Alert archive / Connecticut / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 55, NWS Boston/Norton, MA

August 2, 2017Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 2, 2017, 1:11 PM EDT for 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 2, 2017, 1:11 PM EDT (17:11 UTC)
Expired: Aug 2, 2017, 2:00 PM EDT
In force: 49 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), 93 km from the middle of the area, began a volume at 17:11 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 2, 1:20 PM EDT	HAIL 1	Coventry, CT	TRAINED SPOTTER

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, 5.2 hours before the alert went out and 127 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: 823 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1051 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

917 
WUUS51 KBOX 021711
SVRBOX
CTC013-015-021800-
/O.NEW.KBOX.SV.W.0055.170802T1711Z-170802T1800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
111 PM EDT WED AUG 2 2017

The National Weather Service in Taunton has issued a

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

* Until 200 PM EDT

* At 110 PM EDT, a severe thunderstorm was located over Coventry, or
  near Mansfield, moving northeast at 15 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...
  Vernon, Mansfield, Ellington, Tolland, Coventry, Stafford,
  Woodstock, Willington, Columbia, Bolton, Ashford, Pomfret, Andover,
  Chaplin, Eastford and Union.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4203 7230 4203 7218 4192 7198 4170 7232
      4179 7247
TIME...MOT...LOC 1710Z 216DEG 13KT 4180 7234 

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

LEC

1 follow-up statement

862 
WWUS51 KBOX 021758
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
158 PM EDT WED AUG 2 2017

CTC013-015-021807-
/O.EXP.KBOX.SV.W.0055.000000T0000Z-170802T1800Z/
Windham CT-Tolland CT-
158 PM EDT WED AUG 2 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WINDHAM AND
CENTRAL TOLLAND COUNTIES WILL EXPIRE AT 200 PM EDT...
                
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 will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

LAT...LON 4203 7230 4203 7218 4192 7198 4170 7232
      4179 7247
TIME...MOT...LOC 1757Z 216DEG 13KT 4193 7221 

$$

LEC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 11:55 AM EDT	Flash Flood Watch	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	8 hr
Aug 2, 1:07 PM EDT	Special Weather Statement	BOX		23 min
Aug 2, 1:45 PM EDT	Special Weather Statement	BOX		45 min
Aug 2, 2:45 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	45 min
Aug 2, 2:54 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	51 min
Aug 2, 3:10 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	50 min
Aug 2, 3:56 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	49 min
Aug 2, 4:44 PM EDT	Flash Flood Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	3 hr
Aug 2, 4:56 PM EDT	Special Weather Statement	BOX		49 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.