MIDWEST — More severe weather is possible across the Midwest on Tuesday, May 12, 2026, with large hail being the primary concern and damaging winds and a brief tornado also unable to be ruled out. The categorical outlook updated at 3:22 AM ET places a Marginal Risk zone across a broad corridor covering Chicago, Milwaukee, Springfield Illinois, St. Louis, Indianapolis, Kansas City, and Louisville. The severe threat area then shifts east toward the Ohio Valley and Northeast on Wednesday with more localized severe weather possible across that region.
Large Hail Primary Concern Across Marginal Risk Zone Covering Chicago Through St. Louis
The Marginal Risk inner core covers a broad north-south corridor from Milwaukee and Chicago southward through Springfield Illinois, St. Louis, and into Springfield Missouri and the surrounding region. Large hail represents the highest confidence hazard across this zone through Tuesday’s active weather window…