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Showers and a heavier t-storm
Clouds breaking and breezy
Times of clouds and sun
of sunlight, then sets at
of moolight, then sets at
Chicago is facing the threat of some disruptive thunderstorms on Saturday. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.