By Aaron Wilson
Midwest Derecho
On Monday, August 10, 2020, a powerful weather system is known as a derecho (pronounced “deh-REY-cho”) impacted nine states from South Dakota to Ohio (Figure 1). The National Weather Service defines a derecho as a long-lived windstorm that produces widespread damage like a tornado but in one direction along a straight path or “straight-line wind damage.” Last week’s derecho was exceptionally damaging to agricultural interests, particularly in Iowa. Numerous reports of winds stronger than 70 mph were noted with an unofficial gust to 106 mph at Le Grand. According to the Iowa Soybean Association, the latest USDA reports suggests 14 million impacted crop acres with $6 billion in liability losses. Only minor damage was reported in northwest Ohio as the derecho weakened below severe limits Monday evening, but it brought a decent round of rainfall to the area. The last major derecho to occur in Ohio was on June 29, 2012, which brought 22 fatalities from Illinois to the Mid-Atlantic and $2.9 billion in losses.
8-10-20 Derecho Map
Figure 1: Preliminary storm reports associated with the August 10, 2020 derecho.
Continue reading Derecho Devastates the Midwest While Ohio’s Dry-Weather Pattern Continues