A cigarette, a car backfire: Small sparks can make big fires

Firefighters douse hot spots in the Coffey Park area of Santa Rosa, Calif., on Tuesday, Oct. 10, 2017. An onslaught of wildfires across a wide swath of Northern California broke out almost simultaneously then grew exponentially, swallowing up properties from wineries to trailer parks and tearing through both tiny rural towns and urban subdivisions. (AP Photo/Ben Margot)
Santa Rosa firefighters work on a fire on the side of a road near the Oakmont area in Santa Rosa, Calif., Tuesday, Oct. 10, 2017. (AP Photo/Jeff Chiu)
Fire from a distant mountain is seen from Kenwood, Calif., Tuesday, Oct. 10, 2017. Some of the largest blazes in Northern California were in Napa and Sonoma counties, home to dozens of wineries that attract tourists from around the world. (AP Photo/Jeff Chiu)
A pair of Napa County firemen walk through the remains of the Signorello Estate winery Tuesday, Oct. 10, 2017, in Napa, Calif. Worried California vintners surveyed the damage to their vineyards and wineries Tuesday after wildfires swept through several counties whose famous names have become synonymous with fine food and drink. (AP Photo/Eric Risberg)

SAN FRANCISCO — A carelessly discarded cigarette, a downed power line, a car's backfire or a chainsaw's pull. Just about anything could have started any one of the wildfires now tearing through Northern California, authorities said.

"Every spark is going to ignite a fire," said Ken Pimlott, the state's top firefighter. He said the risk remains "extreme for new starts."

Pimlott said Tuesday that investigators are looking into the causes, but no determination has been made at any of the sites of major wildfires blazing in Northern California. Authorities said 22 were burning Wednesday.

Pimlott, the California Department of Forestry and Fire Protection director, said "98 percent" of all wildfires are started by people and it's unlikely lightning is to blame for any of the fires that exploded overnight Sunday, killing at least 23 people so far.

California's most dangerous wildfire season comes in autumn, when summer heat and insects have left brush dead and dried out, and winds are especially hot, dry and strong.

"This is traditionally California's worst time for fires," Pimlott said.

Pimlott said firefighters typically respond to 300 blazes a week during this season, but nearly all are extinguished quickly and with minimal damage. It's unusual to have many major fires burning at once, he said.

However, conditions were ripe for wildfires in California wine country after record rains last winter created an abundance of dry vegetation, which combined with low humidity and unusually high winds gusting to 79 mph to create fast-moving infernos.

Pimlott told reporters Wednesday that the state was still feeling the effects of five years of drought and that the winter rain was gone, leaving behind critically dry vegetation to fuel fires.

None of the major fires has been contained. They are spread over a 200-mile region north of San Francisco from Napa in the south to Redding in the north, taxing firefighting resources.

Napa County Fire Chief Barry Biermann said fires had been moving too fast and unpredictably for firefighters to attack directly.

"The winds were extremely erratic during those conditions of high winds and a lot of things happened," Biermann said.

He and others said resources are stretched thin as firefighters battle so many major blazes simultaneously.

California Office of Emergency Services Director Mark Ghilarducci said thousands of firefighters, law enforcement officials and others are responding. Airplanes are helping and fresh firefighters from Southern California and Nevada are streaming in to help.

The U.S. Department of Defense is sending a large drone to help map the fires and assess damage. The California National Guard is also providing gasoline to firefighters and other first responders because many service stations in the area are without power and unable to pump fuel.

The biggest and most devastating fire is burning in Santa Rosa, a city of 175,000 people 45 miles north of San Francisco. A fire there swept through several neighborhoods and business districts. Many residents had only minutes to flee. Many of the fatalities so far have occurred in and near Santa Rosa.

Many roads are closed throughout Northern California. California Highway Patrol officers are helping with security at evacuation centers and providing escorts to rescue vehicles traveling in dangerous areas, commissioner Warren Stanley said.

He also had a request for motorists in the area.

"Anybody who is driving around — if you're smoking in your car — please do not throw your cigarettes out the window," Stanley said.

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