A major winter storm will impact the region this weekend. A frontal boundary will stall south of the Ohio River Valley, with several waves of low pressure expected to track along it. Snow will develop north of the boundary across central Illinois Saturday evening, then continue through Sunday before gradually tapering off late Sunday night. Further south, conditions will be warm enough to support a wintry mix of snow, sleet, and freezing rain south of I-70. By the time the precipitation comes to an end, a widespread 6 to 8-inch snowfall will occur across most of central Illinois. Snow amounts will be a bit lower south of I-70, where 4 to 6 inches of snow and less than one quarter of an inch of ice will occur.