Widely scattered showers and isolated thunderstorms developed Monday afternoon and evening. These were a result of an upper level low pressure system spinning over northern Illinois and southern Wisconsin. Temperatures at the surface warmed just enough to quickly rise into a fairly cold air mass several thousand feet above the surface of the earth. While not severe, some of the stronger showers/storms did produce brief funnel clouds over Wisconsin, LaSalle County and near the Quad Cities Monday afternoon. None of the funnels touched down.
As we get closer to sunset, the activity on the radar will continue to fizzle with only a few thunderstorms remaining south of Chicago and over east-central Illinois. There will remain only an isolated shower threat into the overnight, but I think we could see locally dense fog develop by Tuesday morning. That may be a bigger issue for the Stateline tonight.
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