The first day of summer broughtsome of the worst heat the south-west USA has seen in years, forcing flights to be canceled, straining the power grid and making life miserable for workers toiling in temperatures that could reach 120F in Phoenix.
Regional flights on American Eagle were the most affected, because they use Bombardier CRJ planes that can only operate at temperatures of 118 degrees or below, Feinstein said.
In Phoenix, Arizona, state weather service forecast the mark 120 degrees in the desert city along with risky heat waves that can cause health hazards in the region along with the whole southwestern part of the country. More than 29 million residents in California are under a heat warning or advisory.
"It's physically impossible for those individuals to carry enough water", said Border Patrol Agent Vicente Paco, patrolling near the Mexican border in the Sonora Desert south of Tucson.
She says it's hard to predict exactly how hot the Strip will get because the weather service does not get official readings there, but temperatures could reach somewhere between 115 and 120 degrees despite the city's airport forecast to hit 114 Monday.
Workers at a construction site in a Phoenix suburb huddled under the shade of an excavator during a break. The forecast called for a high of 120 degrees in Phoenix, 119 in Palm Springs, California, and 126 in Death Valley.
Some smaller regional jets can not take off in temperatures hotter than 117 degrees, it said in a statement.
Several utilities warned of blackouts, Phoenix aid workers checked on the vulnerable, fire crews battled wildfires in Utah and California, while in Arizona it was literally too hot to fly.
Salvation Army volunteers Evangeline Ford, left, and Jackie Rifkin, right, restock a cooler with bottles of water at a hydration station for people as they try to keep hydrated and stay cool as temperatures climb to near-record highs, Monday, June 19, 2017, in Phoenix.
"We are expecting temperatures in the neighborhood of 120 degrees in Nevada and in southern California today", Bianca Hernandez told AFP.More news: Camden evacuate tower block over 'safety fears' following Grenfell fire
"Your house stays hot, buildings stay hot".
"We have homeless people come from a long way to sit here", said longtime volunteer Moses Elder.
People cross Las Vegas Boulevard as the sun beats down, Tuesday, June 20, 2017, in Las Vegas. Running a fan through wet material can actually act like an air conditioner when the humidity is this low!
San Jose sweltered in record-breaking, 103-degree weather on Sunday, and the area is under heat advisory until 9 p.m. PT Thursday.
Authorities say people should avoid the outdoors and be in air-conditioned buildings during the heat wave.
With high temperatures in the Phoenix area expected to remain around 118 degrees on Wednesday, travelers in the area should expect further cancellations.
The first day of summer brought some of the worst heat the southwestern US region has seen in years.
And while it's not almost as hot in DFW, the heat will be coming. They said on Twitter that it's "like your skin and flesh are burning off".
"That's deadly heat no matter how you slice it", weather service meteorologist Chris Breckenridge said.