Kansas City, Mo., received nearly a foot of snow over in a single day, forcing road and air traffic to come to a halt. NBC News' Maggie Vespa reports why officials are saying it will take a few days to clean out the snow.

Most of the area under the winter storm watch can expect over 8 inches of snow and ice - possibly up to a foot or more - between Saturday and Monday morning.

Here's the latest information on how the system's snow and ice are affecting tens of millions in the central and eastern U.S.