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A full day of sunshine
A t-storm around in the a.m.
of sunlight, then sets at
of moolight, then sets at
Off-and-on showers and thunderstorms will be in the picture for the coming week in Dallas. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.