West Mifflin, Pa. ? A severe storm swept through a crowded amusement park Friday night, killing one person and injuring nearly 50, including many children, authorities said.

A roof over a ride called The Whip collapsed or partially collapsed, crushing one person, said Mary Lou Rosemeyer, a spokeswoman for Kennywood Park in suburban Pittsburgh. The storm, with 80 mph winds, felled many trees in the park.

“The wind was incredible and there was an extensive amount of damage,” Rosemeyer said.

At least 47 people were taken to hospitals, Allegheny County spokeswoman Margaret Philbin said. The coroner’s office confirmed one person died.

Most of the injured were hit by hail or wind-driven debris and were not under the roof that collapsed, Rosemeyer said.

Children’s Hospital of Pittsburgh admitted 12 children whose ages appeared to range from 9 to 14, spokeswoman Melanie Finnigan said. Most of the children had neck, face and head injuries, and two needed surgery for internal injuries, she said.

Officials at the other hospitals said many of the injured had broken bones. One girl, 4, had a skull fracture. Others injured were mostly parents who had used their bodies to shield their children.

An Allegheny County emergency dispatcher said there was widespread flooding, mudslides and fallen trees across the county.

The severe weather raced through parts of the Northeast on Friday. A tornado hit Johnstown, N.Y., the National Weather Service said. It caused structural damage to a hotel and movie theater, but no injuries were reported.

The Whip opened in 1918 and consists of 16 cars that “whip” as they go around the bends of an oblong track. The roof was constructed in 1995.

The 103-year-old park has 31 major rides, including three wooden roller coasters. It has been designated a national and state historic landmark.

Thirty people were injured at the park in 1999 when a roller-coaster operator failed to brake.