On the evening of June 20, 2021, an intense tornado affected the Chicago suburbs of Naperville, Woodridge, Darien, Burr Ridge, and Willow Springs in DuPage and Cook Counties in Illinois.

[2] On June 20, 2021, the Storm Prediction Center had outlined an Enhanced (3/5) risk for severe weather over extreme eastern Iowa, northern Illinois and Indiana, southern Michigan, and extreme northwest Ohio for the potential of severe weather, focused on damaging straight-line winds, with the potential for isolated large hail and non-significant tornadoes.

Two rounds of severe weather were forecasted, with one being an afternoon mesoscale convective vortex system that had moved through Missouri, central Illinois, and northern Indiana.

Later on in the evening, when the cloud cover decreased, daytime heating resumed, which, along with a strong lower-level jet, rapidly destabilized the atmosphere.

[1] At 11:06 p.m., the tornado crossed the West Branch DuPage River, and at around 11:09 p.m., intensified to EF2 strength as it approached Princeton Circle in Naperville.

[8] Two minutes later, at 11:17 p.m., a correlation coefficient scan from the KLOT weather radar site at Lewis University Airport indicated debris lofted up to 20,000 ft (3.8 mi; 6.1 km) into the air.

[8] Less than 10 minutes after the tornado lifted, WBBM-TV, Chicago's CBS affiliate, released a news story which described "extensive" damage in Woodridge and Naperville.

[12] On June 22, Alicia Tate-Nadeau, director of the Illinois Emergency Management Agency, toured storm damage in Naperville and Woodridge with DuPage county officials.

[13] On June 27, Brian McDaniel of the Illinois River Valley Red Cross met with county officials and opened the Multi-Agency Resource Center, where over 1,000 volunteers assisted to provide aid to those affected by the tornado.