Winter Storm Warning/Watch in effect for the Chicago area – generally along and north of I 88 and I 290 Saturday
UPDATE 9:00 pm
The National Weather Service has upgraded the Winter Storm Watch to a Winter Storm Warning for counties bordering Wisconsin, including Winnebago, Boone, McHenry and Lake counties. The warning will be in effect from 1 pm through 11 pm CDT on Saturday. Snowfall in these counties is expected to range from 5 to 8 inches. The remainder of the Winter Storm Watch area just to the south of the warning area remains unchanged.
A potent storm system is expected to bring a risk for a significant late-season snowfall to parts of the region on Saturday beginning late morning in western most sections and spreading over the remainder of the area in the afternoon and evening in an intense but narrow band. Confidence on where this band will set up remains low, but the potential exists for locations within the Winter Storm Watch (blue shaded counties on map below) to experience a heavy wet snowfall with amounts of 4 to 8 inches.
Rain will spread into Illinois from the west Saturday morning transitioning to a heavy wet snow late Saturday morning in western most sections of the Chicago area – then spreading over the remainder of the area during the afternoon. A heavy wet snow will continue over our area Saturday afternoon into the evening hours giving a total of 4-8 inches of snow.