Thursday's warm temps will plunge dramatically heading into weekend

CHICAGO - Overnight sprinkles are moving out. The rest of the morning and into early afternoon will feature a mix of clouds and sun with highs back into the low/mid 70s.  

Then, the bottom falls out as a cold front zings through accompanied by showers and a gusty wind out of the north. Primetime for showers will be 2 p.m. to 6 p.m.  

Temperatures will plunge into the 40s later tonight and lake-effect rain will develop targeting mainly Cook, eastern Will and Northwest Indiana counties through midday tomorrow.

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Highs tomorrow will be in the low to mid 50s. Tomorrow night into Saturday morning it will be cold enough for a widespread frost away from downtown with the usual cold spots likely reaching freezing. Saturday afternoon with the help of unbridled sunshine, highs should be around 60 degrees.  

Sunday will begin a warmup with highs in the upper 60s with 70+ on the way early next week.