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Some sun, then clouds
A little morning rain
An afternoon shower in spots
Partly sunny and windy
of sunlight, then sets at
of moolight, then sets at
A southern storm will graze the Philadelphia area with rain during part of this weekend. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.