Strong winds caused damage in several areas throughout the overnight hours and many people woke up to a coating of snow after Wednesday's spring-like weather.
In Plum, strong winds caused a tree to topple onto a home, crushing its roof. Emergency responders said those living at the Jackson Road house were not hurt.
Another tree fell across some power lines on Earlwood Road Penn Hills. No injuries were reported.
Severe Weather Team meteorologist Stephen Cropper said rain changed to snow between the hours of 3 a.m. and 7 a.m. Thursday.
Drivers who hit the road during the early-morning hours reported slick spots in places, especially bridges and overpasses.
Meteorologist Kevin Benson said up to an inch of snow fell throughout Thursday, causing low visibility at times.
Thursday's temperatures were in the 20s. Snow showers will continue into Thursday night, with an additional inch of snow possible.
The low will reach 14 degrees with a wind chill near zero.
Friday is expected to be much of the same, with a low of 21 degrees and a wind chill near zero.
The threat of flooding has forced the city to close the Mon Wharf to parking. The Ohio River at the point is expected to crest at 19 feet Friday morning. The Wharf begins to flood at 18 feet.
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