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Windy; a little morning rain
Plenty of sunshine
Clearing and colder
of sunlight, then sets at
of moolight, then sets at
Chicago will be hit with a winterlike shot of cold air, gusty winds and snow showers into this 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.