Tornadoes swept across parts of Colorado and destroyed or damaged several homes, while powerful storms brought flooding and marble-size hail to some areas. There were no reports of anyone being hurt. At least three homes were demolished Thursday in the town of Berthoud, about 40 miles north of Denver, said Lori Hodges, director of the Larimer County Office of Emergency Management. Crews were checking on reports of about 25 other homes that were possibly damaged or destroyed, but they were hindered by foul weather and darkness.