The National Weather Service's State College office on Thursday confirmed a tornado with winds reaching 100 mph struck Lancaster County during Wednesday night's storm.
The tornado affected Salisbury Township, located near the Chester County-Lancaster County line. Its path spanned between five and six miles long, according to the NWS report issued at 12:33 p.m.
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The NWS continues to conduct a storm survey to determine more about the storm.
Lancaster Online reported as many as 50 buildings were damaged by the tornado's high winds, and hundreds lost their electricity.
Lancaster County officials said an Amish schoolhouse that was leveled was among the damaged buildings. Most of that damage was near the Chester County border, along a two-mile stretch of Old Philadelphia Pike.
The National Weather Service also confirmed that a tornado touched down near Wyalusing in Bradford County, where several buildings were reported damaged.
Utility crews in central and eastern Pennsylvania still were working to restore power to thousands of customers after the strong storms downed trees and caused minor flooding, The Associated Press reported Thursday afternoon.
There were no immediate reports of injuries or deaths.
The Associated Press contributed to this report.