Phoenix shatters yet another heat record for big cities: 'Intense and unrelenting'

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Phoenix shatters yet another heat record for big cities: 'Intense and unrelenting'
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Tuesday marked 19 straight days that Phoenix, Arizona, had high temperatures of 110ºF or above, and lows not falling below 90ºF. The last time Phoenix broke such a record for daily highs was nearly half a century ago.

What's going on in a metropolitan area known as the Valley of the Sun is far worse than a short spike in temperatures, experts said, and it"Long-term exposure to heat is more difficult to withstand than single hot days, especially if it is not cooling off at night enough to sleep well," said Katharine Jacobs, director of the Center for Climate Adaptation Science and Solutions at the University of Arizona.

No other major U.S. city has had a streak of 110 degree days or 90 degree nights longer than Phoenix, said weather historian Christopher Burt of the Weather Company. "The long-term is the continuation of increasing temperatures in recent decades due to human influence on climate, while the short-term cause is the persistence over the last few weeks of a very strong upper level ridge of high pressure over the western United States," he said.

"Although it is always hot in the summer in Phoenix, this heat wave is intense and unrelenting," Jacobs said."Unfortunately, it is a harbinger of things to come given that the most reliable projected impacts of climate change are those that are directly related to the increase in global temperatures."

Such heat can hit Indian Country particularly hard. Jacobs said about 30% of the population of the Hopi and Navajo reservations lack running water and air conditioning and aren't near cooling centers. That's especially unfair because"tribal members have contributed very little to greenhouse gas concentrations," she said.

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