Alert archive / Connecticut / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 113, NWS Boston/Norton, MA

August 21, 2019Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 21, 2019, 6:42 PM EDT for Capitol Planning Region, Connecticut. It was in force for 33 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: Aug 21, 2019, 6:42 PM EDT (22:42 UTC)
Expired: Aug 21, 2019, 7:15 PM EDT
In force: 33 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Capitol Planning Region, CT

The radar

The Brookhaven radar (KOKX), 97 km from the middle of the area, began a volume at 22:42 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 21, 6:45 PM EDT	TSTM WND DMG	1 Nne Forest Village, CT	LARGE BRANCHES DOWN ON BIRCHWOOD AND MILWOOD ROADS IN EAST HARTFORD CT. ONE LARGE BRANCH DOWN AT CORNER OF BIRCHWOOD ROAD AND SILVER LANE.
Aug 21, 6:52 PM EDT	TSTM WND DMG	Wethersfield, CT	TREE LIMBS DOWN ON LINDEN STREET AND HAROLD STREET.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 21, 1:53 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.7 hours before the alert went out and 97 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: 2157 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted.

128 
WUUS51 KBOX 212242
SVRBOX
CTC003-013-212315-
/O.NEW.KBOX.SV.W.0113.190821T2242Z-190821T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
642 PM EDT Wed Aug 21 2019

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Southwestern Tolland County in northern Connecticut...
  Southeastern Hartford County in northern Connecticut...

* Until 715 PM EDT.

* At 641 PM EDT, a severe thunderstorm was located over Glastonbury,
  moving east at 35 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, Manchester, East Hartford, Glastonbury, Wethersfield,
  Mansfield, East Hampton, Rocky Hill, Cromwell, Coventry, Hebron,
  Portland, Lebanon, Marlborough, Columbia, Bolton and Andover.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4176 7269 4182 7230 4170 7225 4169 7227
      4167 7227 4164 7233 4160 7233 4160 7248
      4165 7251 4163 7261 4164 7266
TIME...MOT...LOC 2241Z 267DEG 30KT 4168 7260 

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

KJC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 12:59 PM EDT	Special Weather Statement	BOX		61 min
Aug 21, 1:25 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	65 min
Aug 21, 2:26 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	43 min
Aug 21, 2:57 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	38 min
Aug 21, 5:34 PM EDT	Special Weather Statement	BOX		41 min
Aug 21, 5:47 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	58 min
Aug 21, 5:54 PM EDT	Tornado Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	51 min
Aug 21, 6:34 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	56 min
Aug 21, 6:45 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	30 min
Aug 21, 6:48 PM EDT	Tornado Warning	BOX	Capitol Planning Region	42 min
Aug 21, 7:14 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	38 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2019 Every severe thunderstorm warning in 2019

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.