Chicago Tornado Warning: Live Radar, Path Forecast & Urgent Safety Tips

Update: Tornado Warning Issued for Chicago as Dangerous Storm System Approaches Chicago residents are once again under a tornado warning this Thursday, June 18 2026, as a potent line of super-cell thunderstorms races across northern Illinois. The National Weather Service (NWS) placed Cook, DuPage, Will and surrounding counties under a Tornado Watch early this afternoon, upgrading portions of the metro to a Tornado Warning shortly before 4 p.m. CDT when radar indicated rotation just west of O’Hare International Airport. Why Today’s Setup Is Dangerous • Extreme humidity and a warm front draped along I-80 are fueling CAPE values above 2,000 J/kg. • A 50-kt low-level jet is adding dangerous wind shear, increasing the chance for long-tracking tornadoes. • Storm-relative helicity numbers mirror last week’s outbreak that spawned at least 11 tornadoes across the Chicago forecast area, including three rated EF-3. Timing and Threats • First wave: 3 p.m.–6 p.m. — discrete super-cells capable of producing strong tornadoes, golf-ball-size hail and 70 mph gusts. • Second wave: 7 p.m.–11 p.m. — a bow-echo squall line with embedded tornado spin-ups and widespread wind damage, especially south of I-80. • Overnight: Flash-flood threat as storms “train” over the same neighborhoods, dropping 2–4″ of rain. Preparedness Checklist for Chicagoans 1. Have multiple ways to receive tornado warnings: NOAA Weather Radio, Wireless Emergency Alerts, local TV and trusted weather apps. 2. Identify your safe place now — a basement or small interior room on the lowest floor, away from windows. 3. Charge phones and keep extra batteries for flashlights; expect scattered power outages as winds top 70 mph. 4. Secure lawn furniture and loose objects; debris becomes dangerous in severe winds. 5. If commuting, monitor real-time road closures and be ready to shelter in sturdy buildings; avoid overpasses. Travel & Event Impacts O’Hare and Midway airports are already reporting ground stops, and Metra is warning of possible evening rush-hour delays. Outdoor concerts in Grant Park and suburban farmers’ markets have been canceled or postponed. ComEd crews have been pre-staged across the metro to respond to downed lines and restore service quickly. Looking Ahead Forecasters caution that Illinois remains in an unusually active severe-weather pattern through the weekend. Another strong cold front could regenerate severe storms late Friday, so keep weather alerts enabled even after tonight’s storms clear. Bottom Line If you are inside the current Tornado Warning polygon, seek shelter immediately. With atmospheric ingredients in place for violent, fast-moving twisters, seconds matter. Stay tuned to local meteorologists and official NWS statements for the latest tornado warning updates and track information.