Surface Cyclone Ignites Supercell Tornado Risk Across IN, OH, KY, TN — SevereWX

Scattered thunderstorms are firing up this afternoon ahead of a cold front and occluded surface cyclone over the Ohio and Tennessee Valleys. Portions of southern Indiana, Ohio, central Kentucky, and middle Tennessee face risks from damaging wind gusts up to 70 mph and a couple of tornadoes rated 85-110 mph.

SPC Mesoscale Discussion 1816 notes showers and storms intensifying along the frontal zone, with surface temps climbing into the upper 70s to low 80s despite clouds. Moist air is boosting MLCAPE to 1000-2000 J/kg, while 30-35 kt effective shear and low-level SRH of 75-150 m²/s² support clusters, multicells, and transient supercells. High PWATs could load downdrafts for gusty winds, and backed low-level flow near the Ohio River in southern IN, northern KY, and southwest OH heightens tornado odds.

Storm coverage should ramp up from Indiana southward through KY, OH, and middle TN between 1 PM and 5 PM EDT. Confidence is low due to clouds and vague forcing, but SPC eyes a 40% chance of issuing a tornado watch.

Key Threats:

Stay radar-ready in the risk area—monitor updates from local NWS offices like IND, ILN, LMK, JKL, OHX, MRX, HUN, and PAH. Have a severe weather plan: identify shelter, charge devices, and heed warnings.