Heat radiates across Southwest; Death Valley hottest

  • A jet comes in for an approach over downtown early Tuesday, July 24, 2018 in Phoenix, as temperatures exceed 100 degrees in the morning hours. Much of Arizona and parts of California, Arizona and Utah are under an excessive heat watch during a week that forecasters say could prove to be the hottest of the year. (AP Photo/Matt York)

  • A biker hits the trail at dawn to beat the heat Tuesday, July 24, 2018 in Phoenix. Much of Arizona and parts of California, Arizona and Utah are under an excessive heat watch during a week that forecasters say could prove to be the hottest of the year. (AP Photo/Matt York)

  • A hiker walks past a heat warning sign at dawn, Tuesday, July 24, 2018 in Phoenix. Much of Arizona and parts of California, Arizona and Utah are under an excessive heat watch during a week that forecasters say could prove to be the hottest of the year. (AP Photo/Matt York)

PHOENIX — Scorching heat radiated across the U.S. Southwest on Tuesday, with the highest temperatures expected in California’s Death Valley during a week that forecasters say could prove to be the region’s hottest this year.

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