Srong return flow from the Gulf of Mexico has brought cool and moist mT air north across the southern Plains during the past 24 to 36 hours. Weaker flow aloft has advected a cT, elevated mixed layer eastward over the mT air mass. Thus, the soundings above (DRT to FWD to TOP bottom to top) all illustrate classic capping inversions (or Lid structures), with an mT boundary layer topped with a deep, high-lapse rate, old boundary layer. All these soundings are fairly stable this morning and the mT air will need some serious heating before there's much CAPE available.
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