Extreme flooding in Calgary, Canada on Saturday (June 13) left cars partially submerged on a highway and a man trapped, standing on the roof of his car.<br /><br />The filmer, Akbar Ali told Newsflare: "It feels apocalyptic. The city was turned upside in a matter of 25 minutes. From a nice sunny day to dark clouds, wrecked cars and houses, and floods everywhere.<br /><br />"Within minutes, it was hailing the size of tennis balls, and water was pouring down as we had never seen before."<br /><br />According to local media, emergency crews used rescue boats to help drivers and their passengers out of the floodwaters.