A tornado did not touch down in Allegheny County and the tornado warning for the county has been lifted, according to Brad Rehak, a meterologist at the National Weather Service.
The weather service has not confirmed a tornado touched down in Lawrence County, although photos showed funnel shaped clouds in the area.
The National Weather Service has extended a flash flood warning for Allegheny County until 11 p.m.
The weather service is receiving lots of damage reports, but has not reported any injuries as of 6:50 p.m.
The weather service said it would continue to monitor the storm and issue another warning if meterologists think it is capable of producing a tornado.
"Some of these storms are rotating," the weatherman said. "We'll have to wait and see."
But according the NWS website, "a confirmed tornado was located near New Castle" around 4:30 p.m., citing information reported by "spotters."
The NWS tweeted: "5:03 p.m. - Significant weakening in the cell that is producing the tornado in Lawrence County."
The weather service recommended avoiding windows and staying in interior rooms on the lowest floor possible.
Alex Zimmerman: email@example.com, 412-263-3909 and on Twitter: @AGZimmerman.