The National Weather Service has issued a winter storm warning in Baltimore, predicting snow accumulations of 10 to 20 inches. They expect it to begin snowing late Friday and continue through early Sunday morning.
The NFL approved the change on Friday after the City of Baltimore recommended the move, according to the Ravens' Web site. The game was originally scheduled for 1 p.m.
The Ravens, (7-6) are 5-0 against teams with losing records and remain in contention to snare one of the two AFC wild-card slots.
A host of injuries and turnovers derailed the Bears (5-8) after a 3-1 start to the season.
The Associated Press contributed to this story.