Under the broiler of this week's heat dome, unshaded streets got up to 122 degrees.
NASA's ECOSTRESS instrument recorded ground temperatures around Las Vegas at 5:23 p.m. on June 10 as a heat wave hit the southwest.Summer in the southwest US is already proving to be a scorcher. Since June 9, Las Vegas, Nevada has been caught in, a kind of atmospheric pressure cooker that superheats air near the ground. Record-breaking heat hit the area, with temperatures consistently soaring to triple digits.
“Even in a place like Las Vegas, which is in the desert, and there’s low tree canopy cover in the first place, you can see that places where there are less trees are hotter,” says, which did a survey of tree canopy and vulnerability to heat in American cities in 2021. Explore data on tree cover, heat islands, and “tree equity” in Las Vegas in American Forests’ tool below:
The Ecostress project is set up to monitor water loss from plants in a warming climate, but it also provides a street-level view of heat waves. The instruments, aboard the International Space Station, specifically target ground temperature over air temperature because it’s typically hotter at the surface. This is reflected in the map’s darker red grid pattern—pavement temperatures even exceeding a broiling 122 degrees Fahrenheit.
“This is basically a Las Vegas street map,” says David. Asphalt absorbs up to 95 percent of solar radiation, which means that the material emits additional heat at ground level where people are walking and living, he explains. “If people are outside, it’s critical that they have some shade.”
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