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Clouds giving way to some sun
Partly sunny and pleasant
Rather cloudy, a little rain
of sunlight, then sets at
of moolight, then sets at
After a stretch of summerlike conditions settled in last week, things will be cooling off a bit this week around Pittsburgh. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.