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File: extreme-heat-southern-california-southwest-maximum-temperatures-2024-09-12.png

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Alternate Text: Map of heat wave showing extremely high daytime temperatures across California, Nevada, and Arizona
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Map of heat wave showing extremely high daytime temperatures across California, Nevada, and Arizona

Image caption

Daytime high temperatures on September 6, 2024, across much of southern California, Nevada, and Arizona, were 100 degrees or more (red). Cooler temperatures (blue, yellow, and orange) mark higher elevations—mountains, buttes, ridges, and the southwest corner of the Colorado Plateau in Arizona. NOAA Climate.gov image using data from NOAA’s Real-Time Mesoscale Analysis (RTMA/UTMA).