Midwest derecho of 2020

Midwest derecho of 2020 was an extreme convective windstorm that traversed the Great Plains, Midwestern United States, and parts of the Upper Midwest on August 10, 2020, producing catastrophic straight-line winds, tornadoes, and widespread destruction across urban and rural areas. The event intersected with major institutions and infrastructure in the region, prompting coordinated responses from federal agencies and state authorities while impacting agricultural production, electrical utilities, transportation networks, and cultural landmarks. Significant public discourse involved scientific organizations and political figures as recovery unfolded.

Background

A potent mesoscale convective system developed amid anomalous synoptic conditions interacting with the Rocky Mountains, the Mississippi River Valley, and a progressive shortwave trough identified by forecasters at the National Weather Service, the Storm Prediction Center, and the National Oceanic and Atmospheric Administration. Contributors included a moist boundary layer influenced by the Gulf of Mexico, a mid-level jet stream associated with the Jet Stream, and surface heating across states including Nebraska, Iowa, Illinois, and Wisconsin. Research institutions such as the University of Iowa, Iowa State University, University of Illinois Urbana–Champaign, Purdue University, University of Nebraska–Lincoln, and the Cooperative Institute for Meteorological Satellite Studies provided climatological context, while agencies including the Federal Emergency Management Agency, the National Aeronautics and Space Administration, and the United States Geological Survey monitored conditions. Political figures from the Office of the Governor of Iowa, the Office of the Governor of Illinois, and members of the United States Congress engaged with affected communities.

Meteorological history

During August 10, a bow echo and derecho consolidated across eastern Nebraska and western Iowa before accelerating eastward toward Chicago, Des Moines, Cedar Rapids, and Davenport. The phenomenon was tracked by Doppler radar operated by regional National Weather Service Chicago, National Weather Service Des Moines, and National Weather Service Quad Cities offices and analyzed by researchers at the University of Oklahoma, the National Severe Storms Laboratory, and the Cooperative Institute for Mesoscale Meteorological Studies. Embedded rear-inflow jets and downbursts produced observed gusts rivaling wind speeds measured at Hurricane Katrina-affected sites and gusts reported at O'Hare International Airport. The derecho generated serial and quasi-linear convective system features, producing derecho-class wind swaths and several tornadoes catalogued by the Storm Prediction Center and the National Weather Service Damage Assessment teams. Media organizations including the Associated Press, The New York Times, The Washington Post, Reuters, and regional outlets in Iowa City and Cedar Rapids documented the storm’s progression.

Impact and damages

The derecho caused widespread destruction to electrical grids operated by utilities such as MidAmerican Energy Company, Alliant Energy, Ameren Corporation, and municipal providers across Iowa and Illinois, leading to prolonged outages that affected hospitals including University of Iowa Hospitals and Clinics, nursing homes, and businesses including manufacturing plants tied to companies like John Deere and Pella Corporation. Agricultural impacts were severe for producers represented by the American Soybean Association and the Iowa Corn Growers Association, with research farms affiliated with Iowa State University Extension and Outreach and University of Nebraska–Lincoln Extension reporting extensive crop loss, especially to corn and soybean during critical reproductive stages. Damage assessments conducted by the Federal Emergency Management Agency and state emergency management agencies cited infrastructure damage to highways overseen by the Iowa Department of Transportation, to airports including Cedar Rapids Municipal Airport and Quad Cities International Airport, and to cultural institutions such as venues managed by the University of Iowa Stanley Museum of Art and local historic sites in Cedar Rapids. Insurance claims involved carriers regulated by state departments including the Iowa Insurance Division and the Illinois Department of Insurance while relief funding engaged the Small Business Administration and the United States Department of Agriculture’s Farm Service Agency.

Emergency response and recovery

Immediate response involved coordination among Federal Emergency Management Agency, the Department of Homeland Security, state emergency operations centers such as the Iowa Homeland Security and Emergency Management Division, county emergency management agencies, and volunteer organizations including the American Red Cross, Salvation Army, Iowa Volunteer Organizations Active in Disaster, and Team Rubicon. Search and rescue operations included municipal fire departments from Cedar Rapids Fire Department, Des Moines Fire Department, and suburban departments near Chicago Fire Department jurisdictions; medical surge planning engaged regional hospitals and the Iowa National Guard. Federal delegations including the White House and members of the United States Senate and United States House of Representatives conducted site visits to assess federal disaster declarations and funding. Recovery programs featured coordination with the Federal Emergency Management Agency Public Assistance Program, the United States Department of Agriculture Emergency Conservation Program, and grant processes overseen by state governors’ offices and legislative delegations.

Aftermath and long-term effects

Long-term impacts included restructuring of utility hardening plans by companies such as MidAmerican Energy Company and Alliant Energy and policy discussions within state capitols including Des Moines City Hall, Iowa State Capitol, and Springfield (Illinois) regarding grid resilience and vegetation management. Academic studies published by teams at Iowa State University, University of Iowa, University of Illinois Urbana–Champaign, National Severe Storms Laboratory, and NOAA informed improvements in severe-weather forecasting and emergency alerting systems used by the National Weather Service and local emergency managers. Agricultural research collaborations involving the United States Department of Agriculture, Iowa State University, Purdue University, and commodity groups like the American Farm Bureau Federation addressed crop insurance, disaster assistance, and resilience for producers. Cultural recovery involved restoration projects for institutions including the University of Iowa Stanley Museum of Art, local historical societies, and community organizations in Cedar Rapids and Iowa City. Legal and legislative responses engaged bodies such as state legislatures for Iowa and Illinois and oversight hearings in the United States Congress to evaluate federal response and infrastructure investment.

Category:Severe weather events in the United States