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A couple of thunderstorms
Warmer with a thunderstorm
Sunny much of the time
of sunlight, then sets at
of moolight, then sets at
Strong and potentially severe thunderstorms will mark the start of the weekend for the Chicago area. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.