Models are still struggling with how to handle the overall pattern beyond Sunday, it seems in part because of the MJO.
If the MJO remains in the COD (possible), it may supersede effects from the developing +PNA / -NAO / -AO which should allow for the hot & dry pattern to continue uninterrupted across much of the Southern Plains. But if the MJO sneaks into Phase 8 / Phase 1, that may translate to deeper and longer duration troughing, at least for the early part of next week.
And of course regardless of the outcome with the upper level pattern, for North Texas there's still some question on a mesoscale level about the influence any outflow boundaries from nearby thunderstorms complexes in OK / AR will have.