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An afternoon thunderstorm
Showers and a heavier t-storm
A thunderstorm possible
of sunlight, then sets at
of moolight, then sets at
The risk of severe thunderstorms and flash flooding will ramp up quickly for the start of the new week. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.