The state's fire service has been battling 15 separate fires across nine counties including Napa, Sonoma and Yuba.
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Some people have tried to save their homes from the flames, which have engulfed some 49,000 acres (28,000 hectares) so far.
AFP
Napa, Sonoma and Yuba make up California's famed wine region, lying to the north of San Francisco.
AFP
At least 1,500 buildings and other property have been destroyed.
Reuters
Aircraft have been used to drop fire retardant
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The California governor has declared an emergency. saying the wildfires "continue to threaten thousands of homes, necessitating the evacuation of thousands of residents".
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This is one of the worst fires in the state's history.
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It has been stoked by a combination of strong winds, low humidity and hot, dry weather.