Tornado hits north of Denver

(CNN) - At least one massive tornado swept across northern Colorado's Front Range on Thursday, bringing golf ball-size hail and ripping roofs off buildings in its path, a fire department official said.

Several ambulance were dispatched in the wake of the storm, which struck several areas in the town of Windsor, but there was no immediate confirmation of any injuries, Weld County fire spokeswoman Brenda Stroman said. The storm hit "several other areas" of the county as well, she said.

Windsor is about 80 miles north of Denver. It is just east of the Rocky Mountains and the college town of Fort Collins, home to the University of Northern Colorado.

The storm dissipated rapidly after the tornado struck, but thunderstorm warnings and tornado watches remained in effect for much of northeastern Colorado.

 – CNN Meteorologist Chad Myers contributed to this report.