A vigorous line of storms was moving into the NW corner of the ARX CWA prior to 23z.  The All Sky LAP CAPE showed decreasing values (~1100 J/kg) heading into this region.  In contrast, the NUCAPS forecast (un-interpolated image shown) depicted values of ~3000-4000 J/kg.  Based on the initial behavior of the storms, the higher instability values in the NUCAPS appear to have better verification.