Tornadoes in Canada occur most frequently across the Canadian Prairies (including southern Alberta, Saskatchewan, and Manitoba) and southern Ontario, which records the highest per-square-mile density of tornado activity in the country. Regions like Southwestern Ontario, the GTA, and the Ottawa Valley experience regular severe summer convective storm activity driven by warm, humid air masses colliding with cooler northern fronts. While the Prairies record a high absolute number of annual twisters across wide-open rural terrain, southern Ontario's dense population zones make severe weather monitoring critical.
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