This extremely violent tornado began in eastern Ohio, and tore directly through the towns of Niles, Ohio and Wheatland, Pennsylvania, producing F5 damage at both locations.
The tornado killed 18 people and injured 310, and was the most violent and deadly of the 43 recorded that day.
Registering F5 on the Fujita scale, it remains the only F5 in Pennsylvania history, and was also the most violent tornado reported in the United States in 1985.

It first touched down in Ohio near the Ravenna Arsenal in Portage County around 6:30 PM EDT.
Gathering strength, it moved quickly into Newton Falls in Trumbull County causing F3 to F4 damage through much of the town.
While nearly 400 homes were heavily damaged or destroyed, no fatalities were recorded in Newton Falls, due to storm preparedness of local authorities and its tornado siren.
Additional homes were completely destroyed as the tornado struck the north side of Lordstown.
Continuing east, the tornado reached F5 intensity as it tore through the north side of Niles.
Hundreds of homes in the Niles area were destroyed, including several homes with anchor bolts that were swept away with the debris scattered downwind.
The Niles Park Plaza shopping center was completely leveled and partially swept away at F5 intensity, with several of the fatalities occurring at that location.
Steel girders were buckled at the shopping center, and a nearby retirement home and a skating rink were leveled as well.
As the tornado struck an industrial area in Niles, large 30 foot tall metal petroleum storage tanks (each weighing 75,000 pounds) were torn from where they were anchored and thrown, some of which were tossed or bounced considerable distances.
One of the tanks was found in the middle of a road, 60 yards from where it originated.
The tornado weakened slightly as it tore through the north side of Hubbard and through the center of Coalburg, though many additional homes were still leveled in those areas.

As the tornado crossed the state line and reached Wheatland, Pennsylvania, it was a half-mile (0.8 km) wide and had regained F5 strength.
A steel-frame trucking plant in Wheatland was completely obliterated and partially swept away at F5 intensity, as the building's steel girder frame was mangled into a pile and pushed off of the foundation.
At nearby Wheatland Sheet and Tube, sections of pavement were scoured from the parking lot, and shards of sheet metal and routing slips were left wedged beneath the remaining asphalt.
Ninety-five percent of Wheatland's business and residential area were destroyed.
According to Storm Data from the National Weather Service, the destruction of the town "resembled that of a bombed-out battle field."
Continuing east, the tornado weakened slightly but remained violent as it struck Hermitage, damaging or destroying 71 homes along with the town's airport, destroying several hangars and planes.
A wing from one of the planes was found 10 miles away in Mercer.
Another trucking steel processing plant were heavily damaged in Hermitage as well.
The tornado then destroyed 15 homes and damaged 30 others in the Greenfield area before finally dissipating.

In Ohio, it was the deadliest tornado since the Xenia F5 during the Super Outbreak of April 3, 1974.
The tornado was also captured on camera by several residents.
This extremely violent tornado began in eastern Ohio, and tore directly through the towns of Niles, Ohio and Wheatland, Pennsylvania, producing F5 damage at both locations. The tornado killed 18 people and injured 310, and was the most violent and deadly of the 43 recorded that day. Registering F5 on the Fujita scale, it remains the only F5 in Pennsylvania history, and was also the most violent tornado reported in the United States in 1985.
It first touched down in Ohio near the Ravenna Arsenal in Portage County around 6:30 PM EDT. Gathering strength, it moved quickly into Newton Falls in Trumbull County causing F3 to F4 damage through much of the town. While nearly 400 homes were heavily damaged or destroyed, no fatalities were recorded in Newton Falls, due to storm preparedness of local authorities and its tornado siren. Additional homes were completely destroyed as the tornado struck the north side of Lordstown. Continuing east, the tornado reached F5 intensity as it tore through the north side of Niles. Hundreds of homes in the Niles area were destroyed, including several homes with anchor bolts that were swept away with the debris scattered downwind. The Niles Park Plaza shopping center was completely leveled and partially swept away at F5 intensity, with several of the fatalities occurring at that location. Steel girders were buckled at the shopping center, and a nearby retirement home and a skating rink were leveled as well. As the tornado struck an industrial area in Niles, large 30 foot tall metal petroleum storage tanks (each weighing 75,000 pounds) were torn from where they were anchored and thrown, some of which were tossed or bounced considerable distances. One of the tanks was found in the middle of a road, 60 yards from where it originated. The tornado weakened slightly as it tore through the north side of Hubbard and through the center of Coalburg, though many additional homes were still leveled in those areas.
As the tornado crossed the state line and reached Wheatland, Pennsylvania, it was a half-mile (0.8 km) wide and had regained F5 strength. A steel-frame trucking plant in Wheatland was completely obliterated and partially swept away at F5 intensity, as the building's steel girder frame was mangled into a pile and pushed off of the foundation. At nearby Wheatland Sheet and Tube, sections of pavement were scoured from the parking lot, and shards of sheet metal and routing slips were left wedged beneath the remaining asphalt. Ninety-five percent of Wheatland's business and residential area were destroyed. According to Storm Data from the National Weather Service, the destruction of the town "resembled that of a bombed-out battle field." Continuing east, the tornado weakened slightly but remained violent as it struck Hermitage, damaging or destroying 71 homes along with the town's airport, destroying several hangars and planes. A wing from one of the planes was found 10 miles away in Mercer. Another trucking steel processing plant were heavily damaged in Hermitage as well. The tornado then destroyed 15 homes and damaged 30 others in the Greenfield area before finally dissipating. 
In Ohio, it was the deadliest tornado since the Xenia F5 during the Super Outbreak of April 3, 1974. The tornado was also captured on camera by several residents.
1985 United States–Canada tornado outbreak