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Warmer with a stray t-shower
A couple of morning t-storms
A shower possible
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.