Low pressure will quickly intensify over the Plains Saturday evening and night. As it does, a warm front will lift into central Illinois. A mixture of rain and snow will begin late Saturday night, after Midnight, and continue into early Sunday morning. Colder air from the north will settle in over the Midwest bringing widespread, and likely, heavy snow over parts of Iowa and Illinois through Sunday. The overall track of the low is still in question and this will have a major impact on just what precipitation occurs over northern Illinois and southern Wisconsin. A southerly track would suggest more snow locally, but a more northerly track would allow more mild air to move into Stateline, bringing more of a rain/snow mix during the day.
The low will pass to our east Sunday night with temperatures falling below freezing. As this occurs any liquid precipitation would changeover to all snow Sunday night, lasting into Monday morning. While the exact track of the low and heaviest axis of snow are still uncertain at this time, major travel impacts are likely for Sunday afternoon and evening. Those with travel plans need to pay close attention to the forecast in the coming days and may need to think about changing plans if the weather becomes too hazardous. The potential is there for significant snowfall, but the exact location of that snow is less known at this point. As we get closer to Sunday we'll have a better idea on where exactly the snow will fall and be able to pinpoint totals a little more.
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