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Nice with clouds and sun
Sun mixing with clouds
Chance of a thunderstorm
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 midweek. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.