May 3, 2012-10:35 PM.
Mount Lebanon-Allegheny County
The witness was sitting in town and was admiring the building structures. He was looking skyward toward the west-southwest when suddenly there was an explosion of bright white light in the sky.
The witness described what he saw as not a flash or flare. He stated, “this was like a bright milky self-luminescent cloud. It exploded out from a point and expanded to about the size of the full moon and just as quickly collapsed back in upon itself.” The light source then moved laterally a couple of degrees as it was visible. The duration was equivalent to the burst and fading of a fire-work.