Supercells Ignite Along NE-IA-MO Cold Front with Tennis Ball Hail, 80 MPH Gusts — SevereWX

SPC Mesoscale Discussion 1125 highlights a ramping severe threat along a southward-moving cold front this afternoon and evening.

Storms are expected to explode near the intersection of the front and a remnant outflow boundary, fueled by northward-spreading high instability (MLCAPE per recent soundings). With deep-layer shear of 40-50 knots, initial development favors supercells packing large hail (1.50-2.50 inches), damaging winds (65-80 mph), and potential for gusts up to tornado intensity (90 mph).

Areas at risk include southeastern Nebraska, southwestern Iowa, and northern Missouri—near Omaha, Des Moines, and St. Joseph. As storms spread east and upscale, the focus shifts to widespread wind damage.

Severe thunderstorm watch issuance is 80% likely within the next few hours (valid through 2215Z). Peak threats: tennis ball hail, 80 mph gusts.

Stay tuned to local NWS offices (OAX, DMX, EAX, TOP) and radar. Prepare now: Secure outdoor items, seek shelter in interior rooms if storms approach, and have multiple alert sources ready.