UPDATE TO THE STORY BELOW: My Brother Ed is a spray pilot and took the above photo from his Ag-Cat turbine. That's our house in the background. Some backwaters of the Missouri River to the rear. If you enlarge the photo you can see some of the sand deposits left by the river from last years flood. The light colored area is where the green snap occurred.
Green snap (corn snapping off near the ground) can be found mostly in corn that has reached it's maximum height and is a result of thunderstorms. This affects only about 15 acres of my crop but I've seen entire hillsides leveled by this type of down burst in other areas.
Our local area has a lot of green snap but it's all across the Missouri River from me, and on east, where they received some good rains. I got the wind but not much of the rain.