Couple of keys to the setup. First, the morning convection cluster limited the warm fronts progression north. Second it left a broad area of subsidence as highlighted by the red X. Also, due to this subsidence there was no development of shallow cumulus, which lead to afternoon highs in the region from the upper 80s to low 90s. This left dew point depressions of in excess of 30F where the yellow X is located. Why was it so favorable south? No subsidence, shallow cu field limiting day time heating (circled in yellow) and the further south than expected warm front/triple point which increased helicity in central Ok. The top image shows initiation, which, with a bulging dryline seems to change the low level shear, ie surface winds to have more of an easterly component, which only increases the lowest few km directional shear.
Really think this is the reason why central Ok was hit hard and north along the KS/OK border was spared for the most part.
Convergence
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