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Partly to mostly cloudy
Some sun, then turning cloudy
Cloudy with a little rain
of sunlight, then sets at
of moolight, then sets at
As holiday travelers head home from the Chicago area, conditions will feel colder with the chance of some showers over the weekend. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.