RELATED VIDEO: A time-lapse of the storms hitting Philadelphia.
The twister was part of a line of heavy storms that hit the area, bringing high winds, hail and torrential rain.
The National Weather Service says the tornado was classified as an EF1, with winds of 85 to 95 miles per hour. That is on the low end of what's called the "Enhanced Fujita Scale," which measures tornado intensity.
Investigators say the tornado struck at 4:40 p.m. and was 1.25 miles long and 200 yards wide.
The view from Chopper 6 HD over Clay Township showed damaged homes and debris scattered over a wide area.
Roofs were torn off, and one home was knocked onto its side.
RELATED: Viewer photos and video of the storm
RELATED: Submit your own photos of the storm
No one was killed. On Sunday night investigators were looking for one person, however they've since learned that person was not home when the tornado hit, and is fine.
Three people suffered minor injuries. No one was seriously hurt.
In all, some 40 homes and other buildings were damaged.
RELATED LINK: Read the report from the National Weather Service.
On Monday, some people could only sift through the debris that was once a home.
Paul Koffroth took his wife and children to visit his in-laws Sunday afternoon. When he returned, he found that his home wasn't damaged. It was obliterated.
Paul says, at that point, there was only one thing he could do.
"I fell to the ground and cried. I just cried," Koffroth said.
Paul's neighbor, Kelley Brower was home with her husband and 16-year-old daughter when the storm hit.
"It started getting black, and then the wind came. We shut the door, and the next thing you know the side of our house exploded in on us," Brower said.
Brower says the most frightening part of her ordeal was when it ended, and she couldn't find her daughter.
"It stopped, we got up, and looked for my daughter. My husband ended up having to dig her out."
She was terrified, Brower says, but uninjured.
Joshua Rader, who lives down the road, says he saw the twister, and can't believe no one was killed.
"It was strong enough to move a 7,500 pound truck, and drag my minivan across the street. There's pieces of these trailers scattered all across the field," Rader said. He adds the prelude to the tornado was a horrible hailstorm, that left a hole in his windshield and a hailstone in his driver's seat.
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