Corn sweat is an agricultural phenomenon that makes humidity during a heat wave even worse, especially in states like Illinois where it's a major cash crop.

The National Weather Service issued Extreme Heat Watches and Flood Advisories throughout Illinois. Here's the forecast.

A heat advisory has been issued for all of Chicagoland on Wednesday and Thursday as temperatures and humidity spike.

Farmers at the Champaign County Fair are taking extra measures to take care of their animals at livestock competitions amid the Central Illinois heat wave. In this heat, cows can get heat stress, sometimes causing death.

Dangerous heat continues across northern Illinois through Thursday, with heat indices potentially reaching 105 to 109 degrees. Heat advisories are in effect through this evening area wide.

A sweltering heat wave will take over Illinois Wednesday, with high temperatures in the mid 90s and “feels like” temperatures as high as 110 degrees, the NBC 5 Storm Team said. “Very high heat index levels,

Matt Friedlein with the National Weather Service said shaded areas, like grassy parks or under tree canopies, can be up to 10 degrees cooler than paved surfaces.

Another round of excessive heat is on the way through much of the United States next week, with heat indices predicted to reach 110 degrees Fahrenheit