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A thunderstorm in spots early
A thunderstorm in spots
A t-storm around in the p.m.
of sunlight, then sets at
of moolight, then sets at
An increase in moisture from the Southwest monsoon will fuel showers and heavy thunderstorms across the interior West through 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.