Environment Canada defended its performance during Monday's Calgary storms after some Calgarians complained the warning for the hailstorm came only once the hail had hit, saying they acted as quick as possible.

"When you're looking at the maps at the scale we are, the difference between Calgary and Strathmore is the width of a pencil head," said Meteorologist Bill McMurtry.

Widespread damage was reported across the city, including smashed windshields, downed tree branches, and even the U of C greenhouse roof was shattered.

"Warnings were issued as it developed over the city," said McMurty.

"Anyone that's lived in Calgary for any length of time knows that when you have thunderstorms in the forecast - especially in late June and July - you should prepare for hail."

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