The storm left thousands without power and caused hundreds of millions of dollars in damage. On Monday, Aug. 10, a powerful weather event known as a derecho devastated parts of central Iowa. Given the central placement of derecho activity in the corn belt, I suspect that these events are made somewhat worse by the huge moisture requirements of corn, which leads to very high dewpoints (oftentimes in the low-80s F) when the corn is actively growing and transpiring water. Shortly after 3 p. m. on June 29, 1998, a powerful long-lived storm complex devastated parts of eastern Iowa packing wind gusts over 100 miles per hour. The August windstorm slammed 3.6 million acres of corn … More than 10 million acres, or 43 percent, of the state’s crops were affected. ... USDA lowered Iowa’s projected average corn yield from 202 bushels per acre in the previous estimate to 191 bushels per acre. Central Iowa Power Cooperative (CIP-CO) sustained heavy damage. We continue to see the damaging impact of the August 10, 2020 derecho and western Corn Belt drought during the last half of the 2020 summer. Corn Belt Power Cooperative sustained little damage with 17 broken poles in its service territory. Flattened corn in Churdan, Iowa. Midwest derecho devastates Iowa corn crop. Satellite imagery shows damage. Any extra water vapor is extra fuel for these storms. USDA production estimates reflect impact of derecho in Corn Belt. Farmers are wrapping up the harvest in much of the Corn Belt and finally seeing how much they can get out of derecho-damaged fields. Other utility sys-tems weren’t so lucky. Farmers are wrapping up the harvest in much of the Corn Belt and finally seeing how much they can get out of derecho-damaged fields. Derecho Hammers Corn Belt climatecrocks.com | 3d A derecho – a dangerous, ferocious wall of wind that’s like an inland hurricane – lashed 700 miles across the Midwest on Monday, flipping cars, downing trees, causing widespread property damage and knocking out power to hundreds of thousands. The storm—known as the Corn Belt Derecho—consistently delivered 70-90 mph winds along its entire track from northeast Nebraska to northern Kentucky. The August windstorm slammed 3.6 million acres of corn in Iowa alone, leaving some stalks almost flat on the ground and many others standing with a pronounced tilt.