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Thunderstorms, strong late
Clouds and sun with a t-storm
Colder with a shower
of sunlight, then sets at
of moolight, then sets at
Warm and humid air will be on the rise this weekend with an uptick in storms expected. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.