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Variably cloudy, a t-storm
Humid with periods of sun
Thunderstorms, strong late
of sunlight, then sets at
of moolight, then sets at
Chicago will become the target of severe thunderstorms as the Labor Day holiday weekend comes to an end, creating dangers for those with outdoor plans. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.