We could see a weakening MCS move over us tonight and that will play a huge roll in Sunday's action.
Tomorrow's outlook is what I am more concerned about. The SPC meteorologists are forecasting that we could see one or even two MCS's move over this region during the day and evening on Sunday.
The leftover MCS that looks to hit late Saturday night into Sunday will play a key part in how unstable we are and what our atmosphere will be like for severe weather. If the MCS misses us altogether tonight, which is highly unlikely,...then our atmosphere will be untampered with and we will have very unstable conditions to deal with on Sunday. If the MCS does hit, like expected, then it will take some time for our atmosphere to recharge itself and that could cut down on the popcorn severe type storms, but the SPC is thinking our atmosphere will destabilize enough to allow severe weather so that is why all of Middle TN/SCK is in the slight category.