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DarkSky
08-25-2009, 07:20 PM
Awcn11 cwto 252140
weather summary for all of southern ontario and
the national capital region
issued by environment canada toronto at 5:38 pm edt tuesday 25
august 2009.
Summary of the tornado outbreak over ontario on august 20.
-------------------------------------------------------------
==weather event discussion==
..yet another damage survey team heads out to the kenisis lake area
near haliburton today..
A triple barrelled severe weather outbreak struck ontario last
thursday.
Shortly after noon a supercell storm developed just south of lake
huron. This cell tracked northeastward for a remarkable 200 km
producing the durham and thornbury tornadoes. The storm cell
finally weakened over georgian bay toward evening.
At the same time a squall line developed over lower michigan then
tracked across southern ontario during the afternoon and evening
hours. This feature produced straight line wind damage to several
locales from windsor to well northeast of toronto as well as the
destructive vaughan and newmarket tornadoes.
Finally in the early evening isolated supercell storms tracked
to the east of georgian bay. One tracked northeastward to produce a
probable tornado over the area between arnstein and north bay as
well as a waterspout over lake nipissing.
Another tornado tracked through the gravenhurst area before lifting.
It appears this storm or one near it probably spawned a tornado that
went through the redstone lake and kennisis lake district. This
brings the total thus far for the august 20 storms to 6 confirmed
tornadoes and 2 probable tornadoes.
There was one fatality with the tornado in the south end of durham.
Several of the tornadoes were rated as f2 damage on the fujita
scale. F2 damage is equivalent to wind strength of 180 to 250 km/h.
The following is a list of tornadoes and associated damage assessed
by a total of five separate environment canada storm damage teams.
-------------------------------------------------------------
date
tornado location/path damage overview
tornado 1 5 km sw of durham to markdale f2 tornado damage
(confirmed) (roughly 20 km) (significant house
+ trailer damage,
trees down)
tornado 2 from south of thornbury to the f2 tornado damage
(confirmed) southeast of thornbury (path (many trees snapped,
length unknown) georgian peaks sustained
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 arnstein to restoule to north waterspout/tornado
(probable) bay (path length unknown at sightings (damage details
this time) uncertain at this time)
tornado 8 redstone lake / kennisis lake tornado sightings (trees
(probable) (north of haliburton) down/cottages damaged)
(intensity uncertain at
this time)
environment canada continues to evaluate the damage from the storms
and will update this message as necessary.
End/ospc

DarkSky
08-27-2009, 10:41 PM
The seem to keep releasing this statement.. this is the latest one below. 'Not sure if there's a lot of change to it from the one above:

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AWCN11 CWTO 272018
WEATHER SUMMARY FOR ALL OF SOUTHERN ONTARIO AND
THE NATIONAL CAPITAL REGION
ISSUED BY ENVIRONMENT CANADA TORONTO AT 4:15 PM EDT THURSDAY 27
AUGUST 2009.
SUMMARY OF THE TORNADO OUTBREAK OVER ONTARIO ON AUGUST 20.
-------------------------------------------------------------
==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.
ENVIRONMENT CANADA DAMAGE INVESTIGATIONS CONTINUED FROM THE
STORMS ON AUGUST 20TH WITH PERSONNEL YESTERDAY VISITING DAMAGE
LOCATIONS TO THE SOUTHEAST OF THE BANCROFT AREA IN THE CARLOW-MAYO
AND TURRIFF AREA. THE DAMAGE INVESTIGATION TEAM AND OTHER
INFORMATION INDICATES THAT THE TURRIFF AND CARLOW MAYO AREA IS
MOST LIKELY ONE TORNADO DAMAGE PATH. THEREFORE WE HAVE REMOVED THE
11TH POSSIBLE TORNADO FROM THE LIST BELOW AND COMBINED IT AS THE
PROBABLE TORNADO 10.
NUMEROUS REPORTS OF WATERSPOUT SIGHTINGS IN THE EASTERN PART OF
LAKE NIPISSING BETWEEN THE NORTH BAY MARINA AND THE MANITOU ISLANDS
WERE LIKELY LINKED TO THE THUNDERSTORM THAT PRODUCED THE PROBABLE
TORNADO IN THE ARNSTEIN/RESTOULE AREA.
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 10 CONFIRMED/PROBABLE
TORNADOES FROM AUGUST 20TH THE TOTAL NUMBER OF TORNADOES FOR THE
SEASON SO FAR STANDS AT 19. 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 RECEIVE REPORTS CONCERNING THE
EVENTS OF AUGUST 20TH. FUTURE STORM SUMMARIES WILL BE ISSUED AS
REQUIRED OVER THE COURSE OF THE COMING DAYS.
---------------------------------------------------------------
DATE
TORNADO LOCATION/PATH DAMAGE OVERVIEW
TORNADO 1 14 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 BANCROFT/CARLOW MAYO AREA FUNNEL CLOUD SIGHTING
(PROBABLE) (SE OF BANCROFT) (LARGE AREAS OF TREE
DAMAGE)
ENVIRONMENT CANADA CONTINUES TO EVALUATE THE DAMAGE FROM THE STORMS
AND WILL UPDATE THIS MESSAGE AS NECESSARY.
END/OSPC