MCS cases are days with supercells that made the overnight transition to an MCS based on radar reflectivity imagery, whereas null cases had supercells, but the absence of a defined MCS. For 21 MCS cases and 17 null cases, hourly rapid refresh (RAP) model data was averaged out over subjective coordinates centered at the transition, with a grid created for each, and averaged over all x and y. Composites of atmospheric fields from 18Z to 9Z were constructed separately for MCS and null cases. Comparing the two, it is evident that the low level jet is stronger in MCS cases, as indicated by the stronger change in meridional wind component. Furthermore, the divergence and potential temperature advection changes indicate greater ascent in the low levels of the nocturnal environments of MCS cases. Although CAPE is similar between MCS and null cases, null cases exhibited higher Delta Z LFC heights, whereas MCS cases had slightly greater wind shear, particularly in the low levels.