Heavy snowfall caused an avalanche in Utah that was captured in dramatic video from a nearby vehicle Saturday afternoon. Local media reported that up to five inches of snow per hour fell around the Little Cottonwood Canyon area, sparking the avalanche and briefly stranding skiers. A massive winter storm is set to impact millions of Americans from the Midwest to the East Coast, the National Weather Service has said, bringing the threat of blizzards, heavy snow, treacherous ice and freezing rain t