Chicago, IL
Summary: The National Weather Service in Chicago issued a severe weather briefing for June 11, 2026, warning of a significant tornado outbreak, damaging winds, and hail across northern Illinois and northwest Indiana.
This NWS Chicago weather briefing, dated June 11, 2026, outlines a severe weather threat occurring in two waves. The first wave (11 AM – 3 PM) focuses on damaging winds and hail north of I-80. The second, more dangerous wave (4 PM – 11 PM) presents a threat for all hazards, including strong (EF-2+) tornadoes, particularly between 4 PM and 8 PM along and north of I-88. Residents are advised to have multiple ways to receive warnings and to review their severe weather safety plans.
Document outline
1. Key Messages and Timing of Severe Weather 2. Threat for Strong (EF-2+) Tornadoes (4 PM - 8 PM) 3. Individual Severe Hazards (4 PM - 11 PM) 4. Safety Recommendations and Preparedness 5. Additional Resources and Outlooks