Supercells Revving Up Northern Iowa to Southwest Wisconsin with Large Hail, Tornado Threat — SevereWX

Storms are picking up steam along a stalled frontal boundary stretching across northern Iowa this late morning, fueled by an incoming mid-level shortwave trough from the northwest.

SPC's latest Mesoscale Discussion (1436) flags a growing severe risk as heating removes any lingering cap, unleashing 2000-2500 J/kg MLCAPE. Current elevated storms could root to the surface soon, pairing deep instability with 40-50 kt mid-level winds to spin up supercells through early afternoon.

Expect the worst in northern Iowa bleeding into far southwest Wisconsin:

• Hail: 1.50-2.50 inches
• Winds: 65-80 mph gusts
• Tornadoes: Up to 90 mph (low-end EF2)

Watch issuance odds sit at 40%, with the setup primed for discrete storms packing a punch before potential clustering later. This fits into today's broader Midwest severe pattern, but northern Iowa remains ground zero right now.

Stay prepared: Monitor radar closely, have a severe weather plan ready, and heed any watches or warnings from your local NWS office. Power outages, crop damage, and vehicle hail threats are real possibilities—secure outdoors and seek shelter if storms approach.