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Some sun, then clouds
Cooler with rain at times
Some sun with a thunderstorm
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.