went out and 105 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
- 278 J/kg
- Mixed-layer CIN
- -162 J/kg
- Mixed-layer LCL
- 1400 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -82 m²/s²
- 0-3 km storm-relative helicity
- -47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
992
WUUS51 KBOX 122226
SVRBOX
CTC003-013-015-122330-
/O.NEW.KBOX.SV.W.0101.210812T2226Z-210812T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
626 PM EDT Thu Aug 12 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Southern Windham County in northern Connecticut...
Tolland County in northern Connecticut...
Central Hartford County in northern Connecticut...
* Until 730 PM EDT.
* At 625 PM EDT, severe thunderstorms were located along a line
extending from Stafford to Canton, moving east at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
* Locations impacted include...
Hartford, New Britain, West Hartford, Manchester, East Hartford,
Glastonbury, Newington, Vernon, Windsor, Wethersfield, Mansfield,
South Windsor, Farmington, Windham, Simsbury, Bloomfield, Berlin,
Rocky Hill, Avon and Willimantic.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These storms have a history of producing damage. For your protection
move to an interior room on the lowest floor of a building.
&&
LAT...LON 4181 7295 4183 7294 4184 7294 4185 7295
4187 7295 4199 7226 4177 7185 4171 7223
4171 7225 4162 7277 4180 7299
TIME...MOT...LOC 2225Z 281DEG 20KT 4197 7232 4187 7293
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Nash2 follow-up statements
853
WWUS51 KBOX 122259
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
659 PM EDT Thu Aug 12 2021
CTC003-122308-
/O.CAN.KBOX.SV.W.0101.000000T0000Z-210812T2330Z/
Hartford CT-
659 PM EDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL HARTFORD COUNTY IS
CANCELLED...
The storms which prompted the warning have weakened and moved out
of the area. Therefore, the warning has been cancelled.
LAT...LON 4172 7217 4176 7228 4186 7202 4177 7185
TIME...MOT...LOC 2258Z 286DEG 24KT 4179 7195 4175 7213
$$
CTC013-015-122330-
/O.CON.KBOX.SV.W.0101.000000T0000Z-210812T2330Z/
Windham CT-Tolland CT-
659 PM EDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR CENTRAL WINDHAM AND EAST CENTRAL TOLLAND COUNTIES...
At 658 PM EDT, severe thunderstorms were located along a line
extending from Brooklyn to near Chaplin, moving east at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Mansfield, Windham, Killingly, Brooklyn, Canterbury, Pomfret,
Chaplin, Hampton, Eastford and Scotland.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4172 7217 4176 7228 4186 7202 4177 7185
TIME...MOT...LOC 2258Z 286DEG 24KT 4179 7195 4175 7213
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Nash422
WWUS51 KBOX 122315
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
715 PM EDT Thu Aug 12 2021
CTC013-015-122325-
/O.CAN.KBOX.SV.W.0101.000000T0000Z-210812T2330Z/
Windham CT-Tolland CT-
715 PM EDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL WINDHAM AND EAST
CENTRAL TOLLAND COUNTIES IS CANCELLED...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning has
been cancelled.
LAT...LON 4172 7217 4176 7228 4186 7202 4177 7185
TIME...MOT...LOC 2314Z 281DEG 20KT 4177 7183 4173 7201
$$
NashThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 2:53 PM EDT | Heat Advisory | BOX | Capitol Planning Region, Northeastern Connecticut Planning Region | 29 hr |
| Aug 12, 5:35 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 55 min |
| Aug 12, 6:13 PM EDT | Severe Thunderstorm Warning | BOX | Northeastern Connecticut Planning Region | 62 min |
Nearby
Severe Thunderstorm Warnings in Connecticut, 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.