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A strong t-storm in spots
Mostly sunny with a t-storm
A shower and t-storm around
of sunlight, then sets at
of moolight, then sets at
The big picture for the Philly metro area will be the return of warm and humid air, along with spotty showers and thunderstorms. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.