A significant winter storm remains on track to impact northern Illinois on Saturday, with the National Weather Service warning that the heaviest snowfall will fall in a concentrated window between noon and 8 p.m. Forecasters continue to call for 6 to 10 inches of snow across the region, with locally higher totals possible northwest of a line from Ottawa to Aurora to Waukegan.

The Winter Storm Warning runs from 3 a.m. Saturday through 6 a.m. Sunday. The most disruptive conditions will arrive after late morning. Snow will begin to increase in intensity after sunrise, but by midday, snowfall rates could reach 1 inch per hour or higher, creating rapidly deteriorating travel conditions through the afternoon and early evening.

In the Sauk Valley and Bureau County areas, the warning begins at

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