Earth

NASA Tracks Scorching Heat Wave Over US Southwest

Southwest Heat Wave 2021

While one science instrument mapped the dome of high pressure that settled over the southwestern U.S. in early July, another captured ground surface temperatures.

Just weeks after the Pacific Northwest endured record-shattering temperatures, another heat wave scorched the U.S. Southwest. This heat wave, which started around July 7, tied or broke several all-time records in California, Nevada, northern Arizona, and southern Utah.

Two instruments – NASA’s Atmospheric Infrared Sounder (AIRS) aboard the Aqua satellite, and the agency’s ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS) – tracked the heat wave, providing visualizations of it.

The AIRS instrument captured the progression of a slow-moving heat dome across the southwestern U.S from July 1 to July 12. The animation of the AIRS data (above) shows surface air temperature anomalies – values above or below long-term averages. The hottest areas, shown in pink, experienced surface air temperatures more than 10 degrees Fahrenheit (5.6 degrees Celsius) above average. Surface air temperature is something that people directly feel when they are outside.

On July 8, 2021, NASA’s ECOSTRESS instrument, aboard the space station captured ground surface temperature data over California. Areas in red – including Death Valley – had surpassed 86 degrees Fahrenheit by 7 a.m. local time, well above average ground surface temperatures for the area. Credit: NASA/JPL-Caltech

On July 8, NASA’s ECOSTRESS instrument, attached to the International Space Station, captured ground surface temperature data over California. In the image (middle image), areas in red – including Death Valley – had surpassed 86 degrees Fahrenheit (30 degrees Celsius) by 7 a.m. local time, well above average ground surface temperatures for the area.

On July 9, Death Valley recorded a high air temperature of 130 F, which fell just a few degrees short of the official all-time surface air temperature record of 134 F set in 1913. On July 11, Bishop, California, hit an all-time high of 111 F and Stovepipe Wells, California, set a new record for daily average temperature with 118 F. Numerous other daily, monthly, and all-time records were set throughout the inland areas of central and Southern California and northern Arizona.

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  • "On July 9, Death Valley recorded a high air temperature of 130 F, which fell just a few degrees short of the official all-time surface air temperature record of 134 F set in 1913."

    The question to be answered is, "Why was it hotter in 1913, when CO2 levels were much lower, than in any of the 108 recent years?"

  • The question is whether the temperatures throughout the year are getting hotter. Can someone post the data on that for Death Valley in particular?

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Jet Propulsion Laboratory

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