Major windstorms slashed across the center third of Iowa on June 29. Tree and structural damage filled the headlines, but Iowa cornfields suffered as well from a phenomenon called green snap. Green snap is the condition where rapidly growing stalks are broken by strong, sudden winds associated with thunderstorm downbursts. Over one-quarter million corn acres suffered significant green snap from the June 29 storm, based on estimates from field crop specialists.
Iowa State University
White, Michael and Pope, Richard O., "Green snap opinions vary" (1998). Integrated Crop Management News. 2283.