Update 7:25AM CST Saturday…
The Winter Weather Advisory calling for 3 to 5 inches of snow today remains in effect for the Chicago area westernmost and southernmost counties. Lee and DeKalb Counties in Illinois and Newton and Jasper Counties in Indiana have been included in the updated Advisory as well as additional counties south and east across Indiana into southwest Ohio and eastern Kentucky.
The Chicago National Weather Service Forecast Office has issued a Winter Storm Advisory for 3 to 5 inches of snow Saturday for Chicago area western and southernmost counties from 6AM CST until Saturday evening (6PM to 9PM CST). The Advisory area generally runs along and south of a line from Dixon, Illinois southeast to Fowler, Indiana, and includes the following counties:
Lee, LaSalle, Grundy, Livingston, Kankakee, Iroquois, Ford Counties in Illinois and Benton County in Indiana.
North of that line including most of the counties closer to Chicago all the way north to the Illinois-Wisconsin state line, snowfall totals are initially expected to very gradually taper off the farther north you go with 1 to two inches forecast along the Illinois-Wisconsin state line.
A center of low pressure is projected to move southeast out of Minnesota through central Illinois Saturday – weakening as it curves east up the Ohio River Valley. The National Hazards map below depicts the broad area under Winter Weather Advisory for significant snowfall generally along and north of the low pressure center path that runs from the eastern Dakotas, Minnesota through northeast Iowa into central Illinois.