Outside of Florida, no state can touch Iowa late in the summer when they get one of their crazy Midwest heatwaves...
Due to a process called Evapotranspiration from all the corn they grow there, it basically sucks up water from the ground like a giant straw and then "sweats" it into the air. Every acre of corn can release up to 4,000 gallons of water a day into the atmosphere and Iowa plants over 13 million acres of corn a year. That's more than 52 BILLION gallons of water being released into the atmosphere just from corn.
Now imagine this process over a week long heat wave with temps above 100 degrees.
There have been several places that recorded DEWPOINTS of 90+ degrees last year which may have broken the all time US record set in Melbourne Florida at 91(a few places reported 93 degree dewpoints). They are still working to get those verified by the meteorological associations for inclusion in the record books.
Also notice how localized it can be around the biggest corn planting locations.
Suffice to say it would feel like you couldn't even breathe if you walked outside in that.
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