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An afternoon thunderstorm
Strong t-storms, mainly later
A thunderstorm possible
of sunlight, then sets at
of moolight, then sets at
After a rain-free weekend, the risk of severe storms and flash flooding will ramp up quickly for 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.