Canada's first widely known F5 tornado was probably either the 1987 Edmonton tornado or the 1912 Regina tornado rather than the 2007 Elie tornado.
Both were mutli-vortex and well into the 200+ km/h wind range but the one in Regina happened during a time when methods of scrutinizing a storm were either primitive or non-existent and the one in Edmonton (thankfully) reached peak intensity in an industrial zone with relatively few people around where damage done to civilian abodes couldn't be used to pinpoint its categorization like the one in Elie.
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