Winds gusts of 80-100 mph were common as the line of storms moved through the Quad Cities area and then through northwest Illinois. Radio transmission towers in Marion and Clinton, IA collapsed due to winds estimated around 130 mph. Several homes, apartment complexes, and businesses sustained damage consistent with 130-140 mph winds. The Cedar Rapids area was particularly hard hit. The most extreme winds, estimated at 110-140 mph, destroyed or damaged numerous outbuildings, barns, grain bins, homes, mobile homes, apartment buildings, trees, and power poles in parts of Benton, Linn, Jones, Cedar, and Clinton Counties. At this point, storms began to tap into an extremely unstable environment, and began producing more widespread wind damage as they tracked through eastern Iowa. Storms quickly became severe in western Iowa, and produced damaging winds near and around the Des Moines metro. Storms initially developed in northern Nebraska and southeast South Dakota early in the morning, and quickly intensified as they moved eastward into Iowa. There were numerous injuries reported, especially in the Cedar Rapids area. The Linn County Sheriff's Department reports a bicyclist died after being struck by a falling tree. One storm-related fatality occurred in the NWS Quad Cities area of responsibility.
Many locations experienced sustained high winds and damaging gusts for 30 to 60 minutes, compared to 10 to 20 minutes, which is more common for derechos. What is unique about this event, making it even more extreme, is the long duration of the high winds. Two tornadoes were also confirmed within the widespread swath of wind damage, Both have been designated as EF-U (unknown), as there was no observable damage directly attributable to the tornadoes from which an EF-scale rating could be assigned.Ī derecho of this intensity is a roughly once-in-a-decade occurrence in this region. The maximum measured unofficial wind gust was 126 mph at Atkins, Iowa in Benton County. Maximum estimated winds were around 140 mph, which caused extensive damage to an apartment complex in southwest Cedar Rapids, IA. A swath of damage from Benton County, through portions of Linn, Jones, Cedar, and Clinton Counties, is consistent with intermittent straight line winds in the 100-130 mph range. A powerful line of severe thunderstorms known as a " Derecho" tracked across eastern Iowa and northwest Illinois on the afternoon of Monday, August 10th resulting in widespread straight line wind damage.
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