Right now, there’s a lot of moist air coming up into the American Midwest from the Gulf of Mexico, but another thing is going down as well that’s cranking up the humidity: corn sweat, which is when corn and soybeans and other crops eject moisture as the temperature increases. That moisture is making things sticky, with dew points in the 60s and 70s and heat indices projected to reach 105 to 115 degrees Fahrenheit.
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