Alert archive / Connecticut / Tornado Warnings in 2020

Tornado Warning 6, NWS Boston/Norton, MA

August 4, 2020Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this tornado warning at Aug 4, 2020, 2:59 PM EDT for Capitol Planning Region, Connecticut. It was in force for 27 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 4, 2020, 2:59 PM EDT (18:59 UTC)
Expired: Aug 4, 2020, 3:26 PM EDT
In force: 27 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Capitol Planning Region, CT

The radar

The Brookhaven radar (KOKX), 114 km from the middle of the area, began a volume at 18:58 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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 4, 12:43 PM EDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.0 hours before the alert went out and 114 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: 1593 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 570 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 245 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 7.4

Open this sounding in Storm Lab

The text

As transmitted.

572 
WFUS51 KBOX 041859
TORBOX
CTC003-041945-
/O.NEW.KBOX.TO.W.0006.200804T1859Z-200804T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Boston/Norton MA
259 PM EDT Tue Aug 4 2020

The National Weather Service in Boston/Norton has issued a

* Tornado Warning for...
  Central Hartford County in northern Connecticut...

* Until 345 PM EDT.
    
* At 259 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Cromwell, or over Middletown, moving northwest at
  55 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  New Britain, Newington and Berlin around 305 PM EDT.
  East Hartford and Wethersfield around 310 PM EDT.
  Hartford, West Hartford, Bloomfield and Avon around 315 PM EDT.
  Farmington around 320 PM EDT.
  Simsbury and Canton around 325 PM EDT.
  Granby around 330 PM EDT.
  Hartland around 335 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4202 7281 4200 7281 4200 7277 4203 7275
      4203 7261 4202 7259 4164 7250 4165 7251
      4163 7271 4161 7272 4160 7274 4192 7291
      4197 7289 4197 7294 4202 7296
TIME...MOT...LOC 1859Z 153DEG 48KT 4159 7264 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Frank

2 follow-up statements

379 
WWUS51 KBOX 041909
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
309 PM EDT Tue Aug 4 2020

CTC003-041945-
/O.CON.KBOX.TO.W.0006.000000T0000Z-200804T1945Z/
Hartford CT-
309 PM EDT Tue Aug 4 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM EDT FOR CENTRAL
HARTFORD COUNTY...
    
At 309 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Hartford, moving north at 45 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This dangerous storm will be near...
  Bloomfield around 315 PM EDT.
  East Windsor around 320 PM EDT.
  Windsor, Simsbury and Windsor Locks around 325 PM EDT.
  East Granby around 330 PM EDT.
  Granby around 335 PM EDT.
  Suffield and Southwick around 340 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4202 7281 4200 7281 4200 7277 4203 7275
      4203 7261 4202 7259 4164 7250 4165 7251
      4163 7271 4161 7272 4160 7274 4192 7291
      4197 7289 4197 7294 4202 7296
TIME...MOT...LOC 1909Z 174DEG 34KT 4176 7267 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Frank

215 
WWUS51 KBOX 041926
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
326 PM EDT Tue Aug 4 2020

CTC003-041936-
/O.CAN.KBOX.TO.W.0006.000000T0000Z-200804T1945Z/
Hartford CT-
326 PM EDT Tue Aug 4 2020

...THE TORNADO WARNING FOR CENTRAL HARTFORD COUNTY IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM EDT for northern
Connecticut...and western Massachusetts.

LAT...LON 4202 7281 4200 7281 4200 7277 4203 7275
      4203 7261 4202 7259 4164 7250 4165 7251
      4163 7271 4161 7272 4160 7274 4192 7291
      4197 7289 4197 7294 4202 7296
TIME...MOT...LOC 1924Z 153DEG 48KT 4197 7281 

$$

Frank

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 10:55 PM EDT	Special Weather Statement	BOX		50 min
Aug 4, 5:05 AM EDT	Special Weather Statement	BOX		40 min

Nearby

Tornado Warnings in Connecticut, 2020 Every tornado warning in 2020 Tornadoes in 2020

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.