Millions of people from the Great Lakes to the mid-Atlantic and Northeast are being blasted by a powerful winter storm that’s producing heavy snow and strong winds that prompted a new Blizzard Warning in Erie,

On Wednesday at 3:29 p.m. an updated winter storm warning was issued by the National Weather Service valid from 4 p.m. until Friday 1 p.m. for Clearfield, Cambria and Somerset counties.

Blizzard conditions loom in some areas. Pennsylvania under warning, New York braces for heavy snow, high winds. Here's what to expect.