NEW : approximately 500 flights are canceled at Denver International Airport . Parts of the region could be plowing out of up to 2 inches per hour of snow by winter . Areas east of the city are under a blizzard warning . A powerful winter storm whips through Denver on winter .
NEW : 600 flights are canceled at Denver International Airport . Parts of the region could be plowing out of 2 feet of snow by Saturday . Areas east of the city are under a blizzard warning . A powerful winter storm whips through Colorado on Friday .