Alert archive / Connecticut / Tornado Warnings in 2019

Tornado Warning 12, NWS Boston/Norton, MA

September 4, 2019Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this tornado warning at Sep 4, 2019, 5:22 PM EDT for Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It was in force for 23 min. 14 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: Sep 4, 2019, 5:22 PM EDT (21:22 UTC)
Expired: Sep 4, 2019, 5:45 PM EDT
In force: 23 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT

The radar

The Boston radar (KBOX), 108 km from the middle of the area, began a volume at 21:23 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
Sep 4, 5:31 PM EDT	HAIL 1	Ellington, CT	CRYSTAL LAKE VILLAGE
Sep 4, 5:35 PM EDT	TSTM WND DMG	Vernon, CT	TREE AND WIRES DOWN ON HIGH STREET AND TRACY DRIVE
Sep 4, 5:35 PM EDT	TSTM WND DMG	Vernon, CT	TREE DOWN BLOCKING TOWER ROAD
Sep 4, 5:35 PM EDT	TSTM WND DMG	Vernon, CT	TREES AND WIRES DOWN ON PROSPECT STREET
Sep 4, 5:35 PM EDT	HAIL 1	Tolland, CT
Sep 4, 5:40 PM EDT	TORNADO	2 Nne North Coventry, CT	EF-1 RATED TORNADO (ESTIMATED 85-90 MPH WINDS) TRAVELLED ALONG A DISCONTINUOUS 3.2 MILE LONG TRACK. 50 YARDS WIDE. BEGAN ALONG NORTH RIVER RD IN COVENTRY, ENDED EAST OF PLAINS RD IN MANSFIELD. DAMAGE MAINLY TO TREES. VERY MINOR BUILDING DAMAGE. A SIGN AT A DAY
Sep 4, 5:44 PM EDT	HAIL 1	Willington, CT
Sep 4, 5:45 PM EDT	TSTM WND DMG	1 Wsw Merrow, CT	TREE AND WIRES DOWN ON MERROW ROAD IN COVENTRY CT.
Sep 4, 5:45 PM EDT	TSTM WND DMG	2 W Merrow, CT	APPROXIMATELY 100 TREES DOWNED AT THE SKUNGAMAUG RIVER GOLF CLUB ON FOLLY LANE IN COVENTRY CT
Sep 4, 5:54 PM EDT	TSTM WND DMG	Mansfield, CT	TREE AND WIRES DOWN ON RTE 32
Sep 4, 5:54 PM EDT	TSTM WND DMG	Mansfield, CT	TREE BRANCHES AND WIRES DOWN ON PLAINS ROAD
Sep 4, 5:54 PM EDT	TSTM WND DMG	Mansfield, CT	TREE BRANCHES AND WIRES DOWN ON PLAINS ROAD AND RAVINE ROAD
Sep 4, 5:54 PM EDT	TSTM WND DMG	Mansfield Depot, CT	AT A DAYCARE CENTER ON DEPOT ROAD A LARGE TREE WAS DOWNED AND A SIGN THAT WAS MOUNTED IN THE GROUND SNAPPED.
Sep 4, 5:54 PM EDT	TSTM WND DMG	Mansfield Depot, CT	CORN WAS FLATTENED IN A CORN FIELD NEAR THE INTERSECTION OF PLAINS AND STAFFORD ROADS.

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
Sep 4, 12:53 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.4 hours before the alert went out and 119 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: 17 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 558 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

229 
WFUS51 KBOX 042122
TORBOX
CTC003-013-015-042145-
/O.NEW.KBOX.TO.W.0012.190904T2122Z-190904T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Boston/Norton MA
522 PM EDT Wed Sep 4 2019

The National Weather Service in Boston/Norton has issued a

* Tornado Warning for...
  Northwestern Windham County in northern Connecticut...
  Central Tolland County in northern Connecticut...
  Northeastern Hartford County in northern Connecticut...

* Until 545 PM EDT.
    
* At 522 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Ellington, or near Vernon, moving east at 25 mph.

  HAZARD...Tornado and half dollar size hail.

  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...
  Ellington around 530 PM EDT.
  Vernon around 535 PM EDT.
  Mansfield, Tolland and Coventry around 545 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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4186 7263 4200 7256 4196 7215 4174 7223
TIME...MOT...LOC 2122Z 284DEG 21KT 4190 7250 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Loconto

2 follow-up statements

960 
WWUS51 KBOX 042134
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
534 PM EDT Wed Sep 4 2019

CTC003-013-015-042145-
/O.CON.KBOX.TO.W.0012.000000T0000Z-190904T2145Z/
Windham CT-Tolland CT-Hartford CT-
534 PM EDT Wed Sep 4 2019

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM EDT FOR WEST
CENTRAL WINDHAM...CENTRAL TOLLAND AND NORTHEASTERN HARTFORD
COUNTIES...
    
At 534 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Tolland, or near Vernon, moving east at 30 mph.

HAZARD...Tornado and half dollar size hail.

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...
  Mansfield and Coventry around 545 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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4184 7255 4192 7251 4197 7243 4194 7216
      4174 7223
TIME...MOT...LOC 2134Z 290DEG 26KT 4186 7238 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Loconto

638 
WWUS51 KBOX 042145
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
545 PM EDT Wed Sep 4 2019

CTC003-013-015-042154-
/O.EXP.KBOX.TO.W.0012.000000T0000Z-190904T2145Z/
Windham CT-Tolland CT-Hartford CT-
545 PM EDT Wed Sep 4 2019

...THE TORNADO WARNING FOR WEST CENTRAL WINDHAM...CENTRAL TOLLAND AND
NORTHEASTERN HARTFORD COUNTIES WILL EXPIRE AT 545 PM EDT...
    
The Tornado Warning that was previously in effect has been reissued 
for western Windham and eastern Tolland Counties and is in effect 
until 615 PM. Please refer to that bulletin for the latest severe 
weather information.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern Connecticut.

Remember, a Tornado Warning still remains in effect for western 
Windham and eastern Tolland Counties and is in effect until 615 PM.

LAT...LON 4184 7255 4192 7251 4197 7243 4194 7216
      4174 7223
TIME...MOT...LOC 2144Z 284DEG 21KT 4185 7231 

$$

Loconto

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 4:17 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	58 min
Sep 4, 4:53 PM EDT	Tornado Warning	BOX	Capitol Planning Region	37 min
Sep 4, 5:13 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	62 min
Sep 4, 5:43 PM EDT	Tornado Warning	BOX	Northeastern Connecticut Planning Region	32 min
Sep 4, 6:11 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	49 min

Nearby

Tornado Warnings in Connecticut, 2019 Every tornado warning in 2019 Tornadoes 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.