The hottest weather of the summer is poised to spread across much of the central and then eastern U.S. over the next several days.
Several cities are likely to see their highest temperatures of the summer so far, including Chicago, Detroit, New York City and Washington, D.C., according to the Weather Channel. Many spots are forecast to approach 100 degrees over the next few days.
Factoring in the heat index, temperatures will be even more brutal: "Friday will be suffocating across much of the eastern U.S., with the heat index 100 degrees to 110 degrees from the Plains to the Great Lakes and the Middle-Atlantic to NYC," BAM Weather meteorologist Ryan Maue tweeted.
The heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature.