Supercell Thunderstorms Threaten Tornadoes Across Southern Indiana, Ohio — SevereWX

Storms are firing up along a frontal zone draped across the lower Ohio Valley into central Kentucky and middle Tennessee. As a cold front and surface cyclone nudge southeast, diffuse heating is pushing surface temps into the upper 70s to low 80s amid a steamy air mass.

Storm Prediction Center's Mesoscale Discussion 1816 highlights increasing thunderstorm coverage from southern Indiana southward. Modest lapse rates are giving way to MLCAPE of 1000-2000 J/kg, fueled by weak upper-level ascent. Effective shear around 30-35 knots and low-level SRH of 75-150 m²/s² set the stage for organized multicells and transient supercells.

The main hazards: water-loaded downdrafts capable of 55-70 mph gusts, especially in clustering storms. Low-level vorticity along the Ohio River could spin up a couple tornadoes rated 85-110 mph—low-end but potent in populated spots.

A watch issuance is 40% likely within the next few hours (through 4 PM CDT), though lingering clouds and fuzzy forcing add uncertainty on peak threats.

This setup differs from recent Missouri supercell outbreaks, with more clustered evolution here amid high PWATs.

Stay prepared: Monitor radar closely, secure outdoor items, and have a severe weather plan ready. Know your safe spot indoors. Check local NWS updates for the latest.