What are Canada's worst tornadoes?
The following are the seven worst single tornadoes in Canada in terms of the number of fatalities and injuries, and often associated damage costs as well (dollar values unadjusted):
• Regina, SK F4 tornado, 30 Jun 1912 – 30 fatalities, hundreds injured, $4M damage
• Edmonton, AB F4 tornado, 31 Jul 1987 – 27 fatalities, over 300 injured, over $250M damage
• Windsor, ON F4 tornado, 17 Jun 1946 – 17 fatalities, over 100 injured, $1.5M damage
• Pine Lake, AB F3 tornado, 14 Jul 2000 – 12 fatalities, at least 130 injured, $12M damage
• Valleyfield, QC F4 tornado, 16 Aug 1888 – 11 fatalities, 40 injured, roughly $3M damage
• Windsor, ON F1 tornado, 3 Apr 1974 – 9 fatalities, 30 injured, $1.8M damage
• Barrie, ON F4 tornado, 31 May 1985 – 8 fatalities, 155 injured, $150M damage
There have been a number of impressive tornado outbreaks as well, with the eight largest one-day outbreaks listed below:
• Southern ON, 20 Aug 2009 – 19 tornadoes up to F2
• Southern ON, 2 Aug 2006 – 17 tornadoes up to F2
• Southern ON, 31 May 1985 – 14 tornadoes up to F4
• Southern QC, 5 Sep 2018 – 14 tornadoes up to EF2
• Southern SK / AB, 29 Jun 1984 – 13 tornadoes up to F2
• Southern AB, 31 Jul 1987 – 13 tornadoes up to F4
• Southern SK, 30 Jun 1912 – 12 tornadoes up to F4
• Southern AB, 8 Jul 1927 – 12 tornadoes up to F3
