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A shower or thunderstorm
Mostly cloudy with a t-storm
A thunderstorm in spots
Partly sunny, warm and humid
Showers and thunderstorms will become more widespread as the holiday weekend progresses, possibly disrupting outdoor activities and weekend plans. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.