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Intervals of clouds and sun
Mainly cloudy, a few showers
Some rain and a thunderstorm
of sunlight, then sets at
of moolight, then sets at
Unsettled weather will kick off the week in the Chicago area, threatening outdoor Memorial Day barbecues and picnics. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.