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Clouds giving way to some sun
Sun mixing with clouds
Some rain and a thunderstorm
Noticeably cooler Saturday
The next round of rain for the Washington, D.C., and Baltimore areas will be at the end of the week into the start of the weekend. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.