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A destroyed truck is seen among the ruins of a burned neighborhood after the Carr fire passed through. Photo: Josh Edelson/AFP/Getty Images

With a "heat dome" parked over the Southwest, causing temperatures to skyrocket and drying out vegetation, firefighters are battling more than a dozen large blazes in California alone. The deadliest blaze, known as the Carr Fire, has already claimed 5 lives in and near the city of Redding.

The big picture: With so many large fires burning at once, California's firefighting resources are stretched past the breaking point. Authorities have appealed to other states for help, according to the Los Angeles Times.

  • The Carr Fire continued to expand on Saturday, exhibiting extreme fire behavior and destroying at least 500 structures in and around Redding. According to Cal Fire, the Carr Fire had burned 89,194 acres and was just 5% contained as of Sunday morning.
  • At times, the Carr Fire and other wildfires in California have grown so hot and spread so quickly that they have turned into giant, towering fire whirls, sucking in air from surrounding areas. The flames have been so hot that they've melted high voltage transmission towers into piles of twisted debris.

What they're saying: Unified Incident Commander Chief Brett Gouvea told evacuees from Redding that the fire had grown on multiple fronts Saturday, burning through the footprints of historical fires in Shasta County.

  • “I’ve never seen anything like that happen,” Gouvea said, the Times reported.
Flames from the Carr Fire burns through trees along highway 299 on July 27, 2018 near Whiskeytown, California. Justin Sullivan/Getty Images

The climate context: California's severe wildfire season follows last year's devastating blazes, which ranked as the state's worst fire season on record. Remarkably, the Carr Fire already ranks among the top 20 most destructive blazes in state history. At least 12 of the fires on that top 20 list have occurred since 2000.

  • Though arson, lightning and other factors tend to ignite individual fires, scientific studies have shown that long-term climate change is leading to more large fires as well as longer fire seasons across parts of the West, including California.
  • Part of the reason for this is that the climate warms, spring snowmelt occurs earlier, drying vegetation and making it more combustible. Hotter summer temperatures also favor more frequent extreme fire danger days. In California, intense, multi-year drought has led to large expanses of dead trees, and these are more prone to burning compared to healthy ones.
  • In addition, land management practices and expansion of homes into areas that are traditionally prone to wildfires have also played a role in increasing the destructiveness of western wildfires.

The bottom line: Firefighters face a long battle to get the ongoing fires under control, with plenty of fuel to burn and extremely hot and dry conditions. Traditionally, the peak of California's fire season doesn't hit until late summer and early fall.

Go deeper: See photos of the Carr Fire's devastation.

Go deeper

Tina Reed, author of Vitals
11 mins ago - Health

Health care workers hit new breaking point

Illustration: Shoshana Gordon/Axios

The ranks of health care workers are dwindling and stretching what it means to be reaching their "breaking points," particularly at small nonprofit hospitals.

The big picture: Even as Omicron cases have begun to wane in some places, many hospitals are still fielding a crush of patients amid record employee callouts.

Sarah Palin tests positive for COVID, delaying defamation trial

Sarah Palin. Photo: Matthew Staver/Bloomberg via Getty Images

Former Alaska Gov. Sarah Palin (R) tested positive for COVID-19 on Monday, delaying the start of her defamation trial against the New York Times.

Why it matters: The trial will be closely watched, as it's a rare instance of a major media company defending its editorial practices before an American jury.

S&P 500 slides into correction territory

Data: FactSet; Chart: Axios Visuals

Stocks suffered their worst drop of the year, pushing the S&P 500 on track to fall into a "correction."

Driving the news: The benchmark S&P 500 dropped for its fifth straight day, with losses nearing 3% in early trading.