What's a derecho and why is it so destructive? The science behind this powerful storm - CBC News

When Canadian tornado expert David Sills studied the forecast on Saturday morning, he never expected the line of storms headed for Windsor, Ont., would soon strengthen into Canada’s first derecho in decades, wreaking havoc across southern Ontario and Quebec.

When Canadian tornado expert David Sills studied the forecast on Saturday morning, he never expected the line of storms headed for Windsor, Ont., would soon strengthen into Canada's first derecho in … [+4890 chars]

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