The first day of summer is ushering a dangerous heat wave in several regions across the United States.
A heat dome, which occurs when the atmosphere traps hot air over an area, like the lid on a pot, is expected to form Friday in the central U.S. and expand to the Midwest and Northeast over the weekend and into next week.
al Weather Service has issued heat advisories or extreme heat warnings for many states in the central U.S. and placed several more eastern states on extreme heat watch. The agency warns that triple-digit temperatures and oppressive humidity could be common throughout next week.
The minimum daily temperatures in parts of the Upper Midwest and Great Plains could set new record highs tonight, while the eastern U.S. could see record temperatures next week, according to the weather service.
Temperatures could exceed 90 degrees Fahrenheit in much of the country to the east of the Rocky Mountains, top 100 degrees in Denver and inch close to that threshold in Chicago, Boston, New York City, Philadelphia and Washington, D.C.