Southerly winds increased late Tuesday evening causing some patchy blowing and drifting snow across northern Illinois and southern Wisconsin. Most of this has been occurring in the open and rural areas but some roads - both in the north/south and east/west directions - have experienced drifting. Main roads will probably be okay.
This will cause some patchy slick spots through the morning commute, likely through 8am to 9am as this is when the winds will be at its strongest. Take it slow if you encounter any snow on the road. As a cold front comes through mid-day winds will turn to the northwest. We'll likely see wind gusts back around 20-25 mph which will keep the threat for blowing and drifting snow through the evening.
Temperatures today will warm into the low 30s thanks to a 'warmer' start but will start to drop through the late afternoon and evening. You can already start to see the cold air building across the Upper Midwest and Plains early Wednesday morning, with an even colder air mass further north in Canada. The push of Arctic air will be short-lived, but mighty, as temperatures drop below zero Thursday morning.
Wind chills will sit between -15 and -20 degrees. Highs on Thursday will only warm to the low teens, dropping briefly back below zero Thursday evening before warming above zero Friday morning.
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