The fires that began on Sunday in the famed Napa-Sonoma wine country north of San Francisco came on the third anniversary of deadly wildfires that erupted in 2017, including one that killed 22 people.
The latest inferno began with the Glass Fire at 3.50am on Sunday and two subsequent fires merged with it, burning 44 square kilometres as of early Monday, according to the California Department of Forestry and Fire Protection, or Cal Fire.
Officials did not have an estimate of people under evacuation but Paul Lowenthal, Cal Fire spokesman, said more than 13,000 homes were threatened in Santa Rosa alone. He estimates tens of thousands of people are under evacuation warnings or orders.
“In some parts of Santa Rosa, they’re mopping up hotspots,” he said. “In other parts, they’re still actively fighting fire.”
Sonoma County Supervisor Susan Gorin evacuated her home in the Oakmont community of Santa Rosa about 1am. She is rebuilding a home damaged in the 2017 fires. Gorin told the San Francisco Chronicle that she is numb, and the situation feels surreal.
“It’s like God has no sympathy, no empathy for Sonoma County,” she told the news publication.
Numerous studies in recent years have linked bigger wildfires in America to global warming from the burning of coal, oil and gas, especially because climate change has made California much drier. A drier California means plants are more flammable.
Evacuations were also ordered in Shasta County as the Zogg Fire spread over 59 square kilometres. Residences are widely scattered in the forested area, about 16 kilometres south-west of the city of Redding in a region torched just two years ago by the massive and deadly Carr Fire – infamously remembered for producing a huge tornado-like fire whirl.
The causes of the new fires were under investigation.
The fires erupted as a giant ridge of high pressure settled over the west, producing powerful gusts blowing from the interior toward the coast while slashing humidity levels and raising temperatures, making vegetation ready to burn.
During the weekend, Pacific Gas & Electric turned off electricity to targeted areas where the winds raised the potential for arcing or other power equipment damage that could spark new fires. The utility’s equipment has caused previous disasters, including the 2018 Camp Fire that devastated the Sierra Nevada foothills town of Paradise and killed 85 people.
So far this year, more than 8100 California wildfires have scorched 14,970 square kilometres, destroyed more than 7000 buildings and killed 26 people.
Most of the losses occurred after a frenzy of dry lightning strikes in mid-August ignited a massive outbreak of fires.
Fire worries were also developing on Monday across Southern California although it was unclear how strong predicted Santa Ana winds would be. Heat and extreme dryness were expected to be problematic nonetheless.
Conditions were also hot, dry and windy in parts of Arizona, where the Sears Fire in Tonto National Forest north of Phoenix has grown to more than 36 square kilometres since it erupted on Friday afternoon. Authorities reported zero containment.
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