Storms tore through western Pennsylvania on Thursday, flooding basements, downing trees, causing power outages and prompting Allegheny County and Pittsburgh officials to declare a state of emergency.

Three lines of storms produced torrential downpours in the region, with several inches of rain falling in some parts of Allegheny County. Communities just north of the city got 1 1/2 to more than three inches of rain, according to the National Weather Service.

Millvale, on the outskirts of Pittsburgh, had flooded roadways, homes and businesses. Of the 200 homes that were flooded, 25 had water up to the first floor, county Executive Dan Onorato said. Forty-five businesses also were flooded.

Millvale was badly damaged in September 2004 when remnants of Hurricane Ivan caused a creek to overflow. Heavy rains have caused the creek to flood twice this week, including Thursday morning.

More than 50,000 homes and businesses were without electricity Thursday night. By Friday morning, Duquesne Light said it still had about 25,000 customers without power, while Allegheny Power said about 9,500 of its customers were without service.

Both utilities hoped to restore service later Friday, but Duquesne Light spokesman Joe Vallarian said some customers might not have service until Saturday.

Meanwhile, storms nationwide affected passengers at Philadelphia International Airport, leaving many stuck on planes that sat on runways for hours.

US Airways said it canceled 530 flights across the country on Thursday, 133 of them out of Philadelphia, leaving hundreds of travelers stranded.

The airline said bad weather elsewhere created a backlog of planes waiting to takeoff, stranding some passengers on the tarmac for up to six hours. Nearly 30 planes were lined up at one point Wednesday.

Allegheny County’s state of emergency “authorizes emergency operations staff to go out and seek whatever resources are necessary to get the job done — hire contractors, do whatever’s necessary to do and drop the red tape,” said Bob Full, the county’s emergency services chief.

Emergency dispatchers said there were several reports of funnel clouds in the city Thursday afternoon.

At the Carnegie Science Center in Pittsburgh, windows were shattered and siding damaged. There were 800 to 1,000 people at the museum when the storm hit and one girl was treated for a cut on her hand. The science center was closed Friday for repairs.

There were no fatalities or major injuries reported, Onorato said. One person was hospitalized and six people were rescued in the county, excluding Pittsburgh.

In Pittsburgh, sections of some buildings were torn off and several trees were uprooted. About two dozen people in the city were treated for minor injuries, authorities said.

Storm damage also was reported in Beaver and Westmoreland counties.

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