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Fire-fighters are working 72-hour shifts but say it is not enough to contain the blazes
US President Donald Trump has declared that wildfires burning through homes and devastating precious forestry in California are a major disaster and he has released federal aid.
Over 14,000 firefighters are battling 585 fires that have now burnt nearly one million acres (400,000 hectares).
Forecast high winds are threatening to drive flames into more populated areas as foul air blankets the state.
At least six people have died and thousands have evacuated.
Most of the destruction has been caused by three large fire complexes in mountainous and wooded rural areas.
On Saturday, California Governor Gavin Newsom said the SCU Lightening Complex fire south and east of San Francisco is the third-largest in the state’s history.
Video tweeted by the governor showed burnt tree stumps against the reddened fumes-filled sky and plumes of white smoke rising from ash-laden ground.
An evacuation order on Saturday extended to thousands of people in the Bay area near San Jose and warned others to be prepared to abandon their homes at short notice.
Exhausted firefighters continue to battle the flames, with some working 72-hour shifts in the dangerous, hot conditions, reports AP news agency. “They’re scrambling for bodies” to help fight the fires, an official in the city of Fresno told Reuters news agency.
In California’s oldest state park, flames scorched redwood trees that began their lives more than 2,000 years ago. The historic visitor centre of Big Basin State Park was burnt to the ground and officials say some trees, which tower as high as 330ft (100 metres), have fallen as the area was “extensively damaged”.
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Park officials fear that redwoods, the world’s tallest trees, have fallen in the fires
The state faces are more acute shortage of personnel than usual – the coronavirus pandemic has depleted a fire-fighting corps made up of prisoners, which has helped the state battle blazes since World War Two, due to early releases from jail.
At least 43 people including firefighters have been injured, and hundreds of buildings have burned down and thousands more are threatened.
After doubling in size on Friday, the fires continued to grow moderately on Saturday and fire-fighters made some progress in containing the flames.
More than 12,000 dry lightning strikes started the blazes last week during a historic heat wave in which thermometers in Death Valley National Park reached what could be the highest ever temperature reliably recorded.
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Hundreds of buildings have burnt including this historic 157-year old farmhouse
The largest wildfire, called the LNU Lightening complex, is in the prominent wine-growing areas of Napa and Sonoma north of San Francisco and is just 15% contained, CalFire said on Saturday.
Further south in Santa Cruz county, 115 homes have been destroyed and some residents evacuated.
“I left with my clothes… two guitars and a dog,” one evacuee in Santa Cruz told CNN affiliate KGO.
Firefighters dug a fireline around the University of California Santa Cruz campus as flames came within a mile of the buildings and surrounding area.
Gov Newsom has requested help from as far afield as Australia and Canada. Firefighters, engines and surveillance planes raced in from US states including Oregon, New Mexico and Texas.
Although California is used to wildfire, the governor called the fires unlike anything the state had seen before. “If you don’t believe in climate change, come to California,” he tweeted on Saturday.
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Fires have burned through parts of California’s wine-producing regions
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.
US 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.
Here are some key guidelines for protecting yourself against Covid-19 if you must evacuate to a shelter:
- Wash your hands often
- Keep six feet of distance from anyone not among your household
- Wear a face covering when possible, and if possible, wash it regularly
- Avoid sharing food and drinks
- Frequently disinfect your area in the shelter (including toys and electronics)
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.
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Evacuation centres, including at Santa Cruz Beach Boardwalk, must also enforce social distancing rules
Officials also advise people to remain indoors due to the poor air quality outside.
California is also facing electricity shortages, which have caused rolling blackouts for thousands of customers. Officials have appealed for residents to use less power or risk further cuts.
Satellite images show smoke blanketing nearly all of California, as well most of Nevada and southern Idaho.
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