AWCN11 CWTO 212017
Weather summary for all of Southern Ontario and
The national Capital region
Issued by Environment Canada Toronto at 4:14 PM EDT Monday 21
September 2009.
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==weather event discussion==
..Four new tornadoes from August 20th outbreak..
An ongoing investigation into the tornado outbreak has lead to the
discovery of more tornadoes. This is based on new information from
eyewitnesses as well as further analysis of previously identified
tornadoes.
One added interesting note is that it appears the same Parent storm
generated intermittent tornado damage for a remarkable 125 km,
extending from new Lowell to moonstone through Gravenhurst to ril
lake.
The August 20th outbreak has now yielded 17 tornadoes, four of which
were rated f2. This now ties the record for most tornadoes in
Ontario in one day which was previously recorded on August 2nd 2006.
The updated total number of tornadoes for this season now stands at
26. 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.
Environment Canada continues to investigate reports concerning the
events of August 20th. Future storm summaries will be issued as
required over the course of the coming weeks.
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Tornado location/path damage overview
Tornado 1 14 km sw of Durham to Markdale f2 tornado damage
(roughly 36 km) (significant house
+ trailer damage,
Trees down)
Tornado 2 from south of Thornbury to the f2 tornado damage
Southeast of Thornbury (many trees snapped,
(intermittent damage path of Georgian peaks sustained
Of 9 km) damage, roofs removed,
Homes damaged)
Tornado 3 Woodbridge (southwestern f2 tornado damage
Vaughan) (dozens of homes
(3.5 km long & 100 metres wide) significantly damaged,
Trees down, cars flipped)
Tornado 4 Maple (Northeastern Vaughan) f2 tornado damage
(2.7 km long & 100 metres wide) (dozens of homes
Significantly damaged,
Trees down)
Tornado 5 Newmarket area f1 tornado damage
(hockey arena almost
Demolished, royal
Canadian riding academy
Sustained damage)
Tornado 6 Gravenhurst area f0 tornado damage
(path about 10 km long (shallow rooted
And up to 900 metres wide) trees down)
Tornado 7 Milton f1 tornado damage
(light standards down,
Roof damage of medical
Centre and nearby hotel,
Trees and fences down,
Minor home damage)
Tornado 8 Haliburton forest and wildlife f1 tornado damage (very
Centre(northwest of Haliburton) large swath of trees
Damaged)
Tornado 9 redstone lake f0 tornado damage
(minor roof damage)
Tornado 10 new Lowell to edenvale f1 tornado damage
(west of Barrie) (two roofs partially
(path 12.6 km long) removed, farm shed
Collapsed, 1000 pound
Trailer moved 300 Ft)
Tornado 11 Arnstein area f1 tornado damage
Waterspout/tornado
Sightings (large swath of
Tree damage, shed moved,
Minor house damage)
Tornado 12 Bancroft/Carlow Mayo area f1 tornado damage
(se of Bancroft) funnel cloud sighting
(large areas of tree
Damage)
Tornado 13 rice lake f1 tornado damage
(se of Peterborough) (roof and tree damage,
(path about 12 km long) car moved)
Tornado 14 buckshot lake f1 tornado damage
(nw of Plevna) (trees down and cottage
(1.2 km long & 400 metres wide) damaged)
Tornado 15 dollars lake f0 tornado damage
(ne of Britt) (trees down)
Tornado 16 moonstone f0 tornado damage
(nw of Orillia) tornado sightings
(path about 3 km long) (trees down, cottages/
Homes minor damage)
Tornado 17 ril lake f1 tornado damage
(se of Huntsville) (numerous trees down)