A winter storm that brought snow, sleet and freezing rain to a large swath of the Midwest swept into the mid-Atlantic and Northeast on Thursday, causing treacherous travel conditions, prompting school delays and closures and potential power outages for millions of Americans.

A winter storm will bring the Lehigh Valley sleet, snow and freezing rain Wednesday night into Thursday, prompting a winter weather advisory.

Freezing rain could lead to hazardous travel conditions across the entire Chicago area, especially during "peak timing" of the winter weather system.