Meteorologists warn that a heat dome will affect tens of millions of people in the eastern United States. On July 23, over 35 million individuals faced major or extreme heat risks, primarily along the Mississippi River Valley. By July 25, that number could rise to nearly 90 million due to forecasts showing a shift eastward. The heat dome phenomenon, where high-pressure air traps heat, leads to prolonged heat conditions, exacerbated by high humidity, making it particularly hard to endure the mid-summer heat.
On July 23 more than 35 million people are at a major or extreme risk of heat effects, according to the National Weather Service.
Current forecasts show the number doubling on July 24 as hot weather shifts eastward, reaching nearly 90 million by July 25.
The miserable conditions are the result of what meteorologists call a heat dome, a weather pattern that occurs when a high-pressure mass of air traps heat.
Heat domes are generally slow to form and slow to dissipate, with conditions expected to continue for a full week at least.
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