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An afternoon thunderstorm
Showers and a heavier t-storm
A thunderstorm possible
of sunlight, then sets at
of moolight, then sets at
After only spotty rainfall this weekend in the Philadelphia area, the risk of severe thunderstorms and flash flooding will ramp up quickly early next week. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.