Several rounds of snow are likely this week, with more impactful snow arriving Monday and then again Friday.
A Winter Weather Advisory has been issued for all of northern Illinois and southern Wisconsin beginning Noon Monday. High pressure has helped clear skies Sunday evening and will keep skies mostly clear during the overnight. Winds will continue to calm Sunday evening, bringing an end to blowing and drifting snow overnight. However, roads may still be a little snow covered and slick through the evening.
Skies will begin clear Monday with temperatures ranging anywhere from 0 degrees to -5 degrees. Clouds will be quick to build in late morning as snow begins as early as 1pm west of line from Monroe to Freeport. Snow will then move from west to east between 1pm and 3pm, covering most of northern Illinois and southern Wisconsin by mid-afternoon.
Temperatures will be in the upper teens and low 20's, meaning that as the snow falls it will quickly begin to accumulate on the roads. Especially any untreated roads. Road conditions will continue to deteriorate through late afternoon and evening as the snow falls. Snowfall rates will be light, but periods of moderate to heavy snow are possible, especially in areas that get a little added lift in the atmosphere from a passing mid-level low pressure system.
Snow totals will range anywhere from 3" to 6" area wide, but isolated amounts closer to 5" and 6" are definitely possible. Right now it appears as if a heavier band of snow may set up over parts of east-central Iowa, extending as far east to parts of Ogle and Lee counties.
Plan accordingly for the commute Monday afternoon and evening as roads may become difficult to travel as the day moves on.
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