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A shower or thunderstorm
A thunderstorm in spots
Sunny and pleasant
of sunlight, then sets at
of moolight, then sets at
After the second 90-degree Fahrenheit day in a row in Pittsburgh, temperatures and humidity levels will ease up heading into the 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.