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A thunderstorm in spots
Some rain and a thunderstorm
Partly sunny with a shower
of sunlight, then sets at
of moolight, then sets at
Philadelphia faces not one, but two days of drenching and severe thunderstorms early this week. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.