By Scout Nelson
As the Midwest experiences a late-August heatwave, scientists are noting the role of corn sweat in contributing to the already high humidity levels. “The scientific term is evapotranspiration,” explains Robb Ellis, a meteorologist from The Weather Channel. This process involves the release of moisture from maturing corn plants, particularly during the late growing season.
Evapotranspiration, which occurs with all vegetation, is especially significant in peak corn-producing states like Nebraska, Iowa, and Illinois. Chris Dolce from The Weather Channel highlights that a single acre of corn can release 3,000 to 4,000 gallons of water per day, adding to localized humidity.
While the exact impact of corn sweat on intensifying heatwaves is difficult to quantify, Illinois state climatologist Trent Ford emphasizes that it does play a role, especially at a local level. Most moisture in the atmosphere originates from sources like the Gulf of Mexico, but corn sweat adds to the low-level moisture, raising dew points and exacerbating heat index values.
Iowa state climatologist Justin Glisan adds, “With the large heat dome sitting over the Midwest earlier this week, southerly moist flow increased surface dewpoints, and in the presence of unseasonably hot air temperatures, produced oppressive heat index values.” This local contribution from corn and soybean transpiration intensifies the heat’s impact.
Peak corn sweat occurs during July and August, when the crop tassels and forms grain, making these months particularly challenging for farmers. High humidity not only accelerates the growing process but also makes it harder for people to cool down, increasing the risk of heat illness. Farmers are advised to take breaks and stay hydrated to reduce their risk while working in these conditions.
Photo Credit: gettyimages-dszc
Categories: Nebraska, Crops, Corn, Weather