Heat dome forces dangerous temperatures for 70 million in central US

A persistent high‑pressure ridge, commonly called a heat dome, has settled over the central United States, driving temperatures above 100 °F from Texas to the Dakotas. Roughly 70 million people are now under heat advisories or extreme‑heat warnings, with humidity raising the heat‑index into the 110 °F range. The storm‑prediction center notes a low risk of severe thunderstorms but a high risk of heat‑related illnesses. Vulnerable groups—including children, the elderly, outdoor workers and those without reliable air‑conditioning—face heightened danger of heat stroke and dehydration. Many jurisdictions have opened cooling centers and issued public‑health guidance to stay hydrated, limit outdoor activity, and check on neighbors.

The heat dome also strains infrastructure: electric demand surges as air‑conditioners run continuously, prompting concerns about grid overloads, especially in urban heat islands such as Denver, where record temperatures are expected. Forecasters say the dome will remain largely stationary through the week, offering only brief, temporary relief before temperatures climb again. Officials advise continued vigilance and preparedness as the extreme heat persists across the central United States.