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A t-storm in the afternoon
Mostly cloudy with a t-storm
Cloudy with a thunderstorm
Sunny to partly cloudy
of sunlight, then sets at
of moolight, then sets at
Following spotty showers and thunderstorms at midweek, warmth will return to the Philadelphia area by 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.