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Mostly sunny and more humid
An afternoon thunderstorm
A shower and t-storm around
A t-storm around in the p.m.
Shorts, short sleeves and summer attire will be the way to go this week in the Washington, D.C., and Baltimore areas. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.