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Mostly sunny and very warm
An afternoon t-storm or two
Cloudy to partly sunny
Some rain and a thunderstorm
of sunlight, then sets at
of moolight, then sets at
While temperatures will briefly dip by Wednesday, this week will be dominated by summer warmth in the Philadelphia 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.