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A couple of thunderstorms
A thunderstorm in the area
Partly sunny and humid
of sunlight, then sets at
of moolight, then sets at
Thunderstorms and showers will persist in the Chicago area throughout the week and into the upcoming 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.