Figured I would start a thread for this event tomorrow over the Ohio Valley and to some extend the Midwest region. There are (2) TWO potential target areas to look at.... 1) The 12z 3km NAM shows a ~90kt H5 jet pushing into Southern Indiana/Southeast Illinois by 21z tomorrow. Storms should fire ahead of a 988mb surface low that will be positioned over SE Illinois and move northeast into Indiana. Most guidance is showing at least upper 50s to perhaps lower 60s dew points in this region, along with somewhat decent lapse rates, giving CAPE values of 1500-2000 J/KG on the triple point tomorrow. SRH should also be quite abundant as well with values exceeding 300 m2/s2 when storms approach the warm frontal boundary. Supercells would be the initial preferred storm mode given such such shear and curved hodographs. However storms should go upscale as they push east across the Ohio Valley with a higher threat of damaging winds. In my eyes right now, the highest threat of tornadoes in the best terrain appears to be early on from 18z thru 22z across SE IL into SW IN perhaps near the I-70 corridor. CAMS have been showing some decent UH tracks along that region as well. 2) The second target, and perhaps main target, for tomorrow will be further south across AL/GA/TN. There are concerns over morning convection and the extent to which the warm sector gets modified, however looking at morning data, a fairly impressive combination of CAPE/shear does exist over a large area of real estate in the south tomorrow ahead of a dry punch associated with this strong surface cyclone over IL/IN. The best threat in this region for tornadoes, some perhaps strong and long tracked appears to be in the 21z to past 00z time-frame....and the best threat being from Birmingham, AL northeastward where CAMs show several impressive UH tracks during this time frame, through a volatile environment. Surface winds along the actual front itself won't be as backed as up north, so it will be reliant somewhat on getting convection to develop a few counties east of that frontal position where winds are more significantly backed and SRH much higher. As for chasing tomorrow, I plan to stick to the more "obvious" target in my eyes considering where I live, SE IL/IN. I think as long as storms don't interfere with each other too fast, it could be a somewhat decent day up here. A very impressive system for any-time of the year.