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Warmer with a thunderstorm
Clouds and sun
Humid with some brightening
of sunlight, then sets at
of moolight, then sets at
Rain will converge along the Atlantic Seaboard this weekend with New York City caught in the middle. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.