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Sunny and pleasant
Some rain and a thunderstorm
An a.m. shower; mostly sunny
Sun and areas of high clouds
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of sunlight, then sets at
of moolight, then sets at
An early taste of September will dominate weather headlines around Chicago this week. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.