![]() The system formed south of Chicago on Saturday morning, and then it moved through Ontario, according to tornado expert David Sills. ![]() "This was an unusual event because it affected the most populated part of Canada," Kimbell said. What made Saturday's storm especially unlucky was that several urban centres were directly in its path. "It is the widespread nature of a derecho that can really cause havoc in a city," Sills said. ![]() National Oceanic and Atmospheric Administration, that storm cut a path through Thunder Bay and sparsely populated areas of northern Ontario before crossing into Quebec, where it killed one person, toppled trees, damaged buildings and overturned boats in the Montreal area. The last string of significant derechos that hit Canada were in the 1990s, including one in 1999. A rare event: Canada's 1st derecho since 1999 He said both Ottawa and Toronto airports reported 120 km/h winds. Sills said he expects there could be even more.Įven if that's the case, "the overwhelming majority of the damage was caused by straight line derecho winds," said Environment Canada warning preparedness meteorologist Peter Kimbell. ![]() The team is investigating at least four other possible tornadoes in southern Ottawa, London, Ont., and Rawdon, Que. Canada's building codes don't focus on tornadoes - even though we see 2nd most in the world. ![]()
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