A third major heat dome in a month is building over the US, and about 70 million people are set to face excessive heat advisories as dangerous temperatures spread from the Gulf of Mexico coast to the Great Plains and the midwest. The hottest stretch is expected to deepen over the weekend and linger into the coming week.
Temperatures of 95-105F, or about 35-40C, are forecast across a wide area, while parts of the south-western US desert could climb to 120F, or 48C. The latest event could also break records in the Denver area, and the National Weather Service has issued an extreme heat warning for western Nebraska, where weekend temperatures are forecast to reach 108F, or 42C.
That scale makes this more than a hot spell. Heat is the deadliest weather phenomenon in the US, and older people, pregnant people, young children and people with existing health conditions are especially exposed when it settles in for days at a time. The danger is not just the peak temperature, but the way it stays elevated through the night and leaves little room for relief.
Andy Pershing said the pattern matches what climate models predicted decades ago. “We are experiencing exactly what the climate models in the 1990s said we should experience now,” he said, adding that the trend means “more frequent, more severe heatwaves, bigger temperature anomalies, more humidity, higher overnight temperatures.”
That is the friction inside the summer heat story. Heatwaves are nothing new in American summers, but they are arriving more often and hitting harder, and this is the third major heat dome event to hit the US in the past month. In early July, one huge heat dome helped cancel some Independence Day events in the east of the country, and another heatwave after that brought 115F heat to Montana and sent records tumbling. The same danger is also unfolding elsewhere, with severe heat and wildfire conditions gripping Europe and parts of the UK, while Heat Dome Weather Traps 70 Million as Dangerous Heat Spreads remains the central concern at home.
For now, the next step is plain: the heat is expected to stay through the coming week, and western Nebraska is already under an extreme heat warning for a weekend peak of 108F. What matters after that is not whether summer will be hot, but how long the country keeps living with heat that behaves less like a spell and more like a system.
