US Heat Dome: Dangerously Hot Weather Grips Nation

A powerful heat dome is anticipated to bring dangerously hot and humid conditions to the eastern United States, marking the most extensive heat wave of the summer. This event follows a significant shift in the jet stream, which is simultaneously causing a cooldown in the West.

Major cities such as Chicago, Detroit, Dallas, and Nashville are expected to reach their highest temperatures of the year. The heat will be exacerbated by humid air surging from the South into the Midwest, eventually spreading eastward to the Northeast by midweek.

The heat index, which accounts for humidity, will climb to hazardous levels, with many areas experiencing "feels-like" temperatures between 100 and 115 degrees. Tens of millions are under a "major" or "extreme" heat risk, according to the National Weather Service, with little overnight relief expected.

Heat is the deadliest weather phenomenon in the US, surpassing tornadoes, hurricanes, and lightning combined. This severe heat wave occurs as the central and eastern US enter their typical hottest period of the year in July and August.

Concurrently, Utah and surrounding states are facing "particularly dangerous situation" red flag warnings due to extreme fire weather. High winds, some gusting up to 50 mph, are intensifying conditions for ongoing wildfires, including the Cottonwood Fire, which remains uncontained and is considered potentially the state's most destructive fire on record.