Lake-effect snow warnings are also in effect through Friday and Saturday for portions of Ohio, Pennsylvania and New York. Lake-effect snow occurs when cold air driven by wind flows over warmer lakes. In the case of this winter storm, the Great Lakes have been experiencing record warmth.

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.