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A thunderstorm in spots early
Partly sunny with a shower
Clouds and sun with a t-storm
of sunlight, then sets at
of moolight, then sets at
Thunderstorms will move into the Chicago area later this week, and the threat for storms will remain into the weekend. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.