From The Weather Channel:

Tornado outbreak likely today: We'll produce the forecast reasoning soon with graphics but here's what you need to know:

Where: The Lower Mississippi Valley leading into the Gulf States (basically Dixie Alley).

Large cities inside threat zone: Memphis, Jackson, Birmingham, Montgomery, and Mobile.

Timing: May begin as early as lunchtime tomorrow and continue well into evening.

From Jackson, Mississippi National Weather Service forecast discussion:

"Many elements are coming together for a significant severe weather Thursday.
Long track supercell thunderstorms seem likely.
These storms will all have the potential to produce very large hail (golf to baseball), destructive winds of 75 mph or greater and tornadoes.
Some of these tornadoes could be of the long track variety and strong to violent.
That is a strong statement and rarely ever used."