Nature's oven was on high Tuesday for millions of people in the Midwest and Great Lakes states as intense heat and humidity 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 Fahrenheit (37.8 degrees Celsius) in some areas. It warned about a risk for heat-related illnesses, especially among people without air conditioning.
