CHICAGO, ILLINOIS — Concern is rapidly growing among forecasters for a dangerous QLCS event Thursday across the Chicago, Milwaukee, and Peoria corridor, with the SPC highlighting a zone where widespread 60 to 70 mph wind gusts and spin-up tornadoes are likely during the evening commute hours.
SPC Draws Purple Zone Over Chicago and Milwaukee for Thursday
The AguaceroWX graphic valid Thursday June 11 shows a purple-shaded QLCS zone centered directly over Chicago, Kenosha, Waukegan, Milwaukee, Janesville, Rockford, and extending northeast into the Saint Joseph and Kalamazoo corridor across Michigan. This is the zone where the SPC has identified the highest confidence for widespread damaging gusts and embedded spin-up tornadoes.
A squall line with embedded kinks of spin is the primary storm mode concern, meaning tornado potential comes from line-embedded rotation rather than discrete supercells. These QLCS tornadoes can be brief and difficult to warn for in advance.
Widespread 60 to 70 MPH Gusts the Primary Threat
The dominant hazard with Thursday’s QLCS is widespread wind gusts between 60 and 70 mph across the purple zone covering Chicago and Milwaukee. Numerous gusts in this range are expected across the broader red-shaded area covering Davenport, Cedar Rapids, Dubuque, Peoria, and the surrounding region as the squall line pushes through.
Power outages, downed trees, and structural damage are all likely outcomes across communities within the highest wind probability corridor during the evening hours.
Evening Commute Hours Add Significant Risk
Forecasters are specifically flagging the evening commute as the timing window for the worst of Thursday’s storm impacts across Chicago and Milwaukee. Residents and commuters in both metro areas should plan to be off the roads and in sturdy shelter before storms arrive Thursday evening.
Anyone in the purple and red-shaded zones should prepare for a rough evening with rapid warning response times essential given the QLCS storm mode.
Stay with GordonRamsayClub.com for the latest updates.
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