While the hailstorm – caused by strong updrafts of cloud high in the atmosphere – was unusual in its severity, it was mild compared to a hailstorm that struck Calgary in Canada in June 2020. Hailstones the size of tennis balls caused damage to at least 70,000 homes and vehicles, destroyed crops and left the area facing a C$1.2bn (US$940m/£720m) repair bill. The 20-minute hailstorm was one of the country's most costly weather events.

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