Red flag warnings issued as dangerous heat descends on California and the Southwest
In response, officials opened cooling centers in Los Angeles this week, where residents are warned to avoid strenuous outdoor activities.
California Governor Gavin Newsom has also ordered state firefighting resources to be deployed across areas where blazes could ignite.
Here's what you need to know.
Sizzling hot
The National Weather Service issued an extreme heat warning for Southern California from Wednesday and into the weekend. If outdoor activities can't be avoided, forecasters say, they should be moved to early morning hours. And everyone should hydrate.
Downtown Los Angeles was forecast to reach 94 degrees Fahrenheit (34 degrees Celsius), while valleys to the north braced for temperatures as high as 108 F (42 C). It will be several degrees hotter in desert areas.
Candice Catlett, who uses a wheelchair, rolled herself toward some shade as temperatures started spiking Tuesday in downtown LA.
'It's sizzling hot out here,' Catlett said. 'I have sunblock. Hopefully, I can find some cold water. I'm trying to stay out of the direct sun.'
Further north, nearly-always-hot Death Valley could see a severe 120 F (49 C), the weather service said.
In Arizona, the peak of the heat wave will hit Thursday and Friday, with the mercury possibly reaching 110 F (43 C) in the southern and western parts of the state. Similar temperatures were likely in Las Vegas.
Red flag warnings, signaling elevated wildfire danger, have been issued across Los Angeles, Ventura, Santa Barbara and San Luis Obispo counties until Saturday.
'If you live in a high fire danger area in the mountains or foothills, review your evacuation plans and route and stay tuned to your local emergency officials,' the weather service said in a statement.
The state has sent 10 fire engines and multiple firefighting teams to LA County to assist local agencies if blazes break out.
'By prepositioning firefighting crews, equipment, and other resources in high-risk areas, we can respond faster and more effectively when needed," said Nancy Ward, director of the Governor's Office of Emergency Services.
In the Sierra Nevada, higher than normal temperatures, low humidity and the possibility of lightning storms will contribute to the fire risk.
California's largest blaze this year, the Gifford Fire, reached 95 percent containment Tuesday after charring nearly 206 square miles (534 square kilometers) of San Luis Obispo and Santa Barbara counties since erupting on August 1. The cause is under investigation.
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