Ottawa: Bluesfest ( music ) Stage Collapse

here a official news...

The Ottawa Bluesfest Stage Collapse is Terrifying The closing night of the Ottawa Bluesfest was cut short after a violent storm moved in very suddenly, and an accompanying gust of wind blew over the main stage where Cheap Trick had played just minutes before. Watch the terrifying collapse in this video. (There's also footage of the dark clouds rolling in here. It's straight out of Harry Potter!) The official statement from the fest was that there were "no serious injuries on site." Had the stage collapsed forward, and not backwards, that might have been a very different scenario. The Toronto Sun reports Ottawa Mayor Jim Watson was in a booth in a scaffolding tower when the storm hit, and only the "action of a quick-thinking aide" who grabbed his arm saved him from a 50-foot fall.
 
Clouds above indicate turbulant descending air ahead of the thunderstorm (looks like mammatus clouds). This would probably produce quite strong downdrafts causing the stage to collapse as it would've acted as a big sail? You can see how strong the winds are by the amount of debris flying about in the air.

Have experienced something similar in this country (but less extreme) which blew away sun loungers on the beach because of the sudden increase in wind speed.
 
A friend over there told me about this a few days ago, he helped set the stage up a couple of years back and said it was an awfully designed thing with a lot of weight in the rafters. Glad there were no serious injuries though.
 
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