Bob Martin sent in this photo, snapped during a flight Sept. 25, 2016. He writes: “The fall harvest was proceeding at a rapid pace on Sunday, Sept. 25, in Mason County, Ill. The horizon was filled with dozens of dust devils created by combines chewing up the landscape at a dizzying pace.”
Source: http://generalaviationnews.comPicture of the day: A bird’s eye view of the harvest