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Rather cloudy with a t-storm
Partly sunny, showers around
Mostly cloudy with a shower
of sunlight, then sets at
of moolight, then sets at
Following the thunderstorms of early in the week, Philadelphia will see cooler and less humid air persist into the end of July. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.