Heat dome expands across the central United States, creating dangerous conditions for millions

WASHINGTON (AP) — Temperatures hit sweltering highs across much of the central United States on Saturday as forecasters warned that dangerously hot weather from Dallas to North Dakota would push into next week, with roughly 80 million people facing heat advisories.

A heat dome, where atmospheric conditions trap heat, was forecast to create sustained high temperatures and accumulating discomfort. Meanwhile overnight lows were not expected to come down enough for people to have much chance to recover, allowing heat stress to build as the bad weather lingers, forecasters said. With the high humidity, it feels even worse.

The Utah angle: ‘Abysmal high temperatures’ hitting parts of Utah

The oppressive midsummer weather was forecast to affect a huge stretch of the country, from the desert Southwest to the Gulf Coast and reaching up into the Midwest and Great Plains. Some records around the Denver area could be broken, forecasters said, and temperatures were expected to be 10 F to 15 F (5.6 to 8.3 C) above normal.

“It looks like it is going to be pretty much stationary in that position as we go through the week,” said Bob Oravec, a meteorologist with the National Weather Service.

Hot weather changes plans and makes life harder for those who work outdoors

Places under a National Weather Service extreme heat warning included western Nebraska, where temperatures Saturday and Sunday were forecast to reach 108 F (42 C).

At the Museum of the Fur Trade near Chadron, Nebraska, there were fewer visitors than usual for this time of year. Fur hats and pelts in the gift shop were not selling so hot.

“I’m sure no one would be willing to wear it on a day like this,” museum employee Hannah Lovelace said. Loose-fitting, period-correct fabric shirts, on the other hand, remained popular sellers among folks headed to historical frontier reenactments called rendezvous, she said.

The region’s heat was forecast to continue through the week, with temperatures topping 100 F (37 C) even in normally moderate areas of Montana and Wyoming.

Las Vegas was also expected to see near record-breaking highs. On Saturday, when temperatures reached around 114 F (45 C) in the valley, HVAC repair technician Kristian “Flaco” Santos spent hours outside fixing air conditioning units. His job involves climbing onto homeowners’ roofs or in their attics, where temperatures can be 15 degrees warmer.

“It is brutal,” Santos said, adding that not everyone can work in the heat. “I’m not Superman, but I do, I do take care of myself when I’m in the heat.”

Santos wears long-sleeve shirts and hoodies to protect himself from the sun, drinks lots of water with electrolytes to stay hydrated and takes small breaks to cool down. He encouraged people who work outside to do the same.

“You want to get home to your family safe,” Santos said.

There might be some relief in the central U.S. toward next weekend, but even that might be temporary, Oravec said.

Some areas will be spared. The Mid-Atlantic and Northeast should avoid the extreme heat, as will much of the Pacific Northwest.

This is the latest miserable stretch of weather during a summer that has already had a lot of it. The eastern U.S. endured an unbearably hot early July that forced communities to cancel Independence Day celebrations and disrupted the country’s 250th anniversary. Another heat wave in mid-July hit the Southwest and Great Plains.

It’s not just the United States: A June heat wave devastated Europe, with France recording at least 5,700 more deaths than usual.

On Sunday at the Indianapolis Motor Speedway, fans for the Brickyard 400 will be offered water refill stations and places to get cool, and packed coolers will be allowed. In Denver, recreation centers will set aside areas for people to get out of the heat and in front of air conditioning.

In an already hot year, heat extremes are dangerous

Authorities warned that this heat dome will be dangerous. Children and older adults, along with people with medical conditions, are especially at risk of serious conditions including heat stroke. The basics are important: Seek out air conditioning or a cooling center, and make sure to drink enough water and limit time under the direct sun.

The weather will shift somewhat through the week, with the worst pockets of heat becoming particularly severe across Texas and parts of the Gulf Coast by Wednesday.

It can be difficult to know exactly how climate change contributes to particular events in real time. But rising carbon dioxide levels from burning fossil fuels makes it more likely that hotter weather becomes more frequent and extreme, said Andy Pershing, chief program officer at Climate Central, a climate change communications nonprofit.

“We are experiencing exactly what the climate models in the 1990s said we should experience now. That is more frequent, more severe heat waves, bigger temperature anomalies, more humidity, higher overnight temperatures,” Pershing said. “These are all part and parcel of the climate story.”

The continental U.S. endured the second-hottest first half of the year on record in 2026, according to average temperature tracking by the National Centers for Environmental Information. June itself was the 18th warmest.

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Mead Gruver in Fort Collins, Colorado, and Jessica Hill in Las Vegas contributed.