Help The Tropical Cyclone Pam Disaster Relief Effort
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An a.m. shower or two; clouds
Cloudy, a t-storm; breezy
A strong afternoon t-storm
Cloudy with a passing shower
of sunlight, then sets at
of moolight, then sets at
After mild conditions bring on a thunderstorm threat at midweek, cooler air will infiltrate 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.