PHOENIX — The Latest on the heat wave affecting the Southwestern U.S. (all times local):
The National Weather Service is warning those hiking or sightseeing in southern Utah’s red rock deserts and parks this week that temperatures could reach dangerously high levels.
Forecasters issued an excessive heat warning for southern Utah’s Zion National Park, Glen Canyon National Recreation Area and Lake Powell through Thursday night. Temperatures could reach 115 degrees in some areas.
The Weather Service also warns that temperatures will be very hot this week throughout southeastern Utah, including in Canyonlands National Park, Moab, Blanding, Kanab and Grand Staircase-Escalante National Monument.
Temperatures elsewhere around Utah are expected on Tuesday to tie or break record highs previously set for June 20.
American Airlines has cancelled 38 flights in and out of Phoenix on Tuesday afternoon because of extreme heat.
The cancellations are for operations by smaller regional jets that have lower maximum operating temperatures than full-size airliners. Those jets can’t operate when it’s 118 degrees or above.
American warned passengers over the weekend that it may have to ground flights during a heat wave that could send the temperature soaring to near 120 degrees. Spokesman Ross Feinstein says the late afternoons are the peak affected times.
The airline is letting Phoenix passengers flying during the peak heat Monday through Wednesday to change flights without a fee. The forecast calls for a high of 119 Tuesday.
Extreme heat creates changes in air density that makes it harder for airplanes to take off.
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