|The blue band is Beaver Valley's band of snow|
According to a post on the National Weather Service’s Facebook page, a small band of snow was generated by the Beaver Valley Nuclear Power Plant in Shippingport.This is all in Pennsylvania. It's a new one on me. The Washington Post has more on the story and a video explaining the (rather straightforward) science behind the weather generating nuclear facility.
About an inch of snow fell in the Gibsonia and Wexford area between 4 and 7 p.m.
It’s believed the steam from the plant interacted with the cold, which then caused it to snow.