A fierce weather system -- featuring baseball-sized hail and multiple tornadoes -- ripped through Colorado on Wednesday afternoon, spurring warnings to people in and around Denver to take cover. The frenzy was tied to a dangerous super cell thunderstorm that, in addition to heaps of hail, produced a number of twisters, according to storm chasers on the scene. The National Weather Service said there were reported tornado touchdowns in Watkins, East Denver, Aurora, Byers and Leader. One witness, Jeff Piotrowski, said shortly after 3 p.m. (5 p.m. ET) that he had personally seen five tornadoes on the ground not far from Denver International Airport.