After a quiet weekend with the influence of high pressure, an active pattern will take hold next week. A strong low-pressure system will slide through the Central U.S. Tuesday into Wednesday, bringing with it the potential for heavy rain, thunderstorms, and even snow. The low pressure will pass directly over Northern Illinois, so we may be in for a little bit of everything.
Initially, soaking rain will be possible starting Monday night and Tuesday morning. Periods of steady to moderate rain will then be possible through Tuesday night. As colder air arrives Wednesday afternoon, there may be a window for precipitation to flip over to snow. The heaviest snowfall accumulation will remain Northwest of the low pressure's track and out of the Stateline. That said, we will likely still see some snow during the second half of Wednesday, with lighter accumulations possible. This system will also bring strong winds, initially from the Southeast Tuesday ahead of the low pressure's center, then Northwest Wednesday afternoon and evening.
In total, there may be a few spots that see precipitation amounts exceed 1" between Tuesday and Wednesday. This would be from rainfall and any melted snow. With the ground still somewhat frozen, there may be a small concern for isolated flooding in low-lying areas where the heaviest rain falls. Things will dry back out a bit for Thursday before another system arrives late-week.
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