Alert archive / Connecticut / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 32, NWS Boston/Norton, MA

June 27, 2017Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 27, 2017, 7:16 PM EDT for Northeastern Connecticut Planning Region, Connecticut. It was in force for 44 min. 2 reports 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: Jun 27, 2017, 7:16 PM EDT (23:16 UTC)
Expired: Jun 27, 2017, 8:00 PM EDT
In force: 44 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Northeastern Connecticut Planning Region, CT

The radar

The Boston radar (KBOX), 81 km from the middle of the area, began a volume at 23:20 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
Jun 27, 7:18 PM EDT	HAIL 0.75	Mansfield, CT	PEA TO DIME SIZED HAIL.
Jun 27, 7:35 PM EDT	HAIL 0.75	Pomfret, CT	DIME SIZED HAIL MIIXED WITH PEA SIZED HAIL

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, 11.3 hours before the alert went out and 123 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: 48 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 1183 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: -49 m²/s²
0-3 km storm-relative helicity: 233 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.7

Open this sounding in Storm Lab

The text

As transmitted.

305 
WUUS51 KBOX 272316
SVRBOX
CTC013-015-280000-
/O.NEW.KBOX.SV.W.0032.170627T2316Z-170628T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
716 PM EDT TUE JUN 27 2017

The National Weather Service in Taunton has issued a

* Severe Thunderstorm Warning for...
  Central Windham County in northern Connecticut...
  Central Tolland County in northern Connecticut...

* Until 800 PM EDT

* At 715 PM EDT, a severe thunderstorm was located over Mansfield,
  moving east at 25 mph.

  HAZARD...50 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated, although spotters report hail up to a 
           half inch.

  IMPACT...Hail damage to vehicles is possible. Expect damage to 
           trees and power lines. 

* Locations impacted include...
  Mansfield, Windham, Plainfield, Willimantic, Killingly, Tolland,
  Coventry, Putnam, Thompson, Brooklyn, Woodstock, Willington,
  Columbia, Canterbury, Ashford, Pomfret, Sterling, Chaplin, Hampton
  and Eastford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4201 7181 4176 7180 4172 7220 4171 7224
      4171 7225 4170 7231 4187 7239
TIME...MOT...LOC 2315Z 252DEG 22KT 4181 7226 

HAIL...1.00IN
WIND...60MPH
 
$$

md

2 follow-up statements

332 
WWUS51 KBOX 272349
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
749 PM EDT TUE JUN 27 2017

CTC013-272358-
/O.CAN.KBOX.SV.W.0032.000000T0000Z-170628T0000Z/
Tolland CT-
749 PM EDT TUE JUN 27 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL TOLLAND 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 4189 7219 4201 7181 4176 7180 4173 7213
TIME...MOT...LOC 2348Z 252DEG 22KT 4187 7200 

$$

CTC015-280000-
/O.CON.KBOX.SV.W.0032.000000T0000Z-170628T0000Z/
Windham CT-
749 PM EDT TUE JUN 27 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR CENTRAL WINDHAM COUNTY...

At 748 PM EDT, a severe thunderstorm was located over Pomfret, or 13
miles northwest of Plainfield, moving east at 25 mph.

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

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is possible. Expect damage to trees 
         and power lines. 

Locations impacted include...
Windham, Plainfield, Killingly, Putnam, Thompson, Brooklyn,
Woodstock, Canterbury, Ashford, Pomfret, Sterling, Chaplin, Hampton,
Eastford and Scotland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4189 7219 4201 7181 4176 7180 4173 7213
TIME...MOT...LOC 2348Z 252DEG 22KT 4187 7200 

HAIL...1.00IN
WIND...60MPH
 
$$

md

573 
WWUS51 KBOX 272357
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
757 PM EDT TUE JUN 27 2017

CTC015-280007-
/O.EXP.KBOX.SV.W.0032.000000T0000Z-170628T0000Z/
Windham CT-
757 PM EDT TUE JUN 27 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL WINDHAM COUNTY WILL
EXPIRE AT 800 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.  However small hail
is still possible with this thunderstorm.

LAT...LON 4189 7219 4201 7181 4176 7180 4173 7213
TIME...MOT...LOC 2357Z 252DEG 22KT 4189 7193 

$$

md

The office that day

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

Issued	Product	Office	Lasted
Jun 27, 1:34 PM EDT	Special Weather Statement	BOX	41 min
Jun 27, 3:04 PM EDT	Special Weather Statement	BOX	41 min
Jun 27, 3:55 PM EDT	Special Weather Statement	BOX	65 min
Jun 27, 4:53 PM EDT	Special Weather Statement	BOX	67 min
Jun 27, 5:50 PM EDT	Special Weather Statement	BOX	40 min
Jun 27, 6:05 PM EDT	Special Weather Statement	BOX	55 min
Jun 27, 6:43 PM EDT	Special Weather Statement	BOX	47 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.