Central Iowa Storms Turn Surface-Based, Fueling Strong Tornadoes and Very Large Hail — SevereWX

Central Iowa storms are rapidly intensifying as they become surface-based this afternoon, per SPC Mesoscale Discussion #1675.

Visible satellite loops show convection in north-central Iowa deepening and rooting near the ground. South of these storms, extreme instability combines with stout wind shear, setting the stage for severe supercells. A nearby outflow boundary is sharpening low-level rotation, raising odds for tornadoes -- some potentially strong at 120-145 mph (low-end EF3).

Key threats include:

• Very large hail: 1.50-2.50 inches (golf ball to tennis ball size)
• Damaging winds: Up to 65-80 mph gusts
• Strong tornadoes: Enhanced by the modifying boundary

Storms may start supercellular with isolated severe risks, but clustering could ramp up wind threats later. SPC pegs tornado watch odds at 95% for portions of central Iowa, valid until around 4:45 PM CDT.

This setup echoes recent Midwest volatility, but the surface-based shift adds urgency. Check the SPC graphic for exact lat/lon blocks covering central counties.

Stay prepared: Review your severe weather plan, identify a safe room, and keep NOAA Weather Radio or apps handy. Heed any watches or warnings -- act early to stay safe.