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Clearing and much colder
Mostly sunny and warmer
Mostly cloudy, showers around
of sunlight, then sets at
of moolight, then sets at
Tuesday's soaking, wind-driven rain will be replaced by drier weather on Wednesday, but it will be chilly. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.