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Sunny and comfortable
Sunny and pleasant
Mostly sunny and cooler
Rain becoming steadier
Mostly cloudy, a little rain
of sunlight, then sets at
of moolight, then sets at
Warm weather and sunshine will continue to hold into the new week across the Bay Area. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.