UNITED STATES — A powerful cold front is set to trigger a dramatic weather whiplash across Illinois, Indiana, Michigan and Wisconsin late Sunday into Monday, bringing severe thunderstorms followed by a rapid transition to accumulating snow — all within roughly 15 hours.
Forecast model simulations show a deepening low pressure system tracking north through the Midwest Sunday night, with a tightly organized line of intense thunderstorms racing north from Tennessee through Indiana and into Michigan.
Sunday 11 PM: Severe Line Intensifies
By late Sunday evening, around 11 p.m., a solid line of heavy thunderstorms is projected from:
- Memphis, Tennessee
- Nashville, Tennessee
- Evansville, Indiana
- Indianapolis, Indiana
- Stretching north toward Milwaukee, Wisconsin
This line could produce widespread severe weather reports, including damaging winds and embedded tornado potential, as temperatures surge into the 70s ahead of the front.
The simulated radar shows a classic high-impact squall line aligned south-to-north, feeding into a strengthening surface low near the western Great Lakes.
Monday 2 AM: Storms Push East, Cold Air Crashes In
By 2 a.m. Monday, the low intensifies further as it tracks into Michigan. The severe line shifts east toward:
- Cincinnati, Ohio
- Louisville, Kentucky
- Detroit, Michigan
Behind the front, colder air begins rushing in rapidly across Illinois and Missouri. Rain transitions to a wintry mix and then snow from:
- St. Louis, Missouri
- Springfield, Illinois
- Peoria, Illinois
- Western Indiana
Temperatures begin a steep drop as the Arctic air surges southeast.
Monday 8 AM: Snow and Temperatures in the Teens
By Monday morning, much of Illinois, Indiana and parts of Michigan are projected to be fully on the cold side of the system…