PITTSBURGH — A tornado touched down in the city's West End, and high wind and heavy rain damaged the facade of the Carnegie Science Center during the latest spell of severe storms in the area.

After assessing the damage Friday, the National Weather Service determined a tornado hit the West End with top wind speeds of 85 mph a day earlier. A microburst, with similar wind gusts, hit the uptown area of the city, according to the National Weather Service.

The last tornado to touch down in the city was in June 2003 on Mount Washington.

On Friday, crews hosed down streets and homeowners cleaned basements and threw out countless personal belongings ruined by severe storms.

The Carnegie Science Center on the city's North Shore was closed Friday and will remain shut down Saturday for repairs. A large section of the science center's facade was ripped off the building and windows were shattered by Thursday's storms. When the science center reopens Sunday, it will host a presentation on storms.

Idlewild Park near Ligonier also closed on Friday because of lingering power outages.

The widespread damage was caused by three lines of storms that produced torrential downpours in Western Pennsylvania, flooding basements, downing trees and causing power outages.

States of emergency were declared in Allegheny County and Pittsburgh after several inches of rain fell in parts of the county.

One of the hardest hit areas was Millvale. There, 200 homes flooded, with 25 seeing water up to the first floor, county authorities said. Forty-five businesses also were flooded.

Dozens of homes and businesses remained without electricity Friday evening.

Touring the borough on the outskirts of Pittsburgh on Friday, Allegheny County Executive Dan Onorato called for a comprehensive approach to stop the flooding of a creek that regularly happens in Millvale.

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

The Army Corps of Engineers said Friday it would begin dredging the creek and repairing the flood wall next week.

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.