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Partly to mostly cloudy
Partly sunny and nice
Partly sunny with a t-storm
of sunlight, then sets at
of moolight, then sets at
Following the thunderstorms of early in the week, the Nation's Capital will see cooler and less humid air midweek. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.