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An afternoon thunderstorm
A couple of thunderstorms
Partly sunny, nice and cool
of sunlight, then sets at
of moolight, then sets at
After only spotty rainfall during the first part of this weekend in the Pittsburgh area, the risk of severe thunderstorms and flash flooding will ramp up quickly by Sunday. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.