Alert archive / Connecticut / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 64, NWS Boston/Norton, MA

August 2, 2017Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 2, 2017, 3:56 PM EDT for Northeastern Connecticut Planning Region, Connecticut. It was in force for 49 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: Aug 2, 2017, 3:56 PM EDT (19:56 UTC)
Expired: Aug 2, 2017, 4:45 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), 81 km from the middle of the area, began a volume at 20:00 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, 7.9 hours before the alert went out and 128 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.

379 
WUUS51 KBOX 021956
SVRBOX
CTC013-015-022045-
/O.NEW.KBOX.SV.W.0064.170802T1956Z-170802T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
356 PM EDT WED AUG 2 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 445 PM EDT

* At 356 PM EDT, a severe thunderstorm was located over 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, Windham, Willimantic, Killingly, Tolland,
  Coventry, Putnam, Brooklyn, Woodstock, Willington, Columbia,
  Ashford, Pomfret, Andover, Chaplin, Hampton and Eastford.

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 4201 7198 4180 7185 4170 7233 4183 7243
TIME...MOT...LOC 1956Z 246DEG 15KT 4180 7222 

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

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, 1:11 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	49 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, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.