OntarioWeatherSource.com
Weather summary for all of Southern Ontario and
The national Capital region
Issued by Environment Canada Toronto at 5:40 PM EDT Wednesday 26
August 2009.
Summary of the tornado outbreak over Ontario on August 20.
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==weather event discussion==
A series of powerful storms moved across Southern
Ontario on
August 20th. The following list includes the most recent information
on the tornadoes that were associated with these storms. Notable
changes include an adjusted total length of damage for the Durham
tornado of 36 kilometres. The tornadic damage began about 14
kilometres southwest of Durham and ended just to the northeast of
Markdale. The damage was fairly constant along this path.
In addition a path length has been provided for the
tornado that
occurred to the south and southeast of Thornbury affecting the
Georgian peaks ski area. The path of damage was intermittent and
about 9 kilometres in length with the first signs of damage occurring
in orchards near the 10th line and sideroad 18 area of Northern Grey
county.
Environment Canada damage investigations continued from
the
storms on August 20th with personnel today visiting damage locations
to the southeast of the Bancroft area in the carlow-Mayo and turriff
area. The damage investigation team has not reported back as of yet,
an updated statement will be issued Thursday morning.
Previous to the outbreak of tornadoes on August 20th
Environment
Canada had confirmed a 9th tornado of the season in the Woodstock
area on July 26th but did not send a storm summary bulletin out for
this event. This tornado was rated as a Fujita scale zero tornado
with peak winds under 115 kilometres per hour and did some minor tree
damage in the area. So with the addition of the 9 confirmed/probable
tornadoes from August 20th the total number of tornadoes for the
season so far stands at 18. In an average year Ontario has 11
tornadoes. The last time we had more than 2 tornadoes on one day
That were f2 or higher was May 31, 1985. On that day, there were
12 f2 tornadoes or higher. The greatest number of tornado events
In one year is 29 in 2006. The summer severe weather season normally
begins in late April and continues until early October.
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Date
Tornado location/path
damage overview
Tornado 1 5 km sw of Durham to Markdale f2 tornado
damage
(confirmed) (roughly 36 km)
(significant house
+ trailer damage,
Trees down)
Tornado 2 from south of Thornbury to the f2 tornado damage
(confirmed) southeast of Thornbury
(many trees snapped,
(intermittent
damage path of Georgian peaks sustained
Of 9 km)
damage, roofs removed,
Homes damaged)
Tornado 3 Woodbridge/Vaughan
f2 tornado damage
(confirmed) (several km long
(hundreds of homes
+ 50 metres
wide)
damaged, trees down,
Cars flipped)
Tornado 4 Newmarket area
f1 tornado damage
(confirmed)
(hockey arena almost
Demolished, royal
Canadian riding academy
Sustained damage)
Tornado 5 Gravenhurst area
f0 tornado damage
(confirmed) (path about 10 km long
(shallow rooted
And up to 1
km wide) trees
down)
Tornado 6 Milton
f1 tornado damage
(confirmed)
(light standards down,
Roof damage of medical
Centre and nearby hotel,
Trees and fences down,
Minor home damage)
Tornado 7 Haliburton forest and wildlife f1 tornado damage
(very
(confirmed) centre(northwest of Haliburton) large swath of trees
Damaged)
Tornado 8 redstone lake
f0 tornado damage
(confirmed)
(minor roof damage)
Tornado 9 arnstein to restoule to north
waterspout/tornado
(probable) bay (path length unknown at sightings
(large swath of
This time)
tree damage, shed moved,
Minor house damage)
Tornado 10 carlow Mayo area (east of
funnel cloud sighting
(possible) Bancroft)
(large area of tree
Damage)
Tornado 11 turriff (se of Bancroft)
large swath of tree
(possible)
damage, and hunting cabin
Damage.