Nature’s oven was on high Tuesday for millions of people in the Midwest and Great Lakes states as baked the regions with no immediate relief before the misery shifts to the eastern U.S.
The National Weather Service was blunt: Conditions were “dangerous” as the heat index, a combination of air temperature and humidity, exceeded 100 degrees in some areas. It warned about a risk for heat-related illnesses, especially among
Detroit’s air temperature was in the high 90s, the Weather Service said, and could even reach 100 at some point through Thursday. The city said a dozen recreation centers were open, some until 11 p.m., for people to cool off. Big chunks of Michigan, as well as Illinois, Ohio, Indiana, Kentucky and much of Iowa, were
The Northeast, including New York City and Boston, will next feel major heat through the . Norristown, Pennsylvania, 20 miles (32 kilometers) from Philadelphia, canceled a Saturday parade because of the weather.
The Chicago History Museum offered free admission to state residents who wanted a cool space Tuesday. Roads in a few places in Illinois buckled under the heat. When the surface has no room to expand in the heat, it can rise and crack.
In Milwaukee, more than 100 firefighters spent hours controlling a fire at a school in the extreme heat. Fire Chief Aaron Lipski said crews were rotating and shedding their thick coats while they rehydrated.

