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

12 mins ago - Health

The cardiac threat coronavirus poses to athletes

Illustration: Annelise Capossela/Axios

Cardiologists are increasingly concerned that coronavirus infections could cause heart complications that lead to sudden cardiac death in athletes.

Why it matters: Even if just a tiny percentage of COVID-19 cases lead to major cardiac conditions, the sheer scope of the pandemic raises the risk for those who regularly conduct the toughest physical activity — including amateurs who might be less aware of the danger.

President Trump's suburbs

Photo illustration: Annelise Capossela/Axios. Photo: Tom Williams/CQ Roll Call.

President Trump cast an outdated vision of "the 'suburban housewife'" as he swiped this week at Joe Biden's newly minted running mate Kamala Harris — building on his months-long play to drive a wedge through battleground-state suburbs by reframing white voters' expectations.

The big picture: As he struggles to find an attack that will stick against the Biden campaign, Trump for a while now has been stoking fears of lawless cities and an end to what he's called the “Suburban Lifestyle Dream.” It’s a playbook from the ‘70s and ‘80s — but the suburbs have changed a lot since then.

Trump tightens screws on ByteDance to sell Tiktok

Illustration: Aïda Amer/Axios

President Trump added more pressure Friday night on China-based TikTok parent ByteDance to exit the U.S., ordering it to divest all assets related to the U.S. operation of TikTok within 90 days.

Between the lines: The order means ByteDance must be wholly disentangled from TikTok in the U.S. by November. Trump had previously ordered TikTok banned if ByteDance hadn't struck a deal within 45 days. The new order likely means ByteDance has just another 45 days after that to fully close the deal, one White House source told Axios.