A town in Pennsylvania called Wheatland was nearly wiped out by a massive F5 tornado. It's the only F5 in Pennsylvania's history. It killed 18 people and injured 310, and was one of the most powerful tornadoes observed east of the Mississippi. The Wheatland tornado actually started in Ohio and then immediately strengthened from F0 to F3, then moved into Pennsylvania as an F4 and a weak F5 going into Wheatland.

Another F4 tornado cut a 65-mile swath through a forest and through the town of Lock Haven. The force was so powerful that it shook the ground nearby. Parker Dam State Park still bears the scars from this storm. The most notable tornado of the day in Ontario was the one that hit in Barrie, Ontario.

The outbreak lasted six hours. Seventy-six people lost their lives in the third costliest tornado outbreak in U.S. history. It caused $450 million in damage in Ohio, Pennsylvania, and New York.