A Snowstorm in APRIL?!

So yes, this is April!! Why is it snowing may you ask? I have no clue. This was in Alberta. It was crazy because that morning we were able to go to the mall without a coat and then later we were running to the vehicle because we had no coat. There was ice frozen to the windshield! Ridiculous! On the way back to my Aunt's house, there were flares set up on the side of the road and cops were there as well. They were making sure no one got onto one of the major highways leading out of the city due to a 54 car pileup. It was kind of funny because all of the semi's who were trucking by that route were all stopped on the side of the road not really sure what they should be doing. There was basically a wall of semi's on both sides of you for a good while.