In this Wednesday, July 18, 2018 photo, National Weather Service forecaster Marvin Percha reviews monitors that track satellite and Doppler radar images, as well as his colleagues' forecasts posted on social media, at the agency's operating center in Tempe, Ariz. Percha, who grew up in the Phoenix area, says overnight low temperatures at the city's Sky Harbor International Airport have risen over time because of the effect caused by diminishing tree cover and increased development that includes vast amounts of heat-retaining asphalt and concrete. (AP Photo/Anita Snow)
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