Wednesday started off with dense fog and it looks like we'll end the day with fog, and drizzle. A warm frontal boundary positioned across central and southern Illinois will slowly march north through the evening and overnight. This will be in response to a weak surface low pressure system that'll move northeast of St. Louis tonight, into northwest Indiana Thursday morning.
The Stateline will remain north of both the low and warm front tonight but the increase in moisture associated with both features will cause an increase in drizzle and light rain showers, along with fog.
The fog could become dense through the late evening and overnight, leading to once again some impacts to the morning commute Thursday. The fog and drizzle may linger for some areas, especially east of I-39, through early afternoon before we likely see a redevelopment of fog Thursday evening and overnight.


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