Meteorologists warn that an expanding heat dome will produce widespread triple-digit temperatures as another weather system raises the risk of damaging winds, flooding, and hail across the eastern United States.
Meteorologists describe a heat dome as a persistent area of strong high pressure that traps hot air near the Earth’s surface. As the air sinks beneath the high-pressure system, it compresses and warms further while limiting cloud formation. The result is several consecutive days of intense heat that can become increasingly hazardous as overnight temperatures remain unusually warm, offering little relief.
A broad dome of high pressure is forecast to intensify across the central United States this weekend, sending temperatures soaring well above seasonal averages while creating dangerous heat conditions across the country for millions of Americans. At the same time, forecasters warn that a separate storm system could unleash repeated rounds of severe thunderstorms from the Midwest into the Northeast.
According to forecasts, temperatures are expected to climb above 100 degrees Fahrenheit across large portions of Texas, Oklahoma, Kansas, Nebraska, South Dakota, North Dakota, and parts of the Mississippi Valley. Some communities could experience heat index values approaching 110 degrees, particularly where high humidity combines with the extreme temperatures.
Although heat domes are naturally occurring atmospheric patterns, scientists note that a warming climate can make extreme heat events more intense, longer lasting, and more frequent.
The prolonged heat also increases stress on electrical grids, agriculture, livestock, and vulnerable populations, especially older adults, young children, outdoor workers, and those without reliable air conditioning. Health officials typically advise limiting strenuous outdoor activity during the hottest part of the day, staying hydrated, and checking on neighbors who may be at greater risk.
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While the central United States bakes under oppressive heat, a separate weather pattern is expected to generate repeated thunderstorms across portions of the Upper Midwest, Great Lakes, Ohio Valley, Mid-Atlantic, and Northeast. Forecasters say these storms may produce damaging straight-line winds, large hail, torrential rainfall, and localized flash flooding, particularly in areas that experience multiple rounds of storms over the same locations.
Although heat domes are naturally occurring atmospheric patterns, scientists note that a warming climate can make extreme heat events more intense, longer lasting, and more frequent. The combination of persistent heat and increasingly volatile weather has become an area of growing research as communities adapt to more frequent weather extremes.
As this latest pattern unfolds, residents across much of the country are being urged to monitor local forecasts and heed any heat advisories, excessive heat warnings, or severe thunderstorm watches issued by the National Weather Service.
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