F2 Leamington Tornado

[VE3NCQ]

From Environment Canada:

AWCN11 CWTO 090117
Weather summary for all of Southern Ontario and
The national Capital region
Issued by Environment Canada Toronto at 9:13 PM EDT Tuesday 8 June
2010.

Southern Ontario records the first two tornadoes of the year
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==weather event discussion==

 ..F1 tornado Eastern Ontario Saturday..
 ..F2 tornado Southwestern Ontario early Sunday..

 A tornadic thunderstorm tracked through Essex county early Sunday
morning with extensive damage to property and at the time of this
report no serious injuries.  The Environment Canada storm survey
Team recorded hundreds of properties damaged along a 40 km path from
near harrow to east of Leamington at the Lake Erie shoreline. This
thunderstorm produced a tornado which caused significant damage in
three areas along its track.

 At the beginning of the track the tornado moved southeast of harrow
toppling power poles and damaging structures. At one location a two
Storey brick home was shifted on its foundation..A barn was
completely destroyed and large Debris was tossed several hundred
metres. As a result of this damage the tornado has been upgraded to
A Fujita scale rating of f2 with wind speeds ranging from 180 to 240
km/h.

 In southern sections of Leamington the tornado produced extensive
Fujita scale f1 (120 to 170 km/h) damage. In addition there was a 1
km wide and 5 km long track of extensive damage where straight line
downburst winds caused structural damage due to the falling of
Mature trees.

 East of Leamington the storm survey team recorded additional f1
tornado damage that continued eastward to the Lake Erie shoreline.

 Severe storms tracked eastward near the villages of dalkeith and
ste-anne-de-Prescott on Saturday afternoon at 5PM. Environment Canada
Investigators documented extensive damage to barns..Grain bins..Corn
Silos..Houses and mobile homes as well as countless broken and
uprooted trees. Broken power poles resulted in loss of power for some
locations. The damage path was measured to be just over 8 km long and
ranged from 20 to 30 meters wide before appearing to dissipate at the
Ontario Québec border.  Investigators confirmed that the damage was
the result of an f1 tornado with estimated wind speeds of 120 to 170
km/h.

 Please note that this summary contains the observations at
The time of broadcast and does not constitute an official
And final report of the weather events or the high
Impact events attributed to the weather events.

END/OSPC

This is the radar snapshot I took at 3:20 AM. The red triangle indicates a Tornado Vortex Signature.

[VE3NCQ]

AWCN11 CWTO 081655
Weather summary for all of Southern Ontario and
The national Capital region
Issued by Environment Canada Toronto at 12:51 PM EDT Thursday 8 July
2010.

Reassessment of June 6 Leamington tornado...Not one tornado but
Three separate tornadoes
-------------------------------------------------------------
==weather event discussion==

After continued study of the damage pattern and the radar imagery
from the June 6 tornado event in the harrow and Leamington area, the
event has been reassessed from a single Fujita scale two tornado
(with peak winds of 180 to 240 km/h) to three separate tornadoes.

The first tornado from this event occurred south of harrow, between
dunn road and Erie road, and was rated as a Fujita scale one tornado,
with peak winds between 120 and 170 km/h, and a path length of
approximately 2 km.

The second tornado occurred along ridge road to the southeast of
harrow and was rated as a Fujita scale two tornado, with peak winds
between 180 and 240 km/h. The path length was approximately 1 km.

The third tornado occurred through southern sections of Leamington
and was rated as a Fujita scale one tornado, with peak winds between
120 and 170 km/h. The path length was approximately 7 km.

The Parent thunderstorm which spawned these three tornadoes also
caused other damage in the area due to downbursts, which are
localized, powerful wind gusts. Some of these downbursts were in the
Fujita scale one range, with peak winds between 120 and 170 km/h.

With this reassessment of the June 6 severe weather event, the total
number of tornadoes in Ontario this season now stands at six. The
summer severe weather season in Ontario runs from late April until
early October, and on average Ontario has 11 tornadoes each year.

END/OSPC



This is very interesting. I obtained the archived RADAR data for this storm, and I saw much the same thing. Once I compile all the images, I'll post them here.