2009: Two rounds of thunderstorms produced strong straight-line winds and very severe hail damage across portions of far northeastern Iowa. The first round struck from just before noon into the early afternoon hours, producing numerous reports of nickel to silver dollar sized hail and 60 to 70 mph wind gusts across the region. A particularly severe swath of golf ball to tennis ball sized hail about 10 miles wide fell across Delaware County extending from near Edgewood to around Sand Springs. Significant crop damage occurred in this swath along with some damage to cars and buildings. The second round of storms struck just a few hours later and was even more severe, producing wind gusts as high as 90 mph and widespread reports of hail 2 inches in diameter or greater with hail as large as softballs falling across parts of Winneshiek and Fayette counties, affecting some of the same areas that had been struck just a few hours earlier. The strong winds combined with the extremely large hail stripped many fields clean of all vegetation, severely damaged cars, and ripped the siding from some buildings. In Fayette and Winneshiek counties alone 65,000 acres of crops were completely destroyed with a much larger area partially damaged.
1993: A line of severe thunderstorms moved from Nebraska into western Iowa at nearly 60 mph during the late afternoon and evening hours. There were numerous reports of wind gusts exceeding 70 mph across the area, including 75 mph winds southeast of Treynor in Pottawattamie County that destroyed several barns and outbuildings. At Council Bluffs 2 inches of rain fell in just 30 minutes resulting in urban flooding. Further east a wind gust to 83 mph was measured at Des Moines.
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This post was written by Schnack on July 24, 2012