Sizzling heat wave creates health hazard in southwestern US

June 19, 2017 by Clarice Silber And Josh Hoffner
A man runs through section of South Mountain Park at sunrise to avoid the excessive heat, Friday, June 16, 2017, in Phoenix. A record heat wave is rolling into Arizona, Nevada and California, threatening to bring 120-degree temperatures to Phoenix by early next week. (AP Photo/Matt York)

The Southwestern U.S. is about to feel the wrath of a punishing heat wave that includes a forecast of 120 degrees in Phoenix—a temperature not seen in the desert city in more than 20 years.

The broiling temperatures will also be felt in Las Vegas and Southern California, creating a public health hazard. Rising temps are being closely watched by everyone from airline pilots and emergency room doctors to power grid managers and mountain cities unaccustomed to heat waves.

Even cities accustomed to dealing with 110-degree days are grappling with the new problems that arise from 120 degrees.

Here is a few things to know about the heat wave:



The heat wave, which is expected to peak Tuesday, is forecast to be the hottest weather in Phoenix in decades.

Wunderground Weather Historian Christopher C. Burt said Phoenix temperatures rose to 120 degrees and above only three times in recorded history—twice in 1990 and once in 1995.

Burt said the city has hit 118 degrees 11 times, most recently last summer.

It could be worse: Death Valley could see 124 degrees on Tuesday.



When the temperature soars, it's harder for airplanes to take off.

American Airlines pilot Shane Coffey said extreme heat creates changes in the air density that make it harder for airplanes to take off, meaning pilots have to use more thrust or impose weight restrictions such as flying with less cargo.

Kids play in the fountains at Universal CityWalk, Friday, June 16, 2017, in Universal City, Calif. When bracing for 120 degrees, it's all about the water. Drinking it, splashing in it to stay cool, and drinking it some more. A lot more. That's what officials were urging and residents were planning Friday as a potentially record-shattering heat wave started enveloping the Southwest United States and threatened to bring temperatures of more than 120 degrees to parts of Arizona and California next week. (AP Photo/Mark J. Terrill)

Air density on a 90-degree day in Denver at more than 5,000 feet elevation is similar to a 120-degree day in Phoenix at 1,100 feet above sea level, he said.

In 1990, amid a similar heat wave, flights were cancelled at the Phoenix airport because there was too much uncertainty about how the heat would affect aviation performance. Now, airlines have a better understanding, but the heat is still a concern—primarily for smaller, regional jets.

Airlines will be closely monitoring the heat this week and some flights could be affected.

American Airlines said Monday that it will allow Phoenix passengers flying during the peak heat Monday through Wednesday to change flights without a fee.


110 vs. 120

Residents of Phoenix and Las Vegas deal with 110-degree days fairly often in the summer—but how much more strain does 120 degrees put on the body?

Dr. Moneesh Bhow, medical director for Banner University Medical Center Emergency department, said the body's internal cooling mechanisms are ineffective when temps reach above 110 degrees.

Jennifer Vollmann, 33, plays with her 2-year-old daughter, Izela, in Encanto Pool on Thursday, June 15, 2017 in Phoenix, Ariz. Vollmann, who lives in Phoenix, said her daughter will be back in the pool next week when temperatures are expected to exceed 120 degrees. (AP Photo/Angie Wang)

One of the ways the body cools itself is by radiating heat through the skin into the air, but that system reverses when external temperatures climb to 110 or higher.

"When that happens we have to rely on our second mechanism, which is sweating," Bhow said. Sweat makes your skin feel cooler and some heat is removed as it evaporates.

He noted staying hydrated is crucial to perspiring and staying cool.

The state Department of Health Services says nearly 2,000 people visit Arizona emergency rooms every year because of heat-related illnesses.

Bhow said patients can present with a variety of illnesses—ranging from a simple heat rash to a severe heat stroke.



The heat is a serious public health hazard in places such as Phoenix and Las Vegas where temperatures routinely exceed 110 degrees in the summer months.

Misting machines spray cool water on a patron at a restaurant as temperatures climb to 110-degrees Thursday, June 15, 2017, in Phoenix. Temperatures are expected to hit 120-degrees in the next week. (AP Photo/Ross D. Franklin)

The county that is home to Phoenix had 130 heat-related deaths in 2016, the highest number in more than a decade. It wasn't immediately clear what caused the uptick.

Kate Goodin, epidemiology and data services program manager at the Maricopa County Department of Public Health, said heat-related deaths span the entire Phoenix metro area, but underlying social and economic factors also have an impact.

Homeless people comprised one-third of heat-related deaths in 2016, according to county records. Most of the others involved people with non-functioning air conditioners.

"People who are economically disadvantaged have a harder time paying for increased electricity bills or keeping their water on throughout the entire year and those factors can predispose you to heat-related illness," Goodin said.



People typically flee for cooler mountain climates when it gets hot, but going north won't provide much of an escape this time.

Flagstaff is expected to spend most of the week with highs above 90 degrees, which is so rare many residents don't have air conditioning.

Hikers brave the afternoon sun as the temperatures hit 110-degrees Thursday, June 15, 2017, in Phoenix. Temperatures are expected to climb to 120-degrees in the metro area in the next week. (AP Photo/Ross D. Franklin)
"Extremely high temperatures are a little unusual for northern Arizona," said Coconino County's Deputy Chief Health Officer Mike Oxtoby.

Residents without air conditioners are advised to "pull shades over the windows and use cross-ventilation and fans to cool rooms."

Explore further: Arizona swelters in triple-digit temps as heat wave drags on

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