Wednesday/Wednesday Night Severe:

Here is my discussion:
Severe weather is expected tomorrow along a cold front from the lower Great Lakes through the southern Planes/Lower Mississippi valley. A MCS (I think I found the right abbreviation) will likely be ongoing tomorrow morning in IA/northern Missouri. Damaging winds are possible along with flooding rains with this. Tomorrow morning this will continue to blast east and will likely weaken as it moves towards IL/IN/OH. However, some convection will likely start firing along the cold front late tomorrow afternoon from Michigan into IL, IN, western KY, Missouri. It appears debris clouds from the morning convection will litter the sky in these areas most of the day. This will keep temps, CAPEs, and LIs down. This will limit how severe and widespread the PM storms can get. I think north of southern Missouri that the PM showers/storms will be scattered and the severe threat will not be that great, so just a few reports of hail/high winds are expected from Michigan into northern/central Missouri, and a very outside chance of a couple tornado reports.
NOW THE IMPORTANT PART!
Over Arkansas/NE Texas, it appears that there will be at least some sun most of the day Wednesday. CAPEs will be in the 1000-2000 range with negative LIs, there will be a strong LLJ, and wind shear tomorrow afternoon/evening over these areas. It looks like tomorrow afternoon storms will start firing over NE Texas. Surface temps will be warm but a cool pool will be developing aloft. This could allow for very large hail and damaging downburst winds tomorrow afternoon/evening in the moderate risk area. The wind shear will also cause a tornado risk. These storms will push east in AR tomorrow evening with continued huge hail, damaging straight line wind, and tornado threats. Tomorrow night as the storms push farther east into Mississippi/TN it looks like they will weaken due to the loss of instability. This is the area to watch tomorrow. Farther north instability will just be too low.