One disruption caused by Friday's fast moving weather in the Butler County resulted from this tree falling across Route 356 in Summit Township. The road was closed until a crew could remove the debris. The incident was reported at 4:44 p.m.

Although the most intense part of Friday night's thunderstorms did not last long, it was intense enough to topple trees and knock out power in the southern half of Butler County.

Butler County Emergency Services fielded at least 50 phone calls between 4:30 and 6 p.m., according to its online records, including numerous reports of utility wires down, but few of those incidents were north of Butler.

Wind felled trees that downed lines in Butler and Saxonburg as well as Clearfield, Summit, Middlesex, Jackson and Adams townships, resulting in scattered electrical outages.

The storm, however, did not affect the Butler or Mars high school proms.

At Butler County Community College in Butler Township, the Butler promenade from the Field House to Founders Hall at 7 p.m. occurred after the worst of the storm had passed.

Students and guests at the Mars prom only had to deal with minor sprinkles when meeting at the high school auditorium to be shuttled to the Omni William Penn in Pittsburgh.

West Penn Power reported about 50 county customers still without power at 9 a.m. Saturday. Representatives for the utility could not be reached Saturday morning to determine the extent of its outages in the county on Friday night.

Residents of Butler and Penn Township at least were affected by electrical outages, and city firefighters confirmed their North Washington Street fire station had to rely on its backup generators for a few hours.

No members of Parker-based Central Electric Cooperative lost power Friday evening, according to Christina O'Donnell, director of communications for CEC, which has about 9,300 members in the county.

According to Butler fire Capt. Kevin McAfee, the department only responded to two “significant” calls Friday evening. The first involved a tree falling onto a pizza delivery driver's car on Hazel Avenue.Fran Strobel had just received her pizza about 4:40 p.m. when she heard a tree fall on the delivery woman's car.“Her car was totaled,” Strobel said, adding that emergency responders cleared the area by 7:30 p.m.Butler firefighters also cleared a second downed tree along West New Castle Street, that struck an unoccupied car and part of a house.Mercer Road volunteer firefighters and Butler Township police responded to another incident of a tree falling onto a car, this one at about 5 p.m. on Route 8 near Route 422. The roof of that car was caved in, but it was not immediately known if anyone was injured.Chief Bill Hayes of the Adams Area Fire District said that besides a large tree that fell on Downieville Road about 4:30 p.m. and had to be cut up, the storm caused no serious incidents in the area.“It was just a lot of downed power lines and trees onto the power lines,” Hayes said.Chief Dave Metz of the Middlesex Township Volunteer Fire Company said the most serious incident his department encountered was a tree down at the intersection of McFann and Sheldon roads.“Other than that, we were quiet. It was just minor damage, so I'm happy,” he said.

Brianna Beck and Kaleb Trudeau make their way into Mars High School for the prom walk Friday amid minor sprinkles after a storm moved through the area. The Butler High School promenade at Butler County Community College took place Friday after the worst of the storm had passed.