After reaching the mid-60s Friday, it will be a much more winter-like weekend with highs in the 30s and scattered chances for snow showers. As a broad area of cooler air spreads Southward from the Northern Plains, a narrow axis of moisture will intersect it, developing some snow showers.
The steadiest of these snow showers will be centered along and North of highway 20 in far Northern Illinois up through Southern Wisconsin, but a few light snow showers may be possible as far South as I-88 or even I-80. The timing of snow will be mainly between late morning and early evening.
In total, up to 1-2" may come down across parts of Southern Wisconsin and far Northern Illinois, with a sharp gradient to little/no accumulation further South of Highway 20 and I-88. Impacts to roadways will be somewhat limited due to the warm ground from the 60-degree highs the day before. However, a few slick spots will be possible as temperatures drop into the low 20s and teens Sunday morning.
Another passing system will keep the chill going through Sunday and bring another narrow axis snow showers Sunday night into Monday. Strong high pressure over the Great Lakes will likely limit how much snow may reach this far North, keeping the majority if not all of the snow South of I-80 and into Central Illinois. The large majority of the Stateline will remain dry between Sunday and Monday afternoon.
A pattern change is on the way toward the middle and end of next week. A more Southwesterly flow aloft will force more moisture and warmth our direction, leading to increasing rain chances the later and later into next week you go. While it will not be raining the entire time, pockets of soaking rains with over 1-2" of rain may be possible across parts of Central and Southern Illinois. The Northward extent of the beneficial rainfall is still uncertain this far out. It also comes with a subtle warm up, as temperatures return to the 40s and 50s by Wednesday and Thursday.
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