The GFS has been in pretty good agreement from run to run, with a deepening trough bringing in strong flow over the southern plains by mid-week. This trough will also help in significant moisture return, with a narrow moist axis containing >60 Td's across TX/OK/KS by Wednesday per the latest GFS. This deep gulf moisture, when combined with low 80's temperatures, should yield sufficiant instability. In addition, the strong speed/rotation through a rather deep-layer will support organized severe thunderstorms... And given the strength of this system at this time of year, it could spell out a classic "fall" event. It's WAY to early to tell yet, but I just that I'd open a thread for free discussion for this system...