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Excessive heat warnings issued in Arizona
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Excessive heat warnings issued in Arizona

Staff Reports
| The Arizona Republic

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The National Weather Service has issued excessive heat warnings for Maricopa, Pima and Coconino counties until 8 p.m. on July 9.

Dangerously hot conditions were forecast across the state, with temperatures expected to range from 107 to 114 degrees in Pima County and 109 to 117 degrees in Maricopa County.

At the Grand Canyon, dangerously hot conditions were forecast below 4,000 feet, with daytime temperatures ranging from 106 degrees at Havasupai Gardens to 112 degrees at Phantom Ranch.

Temperatures of 105 to 110 degrees were forecast at Lake Powell near Page and Marble and Glen canyons.

Most people would be at risk for serious heat-related illness without effective cooling or adequate hydration, especially if exposed outdoors for extended periods of time, the weather service warned. Overexposure to heat can cause heat cramps and heat exhaustion, and without intervention can lead to heat stroke, the weather service said.

For the latest weather watches and warnings, please check our weather alerts page.

Federal government climate data show the Southwest has become significantly warmer over the past decade. The region has seen the most pronounced warming in the country during that period, an increase that federal meteorologists say clearly reflects the influence of global warming.

In and around Phoenix, developed areas have become significantly warmer than the surrounding desert due to the urban “heat island” effect, in which asphalt, concrete and exposed roofs absorb the sun’s heat and raise temperatures.

In the know: What is the difference between heat stroke, heat exhaustion and dehydration?

Tips for hot weather

The Arizona Department of Health Services has tips to prevent heat-related illnesses:

  • Drinking water: Drink at least 2 liters of water a day if you spend all day indoors. Those who spend time outdoors should drink between 1 and 2 liters for every hour they are outdoors.
  • Dress for the heat: Wear lightweight, light-colored clothing. Sunscreen should always be applied to exposed skin. Wear a hat or umbrella when outdoors.
  • Eat small meals more frequently: Avoid high protein foods that increase metabolic heat.
  • Monitor people at risk: Check your friends, family, or others for signs of heat exhaustion or heat stroke.
  • Decelerate: Perform strenuous activities only during the coolest hours of the day, between 4 and 7 a.m.
  • Stay inside.
  • Take breaks: Take a break in a cool place when exercising outdoors on a hot day.

This article was generated by The Arizona Republic and USA TODAY Network from data released by the National Weather Service. It was edited by a staff member.

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