The NAST-I and SHIS ultra spectral interferometer sounders flew on the NASA ER-2 aircraft during the May 2013 S-NPP Calibration/Validation Campaign. The ER-2 under flew the Metop-A and –B, Aqua, and SNPP satellites, which carry the IASI, AIRS, and CrIS ultra spectral sounding instruments, respectively. Special ground truth radiosonde and surface based upward viewing ultraspectral radiance Planetary boundary Layer (PBL) sounding observations (i.e., from the AERI and the ASSIST interferometer spectrometers) were obtained at the DOE Southern Great Plains (SGP) ARM CART-site and from a mobile ground site located in Yuma, Arizona. A common physical/statistical sounding retrieval algorithm and statistical database have been applied to the aircraft, ground-based interferometer, and satellite ultra spectral radiance data in order to use the higher spatial resolution aircraft data and higher vertical resolution surface-based interferometer PBL soundings, and radiosonde profiles, to validate the satellite sounding products. Differences between the satellite and the surface/airborne ground “truth” measurements are discussed. In particular, the comparisons between the satellite retrieved profiles and the ground truth observations revealed that improvements in the specification of surface emissivity spectra were needed in order to retrieve accurate atmospheric structure in the Planetary Boundary Layer (PBL). As a result a physical simultaneous surface skin/surface emissivity determination algorithm was implemented which improved the accuracy of atmospheric profiles retrieved throughput the lower trophosphere. Here, special emphasis is given to validating the satellite atmospheric stability and time tendency observations made prior to the development of the devastating Moore, OK tornado on May 20, 2013.