Illinois Cold Front Ignites Supercells Threatening Hail, Tornadoes into Indiana, Michigan — SevereWX

Thunderstorms are ramping up across eastern Illinois, northern Indiana, and lower Michigan as a cold front surges southeastward, sparking a serious severe weather setup this afternoon.

The Storm Prediction Center's Mesoscale Discussion 1154 highlights increasing storm activity ahead of a surface low over Wisconsin. Early storms in lower Michigan already carry marginal severe hail risks, but the main show develops back west near the front in Illinois by early afternoon.

Key Threats:

• Large Hail: Up to 1.75 inches (golf ball size) from initial supercell modes.
• Damaging Winds: Gusts to 70 mph as storms grow upscale.
• Tornadoes: A couple possible, with peak intensities of 85-110 mph, thanks to curved low-level hodographs boosting storm rotation in northern Indiana and southern Michigan.

Strong deep-layer shear and steepening lapse rates from an approaching upper low will fuel supercells initially, transitioning to bowing clusters with wind as the primary hazard later. SPC pegs watch issuance odds at 80% within the next couple of hours for parts of the region.

This ties into broader frontal activity but stands out for its tornado and hail upside in populated Midwest areas. Track updates via local NWS offices (LOT, IND, IWX, GRR, APX, DTX).

Stay prepared: Have a severe weather plan, monitor radar, and seek shelter if warnings hit. Power outages and travel disruptions possible—charge devices now.