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2012 Henryville tornado

2012 tornado in Indiana and Kentucky, US

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Meteorological synopsis

On March 1, 2012, a moderate risk of severe weather was issued by the Storm Prediction Center for March 2 a day in advance for a large area from near Tuscaloosa, Alabama to Dayton, Ohio as an intense low-pressure area tracked across the region in a very high shear and convective instability environment. The severe weather agency noted that the environment, consisting of high convective available potential energy (CAPE), favorable thermodynamics, and a warm front that was expected to destabilize the atmosphere across portions of Mississippi, Tennessee, and Ohio Valleys, would support an environment for intense tornadoes across the moderate risk area. Parts of the risk area were upgraded to a high risk of severe weather, primarily for Middle Tennessee and central Kentucky, which was later extended into central and southern Indiana, as well as southern Ohio. The Storm Prediction Center noted the combination of a destabilizing warm sector, favorable dewpoints, a forcing mechanism, and strong lower-level shear; this would lead to the potential for significant, long-tracked tornadoes.

An evolving line of semi-discrete tornadic supercells across eastern Illinois and western Indiana following the northward lifting of the warm front and a rapidly-strengthening low-pressure area over the central Great Lakes prompted a PDS tornado watch for eastern Illinois and western Indiana, along with southeastern Missouri and western Kentucky; a second PDS tornado watch was issued for eastern Indiana, western Ohio, and central Kentucky as the line moved east.

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