|Calgary has the craziest weather. I haven't lived there since I was 4,, but even just counting vistis I have been snowed on every month of the year there.|
Any systems that make it all the way through 1000km of BC mountains from the Pacific swoop down on them, so in the middle of winter it might go from -10C to +1-C in a few hours, and then back.if a chinook moves through.
Wikipedia has a nice wrte up on chinooks
One time I was competing in the Canadian Ultimate Championships in Calgary and noticed that during one of our games it was simultaneously sunny, cloudy, windy, raining, hailing, snowing, and thundering with lightning
That said, basketball-sized hail with tornadoes is extreme even for Cowtown.