Heat dome brings dangerous temperatures to 70 million across central US
Heat advisories covered roughly 70 million people as temperatures climbed past 100 degrees from Dallas to North Dakota, raising risks for hospitals, grids and workers.
Dangerously hot weather will expand across much of the central United States this weekend and into next week, pushing temperatures above 100 degrees Fahrenheit from Dallas to North Dakota and leaving roughly 70 million people under heat advisories.
A heat dome forms when a stubborn high-pressure system traps hot air over a region, allowing temperatures and humidity to build day after day. That kind of pattern is especially dangerous because relief can remain limited even at night, when many households depend on cooler air to recover. Hospitals and emergency responders typically see the strain first, then power systems, as air-conditioners run constantly and outages become more costly.
Older adults 65 and older face elevated risk during extreme heat, along with people without reliable air-conditioning, outdoor workers, athletes and residents with preexisting health conditions. In cities, the urban heat island effect can keep neighborhoods hotter for longer and prevent temperatures from dropping enough overnight.
Local and state governments usually respond with cooling centers, heat advisories, extended pool hours and warnings to cut back on outdoor activity. Schools and workplaces may also alter schedules, but those measures often depend on how quickly local agencies can open air-conditioned spaces and reach people who are already exposed outside. The danger is especially sharp for workers on roads, farms, construction sites and delivery routes, where long hours in direct sun can push body temperatures up fast.
A June 30 Climate Central alert found human-caused climate change significantly increased the likelihood and intensity of the late-June and early-July heat wave. World Weather Attribution published a July 3 report titled Fossil Fuels Are Heating America’s 250th Birthday. On one Thursday during the Fourth of July heat wave, more than 160 million people were under heat alerts (NBC News, July 4).
Federal guidance includes tools like the National Weather Service HeatRisk and CDC extreme-heat advice. The immediate protections are water, shade, air-conditioning and checks on vulnerable neighbors.
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