ibusinesslines.com July 23, 2017

Arizona is so hot that flights are being cancelled

26 June 2017, 08:17 | Laverne Osborne

Flights cancelled amid searing heat in south-western US

How hot is it in the West? Let us count the ways

Company spokesman Ross Feinstein told AFP the flights were run by two regional partners - Skywest and Mesa - which operate smaller airplanes that can not take off when temperatures reach a certain level.

The weather service has issued an excessive heat warning for the rest of the week.

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

As far north as San Francisco, residents were advised to avoid strenuous activities in the heat, if possible, and don't leave kids or pets in vehicles.

Forecasters are also predicting a high of 116 degrees in Las Vegas and tourists are being warned to be careful outside and to stay alert.

And, of course, the temperature in Phoenix on Tuesday, when the flights were cancelled, was over 118° Fahrenheit.

Phoenix has hit 120 only three times in recorded history.

American Airlines canceled more than four dozen flights in and out of Phoenix Monday due to operational concerns over extremely high temperatures in the desert city. According to a company statement, American Eagle regional flights using the Bombardier CRJ aircraft, which has a maximum operating temperature of 118 degrees, were canceled. Some of the airline's bigger jets, however, have maximum operating temperatures of 127 degrees and remained unaffected by this week's high temperatures. The hotter the air gets, the more it expands and the less dense it becomes.

Part of why the country has been experiencing extremely high temperatures lately revolves around the fact that climate change is affecting the planet more than ever over recent years. Toss in ground temperatures racing past 110 degrees "and things begin to break down". "And let's not forget the effects on ground support equipment and, of course, the people working outside", Smith said.

In addition to grounding more than 40 flights of smaller planes because of the heat, airlines have been taking other measures on larger jets to reduce their weight.

The reason it can get so hot in the Southwest is that the humidity is so low.

Thermal, Calif., southeast of Palm Springs, also set a record for average daily temperature, at 107.5 degrees.

High temperatures also are deadly.

Temperatures were expected to drop by five to 10 degrees later in the week, the NWS said. If temperatures continue to rise, Denver could be facing problems similar to Phoenix.

Sidewalks in many Nevada and Arizona cities were almost abandoned today as residents and visitors adhered to warnings to stay inside to avoid the extreme temperatures.

Julio Ruiz, left, who together with his father runs J.R.R. Roofing, hands a drink to one of his crew members replacing the shingles on house in Tucson, Ariz., Tuesday, June 20, 2017.

- The record-breaking continued Monday with Sacramento hitting 107 degrees, a step hotter than its 106-degree record from 1988.

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