Could be Monday as well,where ever the boundary sets up.GFS has been showing this for several runs now,but Tuesday looks better as you mentioned
...Portions of the TN Valley...
Multiple rounds of thunderstorms are possible along a residual
baroclinic boundary across the TN Valley, both during the morning
hours, and later in the evening. While not quite as unstable as
points farther to the west, modest mid-level lapse rates amid
elongated hodographs should support multicells, supercells, and
short line segments. The stronger storms may be capable of isolated
instances of large hail, gusty winds, and perhaps a brief tornado.