August 20th, 2009 - 1 Day, 1 Province, 19 Tornadoes - The Weather Network
On August 20th, 2009, 19 tornadoes touched down in Ontario. This is Ontario's record for most tornadoes in a single day.
www.theweathernetwork.comI don’t have live tool access right now, but I can summarize the latest widely reported context about the 2009 Southern Ontario tornado outbreak.
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The 2009 Southern Ontario tornado outbreak occurred on August 20, 2009, producing 19 tornadoes across Southwestern and Central Ontario and the GTA, making it Ontario’s largest single-day tornado outbreak on record. It also stands as one of the most costly and destructive tornado events in the province, with damages concentrated in Grey County, Vaughan, and Durham, and one confirmed fatality.[2][3][4]
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In terms of impact, the event led to widespread emergency declarations in several hard-hit regions, extensive property damage (including hundreds of homes in Vaughan and damages to apple orchards in Grey County, total costs reaching tens of millions of dollars in the hardest-hit areas), and drew attention to Ontario’s tornado risk patterns, prompting ongoing interest from authorities and researchers about meteorological conditions that day.[4][2]
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Anniversary coverage and retrospective analyses have highlighted the scale: more than 10 million Canadians were at some point under watches or warnings, and the outbreak’s total economic toll has been cited around the $100 million mark in some reports, underscoring its significance in Canadian weather history.[3][4]
If you’d like, I can pull more details on specific tornado tracks, damage surveys, or the meteorological setup from reputable sources, and provide links or a concise timeline.