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A shower possible
Warmer with a shower
A thunderstorm in spots
A shower and t-storm around
of sunlight, then sets at
of moolight, then sets at
Showers and thunderstorms are in the offing for the Chicago area through the end of the week, in addition to doses of above-average warmth. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.