California is struggling to contain huge wildfires burning forests and homes warned Governor Gavin Newsom on Friday as more than 12,000 fire-fighters battle the blazes that have killed six people.
Help is on its way from several US states as Gov Newsom put in a plea for assistance from Australia and Canada.
“These fires are stretching our resources, our personnel,” he said.
Among the 560 fires are some of the largest the state has seen.
More than 12,000 dry lightning strikes started the blazes during an historic heat wave in which thermometers in Death Valley National Park reached what could be the highest ever temperature reliably recorded.
By Friday, emergency officials said some of the fires had doubled in size from the day earlier and have now forced 175,000 residents to flee.
Two of the fires are now the 7th and 10th largest in the state’s history, Gov Newsom said as he urged President Trump to sign a major disaster declaration.
The worst are in the mountains to the south and east of San Francisco.
At least 43 people including fire-fighters have been injured, and hundreds of buildings have burned down and thousands more are threatened.
Many of the blazes are burning on steep, difficult-to-access terrain and have been fuelled by strong winds. The fires are also threatening larger towns including Santa Cruz where flames reached within a mile of the University of California Santa Cruz campus, reports Reuters.
More fire-fighters, engines and surveillance planes are racing in from other states including Oregon, New Mexico and Texas to help. Assistance from what Gov Newsom called “the world’s best wildfire-fighters” in Australia has been requested.
“We simply haven’t seen anything like this in many, many years,” he said, adding that an area the size of the US state of Rhode Island has already burned within California.
With more than 650,000 coronavirus cases, California also has the highest number of infections in the US, and some evacuees have said they are afraid to go to emergency shelters.
One woman told CNN that she was forced to flee to a community centre in Vacaville, but is refusing to go inside for fear of catching coronavirus.
“Not only are we dealing with Covid, but with also the heat and now the fires,” said Cheryl Jarvis, who said she is currently sleeping in her Toyota Prius.
US disaster agencies have updated disaster preparedness and evacuation guidance in light of Covid-19. People who may be required to flee have been to told to carry at least two face masks per person, as well as hand sanitiser, soap and disinfectant wipes.
Emergency shelters are enforcing social distancing rules and mask wearing, and have even given individual tents to families to self-isolate. Some counties are seeking to set up separate shelters for sick evacuees or anyone who is found to have a high temperature.
Officials say people should consider sheltering with family and friends.
In another pandemic twist, officials also advise that people remain indoors due to the poor air quality outside.
California is also facing an electricity strain, which is has caused rolling blackout for thousands of customers. Officials have appealed for residents to use less power or risk further cuts.
In total, over 1,205 square miles (1,950km) have burned across the state.
Satellite images show smoke blanketing nearly all of California, as well most of Nevada and southern Idaho.
Big Basin Redwoods State Park, California’s oldest state park and home to redwood trees that are 2,000 years old, sustained extensive damage to historic buildings.
Fire-fighting teams are stretched thin across the state and have been forced to work longer shifts than usual.
A volunteer fire-fighting corps made up of state prisoners, which has helped the state battle blazes since World War Two, has been diminished this year due to the pandemic.
President Trump blamed California for the fires, and threatened to withhold federal funding as he repeated a suggestion that was met with bemusement when he first raised it in 2018.
Speaking to supporters in Pennsylvania on Thursday, he said he had told state officials: “You gotta clean your floors, you gotta clean your forests — there are many, many years of leaves and broken trees and they’re like, like, so flammable, you touch them and it goes up.”
“I’ve been telling them this now for three years, but they don’t want to listen,” he said. “‘The environment, the environment,’ but they have massive fires again.”