First Alert Weather: Bill Explains "Big Boom" - NBC 10 Philadelphia

    First Alert Weather: Bill Explains "Big Boom"

    It was the lightning bolt heard 'round the region, but what, exactly, caused it? NBC10 meteorologist Bill Henley has the answer. (Published Wednesday, Feb 19, 2014) It was the lightning bolt heard 'round the region, but what, exactly, caused it? NBC10 meteorologist Bill Henley has the answer. See More