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Chance of a thunderstorm
Mostly cloudy, a few showers
Sunshine and patchy clouds
of sunlight, then sets at
of moolight, then sets at
Rain will converge along the Atlantic Seaboard this weekend with Boston caught on the edge. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.