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A thunderstorm in spots
Warmer with a thunderstorm
A thunderstorm possible
of sunlight, then sets at
of moolight, then sets at
Warm and humid air will be on the rise into the 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.