Dr Roy Spencer put up a blog post concerning this event.
Read it here. Shows how often derechos hit certain areas of the country and sat image comparison.
http://www.drroyspencer.com/2020/09/derecho-iowa-corn-damage-imaged-by-satellite/
A friend of mine was in that in the BWCA when that happened. He thought he was gonna die. Trees coming down all around him. But his coffee cup never moved off the stump it was on. Crazy!