Alert archive / Connecticut / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 74, NWS Boston/Norton, MA

September 5, 2017Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 5, 2017, 6:31 PM EDT for Capitol Planning Region, Connecticut. It was in force for 25 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 5, 2017, 6:31 PM EDT (22:31 UTC)
Expired: Sep 5, 2017, 6:56 PM EDT
In force: 25 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Capitol Planning Region, CT

The radar

The Brookhaven radar (KOKX), 88 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.5 hours before the alert went out and 88 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 217 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 902 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

849 
WUUS51 KBOX 052231
SVRBOX
CTC003-052330-
/O.NEW.KBOX.SV.W.0074.170905T2231Z-170905T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
631 PM EDT TUE SEP 5 2017

The National Weather Service in Taunton has issued a

* Severe Thunderstorm Warning for...
  Hartford County in northern Connecticut...

* Until 730 PM EDT

* At 631 PM EDT, a severe thunderstorm was located over Bristol,
  moving northeast at 30 mph.

  HAZARD...60 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Locations impacted include...
  Hartford, New Britain, West Hartford, Meriden, Bristol, Manchester,
  East Hartford, Enfield, Southington, Glastonbury, Newington,
  Windsor, Wethersfield, South Windsor, Farmington, Wolcott,
  Simsbury, Bloomfield, Berlin and Rocky Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4200 7257 4164 7253 4163 7271 4161 7271
      4159 7275 4158 7276 4157 7280 4155 7282
      4157 7285 4155 7285 4156 7288 4156 7295
      4161 7293 4164 7294 4164 7299 4177 7301
TIME...MOT...LOC 2231Z 241DEG 24KT 4168 7296 

HAIL...0.75IN
WIND...60MPH
 
$$

DUNTEN

1 follow-up statement

550 
WWUS51 KBOX 052256
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
656 PM EDT TUE SEP 5 2017

CTC003-052306-
/O.CAN.KBOX.SV.W.0074.000000T0000Z-170905T2330Z/
Hartford CT-
656 PM EDT TUE SEP 5 2017

...THE SEVERE THUNDERSTORM WARNING FOR HARTFORD COUNTY 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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Taunton.

LAT...LON 4200 7257 4164 7253 4163 7271 4161 7271
      4159 7275 4158 7276 4157 7280 4155 7282
      4157 7285 4155 7285 4156 7288 4156 7295
      4161 7293 4164 7294 4164 7299 4177 7301
TIME...MOT...LOC 2254Z 241DEG 24KT 4176 7276 

$$

DUNTEN

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Lasted
Sep 5, 5:17 PM EDT	Special Weather Statement	BOX	43 min
Sep 5, 6:10 PM EDT	Special Weather Statement	BOX	50 min
Sep 5, 7:05 PM EDT	Special Weather Statement	BOX	40 min
Sep 5, 7:48 PM EDT	Special Weather Statement	BOX	42 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2017 Every severe thunderstorm warning in 2017

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.