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Snow possible in the morning
Cloudy with a touch of rain
Periods of snow and rain
of sunlight, then sets at
of moolight, then sets at
Philadelphia will experience a taste of spring before colder air and a possible storm arrives at midweek. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.