National Weather Service United States Department of Commerce


Widespread, destructive straight line winds blew across central Iowa during the day on August 10, 2020. The highest official wind gusts measured was 99 mph at the Marshalltown Airport with an unofficial wind gust of 106 mph at Le Grand (east of Marshalltown). The strongest winds were between the Highway 30 and Interstate 80 corridor (including, but not limited to the Des Moines metro, Ames, Newton, Marshalltown, Tama/Toledo, Carroll) from central Iowa eastward into east central Iowa and northern Illinois.       Last update: March 30, 2022 4:46 a.m. CDT


StoryMap -  August 10, 2020 Midwest Derecho


Other NWS Office Event Summaries:

NWS Quad Cities  |  NWS Chicago  |  NWS Milwaukee

NWS Central Illinois  |  NWS Northern Indiana  |  NWS Indianapolis


Wind Gusts Greater than 70 mph in NWS Des Moines' area of responsibility

Location Wind Gust (mph) Source
2 WNW Le Grand 106 Personal Weather Station
Marshalltown Airport 99 ASOS
2 S Marshalltown 95 (Estimated) Storm Chaser
Marshalltown (US 30) 91 Iowa DOT
3 S Chelsea 90 (Estimated) Trained Spotter
0.6 W Elkhart (UPR) 85 Mesowest
1 W Urbandale 85 Personal Weather Station
Neil Smith NWR 85 RAWS
2 ESE Jefferson 83 Personal Weather Station
1 N Des Moines Int Airport 80 (Estimated) Trained Spotter
Colfax 80 (Estimated) Public
Ankeny Airport 78 AWOS
2 ENE Saylorville 77 (Estimated) Personal Weather Station
Hubbard 77 CWOP
Des Moines Int'l Airport 75 ASOS
2 SW Conrad 75 (Estimated) Trained Spotter
Leighton 75 Personal Weather Station
5 WSW Cumming 75 (Estimated) Trained Spotter
3 WSW Glidden 74 AWOS
Knoxville Airport 71 AWOS


Wind damaged grain bin in Tama County. Courtesy of Kip Ladage

Corn damaged near Adel. Courtesy of Lisa Schmitz

Video from Huxley, Iowa. Courtesy Jeff Wood


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