The past several years have featured some anomalously early season riding and subsequently anomalously strong upper troughs within the CONUS and certainly with that you would expect a stronger jet stream. The prospects of CC would certainly be a player in this.
Once we're able to break that pesky vortex the flood gates should open to get higher heat/humidity in here. This doesn't mean it will be prolonged, especially if the jet stream continues to be loaded with perturbations, but we'll get these bursts of heat/humidity in here. Once these heat ridges become established across the southern states they are very hard to break down. This circles back to the CC idea, but it seems the past several years these big heat ridges have become established earlier than usual across the southern states (whether this be the West, Southwest, or southern Plains) and with that we've seen much earlier periods of higher heat/humidity too.
Even if we don't get the full flexing of the ridging here...that doesn't mean we won't see big heat/humidity. If anything, hopefully being on the crest of any ridging would yield some convectively active periods.