DENVER A powerful autumn snowstorm slowly worked its way out of Colorado and into Nebraska and Kansas Thursday, causing blizzard conditions on the eastern plains and leaving in its wake treacherous roads and hundreds of canceled flights.
more than 3 feet of snow in the foothills west of Denver and closed hundreds of schools and businesses
Mount Rushmore National Memorial in western South Dakota was shut down
United Airlines, the airport's dominant carrier with about 400 flights per day, canceled half its flights Thursday
most eastern Colorado roads would be impassible Thursday night because of blowing snow and near-zero visibility.
Snow drifts were running up to 4 feet in Cheyenne and up to 6 feet 30 miles north of the city.
