A piece of the polar vortex spills into the Midwest, creating extreme cold for the Chicago area and northwest Indiana for the next few days. For Sunday morning, actual air temperatures will peak early and fall throughout the day.

Chicago faces cloudy skies and potential snow with risks of slick travel conditions and a plunge in temperatures by the weekend.

A weekend snow storm is expected to bring measurable accumulations to the Philadelphia-area during the Eagles playoff game on Sunday. A grand jury in Massachusetts has indicted a doctor who is accused of sexually assaulting more than 200 former patients over a period of more than a decade.

Temperatures will plunge into the single digits by early Sunday, and likely won't rise above the single digits until Wednesday.