![]() Post titles should exactly match the title on the site they link to. Posts should encourage discussion, not just be a search replacement.Pictures must include subject and location.Controversial topics are limited to regular members of the subreddit.Jet Propulsion Laboratory, Pasadena, Calif.Covering life in and around the Phoenix metro area Rules More information about Suomi NPP is available here: The images were produced from the VNP21IMG Land Surface Temperature product, which is available at NASA’s Land, Atmosphere Near-real-time Capability for EOS ( LANCE). Short for Suomi National Polar-orbiting Partnership, the spacecraft is one of several in the Joint Polar Satellite System. VIIRS is one of five instruments aboard the NOAA-NASA Suomi NPP satellite. ![]() The Verde River and other nearby waterways also were significantly cooler. The hot surfaces in and around the city stand in contrast to nearby irrigated surfaces such as agricultural fields, golf courses, and parks, which fell as low as 68 degrees Fahrenheit (18.9 degrees Celsius) during the night. “That heat gets released slowly at night, making air temperatures much warmer during the nighttime in dense urban areas, creating the classic urban heat island effect.” “Dark asphalt and concrete have a high heat capacity, so most of the heat they absorb during the day goes into storage below the ground,” Hulley said. In the images, the mountains near Phoenix are also notably hot due to their angle to the Sun and greater soil exposure from lack of vegetation. Streets – seen in these maps as a grid pattern – are often the hottest part of the built environment due to dark asphalt paving that absorbs more sunlight than lighter-colored surfaces asphalt absorbs up to 95% of solar radiation. Land-surface temperatures in cities are usually warmer than in rural and undeveloped areas because of human activities and the materials used for building. By those measurements, the city experienced the hottest month on record in July, including a record 31 consecutive days in which the temperature exceeded 110 degrees Fahrenheit (43.3 degrees Celsius). The airport is also where Phoenix takes its official air temperature. Due to their high heat capacity, these surfaces didn’t fully cool overnight before the onset of the next day’s heat, said Glynn Hulley, the JPL climate scientist who produced the series.Īt the center of the images is Phoenix’s Sky Harbor International Airport, where VIIRS measured the hottest land-surface temperature within the city. The images show how built surfaces – roads, buildings, airport runways, and the like – retain heat, sometimes hovering around 100 degrees Fahrenheit (38 degrees Celsius) for hours after sunset.įrom July 1 to July 19, the built surfaces in the maps grew progressively hotter, likely the combined effect of the heat wave intensifying and the cumulative heating of those human-made structures. The data was captured during overnight hours (around 2 a.m.) on several days in July by an instrument called the Visible Infrared Imaging Radiometer Suite (VIIRS) aboard the NOAA-NASA Suomi National Polar-orbiting Partnership (Suomi NPP) satellite managed by the National Oceanic and Atmospheric Administration and NASA. The images reveal the cumulative effect – overnight and across the month – of relentless daytime heating. Researchers at NASA’s Jet Propulsion Laboratory have created a series of maps showing land-surface temperatures in the Phoenix area in July 2023, when the city experienced a record-breaking run of hot weather. Streets and other built surfaces in the region absorbed and retained heat long after sunset and grew hotter over many days of persistent high temperatures. ![]() Unable to cool fully overnight, the surfaces grew progressively hotter through the month. Amid a record heat wave in July, the Phoenix area saw surfaces such as roads and buildings stay hot long after sunset, as documented in NASA-NOAA satellite data that was used to produce this series of maps.
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