3 Injured in Woodridge in Tornado Path Following Naperville Tornado Strike

Tornado damage at apartment complex The Estates of Thornberry Woods on Gladstone Drive near the border of Naperville and Woodridge YouTube Tips ⓘ

The Lisle-Woodridge Fire District was notified at approximately 11:15 p.m. on Sunday, June 20, 2021 of a possible tornado touchdown in Woodridge, Illinois within DuPage County. Fire and Police personnel were dispatched to the area of Woodridge Drive and Jonquil Lane in Woodridge — just over two miles east of the location where six people were injured in Naperville near Ranchview Drive and Princeton Circle. The tornado also caused severe damage at The Estates of Thornberry Woods luxury apartments on Gladstone Drive, about 0.6 mile east of Ranchview Drive and Princeton Circle where peak winds of 143 MPH may have occurred. From the luxury apartments on Gladstone Drive the tornado passed through about one mile of woods and the East Branch DuPage River before striking the area of Jonquil Lane and Woodridge Drive.

A General Alarm assignment was immediately dispatched by DU-COMM. Lisle-Woodridge Fire District along with firefighters and paramedics from Darien-Woodridge, Downers Grove, Tri- State, Hinsdale, Westchester, West Chicago, Wheaton, Glen Ellyn, Warrenville and Westmont Fire Departments/Districts were dispatched to this area.

Upon arrival of initial companies, significant damage was noted in the area including large trees in the parkways and on houses, power lines down throughout the neighborhood and several gas leaks. According to the Lisle-Woodridge Fire District, three patients were transported to local hospitals. Initially no information regarding the extent of injuries was released.

Squall Line and QLCS

A “squall line” refers to a linearly-oriented zone of convection (i.e., thunderstorms). Squall lines are common across the United States east of the Rockies, especially during the spring when the atmosphere is most “dynamic.” A “bow echo” or “bowing line segment” is an arched/bowed out line of thunderstorms, sometimes embedded within a squall line. All these terms fall under the more generic term Quasi-Linear Convective System (QLCS). Bow echoes, most common in the spring and summer, usually are associated with an axis of enhanced winds that create straight-line wind damage at the surface. In fact, bow echo-induced winds/downbursts account for a large majority of the structural damage resulting from convective non-tornadic winds. Transient tornadoes also can occur in squall lines, especially in association with bow echoes. These tornadoes, however, tend to be weaker and shorter-lived on average than those associated with supercell thunderstorms.

— NWS Louisville, Kentucky

It’s never good to have to do these analyses this late at night, but the tornado that hit Woodridge, IL and nearby suburbs of Chicago was likely a strong EF3 based on an impressive 18,000+ ft TDS (Tornado Debris Signature) and a 66 kt Vrot (66 knot Rotational Velocity), both remarkable for a QLCS tornado (Quasi-Linear Convective System tornado)

— Graduate Research Assistant at ARRC – Advanced Radar Research Center, University of Oklahoma and Student Intern at the National Weather Service Radar Operations Center

Damage assessment continued Monday and following. No firefighter injuries were reported.

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