The Pacific is too active and not enough ridging out west. This allows the SE ridge to flex. We have cold air spilling into the southern plains instead.
It has been the problem all winter. We have had the best Atlantic setup in a decade but it has basically been canceled out due to the Pacific. I think having the -NAO it has allowed us a little snow this winter. If we didn't have the -NAO/AO, we would have most likely torched