While we have seen a few hits of Arctic air so far this winter, Rockford's coldest low of the season was 0° Wednesday morning. After a brief warm-up late in the week, even colder weather will arrive next week. Afternoon high temperatures will struggle to reach out of the single digits Sunday through Tuesday, with overnight lows solidly below zero Sunday and Monday nights.
That is just factoring in the air temperature, though. With the wind chill taken into account, it will feel closer to 20 or 25 degrees below zero at times! Minimum wind chills could reach negative 15° Saturday, then -25° Sunday and Monday. This is just an estimate range of possible outcomes this far out, but it is looking very likely wind chills will reach at least 20 below at times. If we see widespread wind chills near -20°, we could see our first ever "Cold Weather Advisory" issued by the National Weather Service.
This cold air will begin to arrive Friday night and Saturday morning. The timing of that cold air could coincide with some moisture streaming up from the South. This may allow for some wintry mix, including rain and snow, to fall during that time. The exact timing of the two features is still uncertain a few days out, but there is a chance for some wintry precipitation Friday into Saturday before the coldest air arrives Saturday night through Tuesday.
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