Canceled flights, burning door handles: Heat hits Southwest

Southwest US preps for 120 temps: Water, water, more water

And even though residents in Tucson and Phoenix deal with temperatures reaching 110 degrees quite often in the summer months, the human body just wasn't made to withstand temperatures of 120 degrees or more.

As temperatures climb in Phoenix, Arizona, more than 40 flights have been cancelled - because it is too hot for the planes to fly.

Officials warned of excessive heat across southern portions of Arizona and Nevada, and throughout the 450-mile length of California's Central Valley.

American Airlines said in a statement that the American Eagle regional flights use the Bombardier CRJ planes which can not operate at temperatures above 118 degrees. Airlines can use other strategies for dealing with limitation on the planes during hot weather, such as not fueling completely to make the plane lighter for takeoff, then making a refueling stop.

The weather forecast for the USA city suggests temperatures could reach 120F (49C) on Tuesday.

Surgeons at the major burn center serving Arizona are urging people to be aware of the danger of severe burns caused by excessive heat blanketing the southwestern United States.

Meanwhile, the National Weather Service has extended a heat advisory for the San Francisco Bay Area until 9 p.m. Thursday.

The Southwest will experience a risky heatwave this week with temperatures reaching over a 100 degrees. The weather service had been forecasting Tuesday highs at 120 or 121 degrees in Phoenix for the past several days, but it now predicts 119.

State and local officials are asking people to take the necessary precautions. The record is 122 degrees, set on June 26, 1990.

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. Sky Harbor's runways are long enough to accommodate most planes in hot weather, American Airlines said.

Temperatures elsewhere around Utah are expected on Tuesday to tie or break record highs previously set for June 20. Those jets can't operate when it's 118 degrees or above. I hope everyone takes the risk of unsafe heat seriously and takes advantage of whatever relief options they have.

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