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A shower or thunderstorm
Warmer with a thunderstorm
A couple of thunderstorms
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.