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Fog in the a.m.; mostly sunny
Mostly sunny, warm and humid
Partly sunny and very warm
of sunlight, then sets at
of moolight, then sets at
A turn to warmer conditions is in store for the Chicago area heading into the new week. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.