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Partly to mostly cloudy
A t-storm late this afternoon
A shower and t-storm around
Cooler with a little rain
Rain and drizzle possible
Following only limited rainfall during much of May, the weekend will end wet around Philadelphia with a significant cooldown. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.