It's been 40 years since western Pennsylvania endured one of the worst tornado outbreaks ever to hit the area.

Keystone State, including the first and only F5. This WTAE archive video shows some of the widespread damage in Pennsylvania.

It was "one of rarest" tornado outbreaks on record, says a tornado expert, but "things like that are possible." ...

The outbreak produced Pennsylvania's first and only F5 tornado, a violent twister that came out of eastern Ohio and crossed ...

A warm spring day turned to terror for residents of Pennsylvania, Ohio and southern Ontario 40 years ago this weekend.

Timeline: Hurricane Milton's tornado outbreak in Palm Beaches, Treasure Coast ...

Forty years have passed since one of the most destructive tornado outbreaks in Pennsylvania history tore through the region, leaving a lasting mark on our communities.

Hours before the Hurricane Milton made landfall on the west coast of Florida, something was brewing to the east: a historic outbreak of ... four adult children. The tornado peeled off the roof ...

Above: Damage from an F4 tornado that tore through the heart of Omaha, Nebraska, on Easter Sunday 1913 (March 23). It was part of the worst tornado outbreak ... and how 1970 may be the transition ...