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Humid with clouds and sun
A thunderstorm or two
Sun and some clouds
of sunlight, then sets at
of moolight, then sets at
Just when it was starting to feel like the dog days of summer again, another push of cool air is taking aim on the Philadelphia area. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.