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Sunny and warmer
A couple of thunderstorms
Rain, then snow late; colder
Sunny and breezy
A morning shower or two
of sunlight, then sets at
of moolight, then sets at
After mild conditions bring on a thunderstorm threat at midweek, cooler air will infiltrate the Chicago area. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.