California searches for 1,000 missing in its deadliest fire

The disaster already ranks among the deadliest U.S. wildfires since the turn of the last century. Eighty-seven people perished in the Big Burn firestorm that swept the Northern Rockies in August of 1910. Minnesota's Cloquet Fire in October of 1918 killed 450 people.

Authorities attribute the Camp Fire's high death toll partly to the speed with which flames raced through the town with little advance warning, driven by howling winds and fueled by drought-desiccated scrub and trees.

Weather conditions have since turned more to firefighters' favor, though strong, gusty winds and lower humidity were expected to return late Saturday through early Sunday, ahead of rain showers in the forecast for mid-week.

The rain is good news for fire crews but will add to the misery of evacuees camping outdoors, including at least 300 people living in a tent village that sprang up in the parking lot of a Walmart store.

That spot lies in a flood plain, so occupants are being urging to vacate the parking lot by Sunday afternoon, said Bryan May, a spokesman for the California Office of Emergency Services.

Outbreak of the Camp Fire coincided with a series of smaller blazes in Southern California, most notably the Woolsey Fire, which is linked to three fatalities and has destroyed at least 500 structures near the Malibu coast west of Los Angeles. It was 78 percent contained on Friday night.

Scientists have said the growing frequency and intensity of wildfires in California and elsewhere across the West are largely attributable to prolonged drought that is symptomatic of climate change.

The precise causes of the Camp and Woolsey Fires were under investigation, but electric utilities have reported equipment problems in the vicinity of both blazes around the time they erupted.

U.S. President Donald Trump, who has taken to Twitter to blame the recent spate of fires on forest mismanagement, was due to visit the fire zones on Saturday to meet displaced residents. Governor Jerry Brown and Governor-elect Gavin Newsom planned to join Trump on his tour.

Smoke from the Camp Fire has spread broadly. Public schools in Sacramento 90 miles (150 km) to the south, and as far away as San Francisco and Oakland, canceled classes on Friday because of poor air quality.