This study examines the effect of daytime land-atmosphere interactions on warm-season nocturnal convection in the Southern Great Plains (SGP). The focus of this study is a Mesoscale Convective System (MCS) that occurred in the evening and overnight hours on 19-20 June 2007, during the Cloud and Land Surface Interaction Campaign (CLASIC). High-resolution numerical simulations of the 24-hour period containing the event were conducted using a coupled land-cloud allowing model, and sensitivity studies were conducted to elucidate the effect of the land surface on the pre-storm environment. June 2007 was one of the wettest months in Oklahoma history, and the simulated event occurred during a one-week period of rainfall, with the exception of one dry day, June 18. This hiatus in rainfall allowed for an enhancement of the signatures of soil and land-use heterogeneities in the study area. On the morning of June 19, simulations show that the differential sensible heating leads to the formation of convective rolls that gradually propagate through the domain. Additionally, the simulated dynamic and thermodynamic profiles at this time are conducive to the formation of gravity waves at the interface of the atmospheric boundary layer and the free atmosphere. During the day, non-precipitating convection forms in regions where boundary layer eddies and gravity waves are in-phase, but no precipitation occurs despite ample instability. At night, a MCS, which originated north of the study domain, propagates across the area. This study explores how the local evolution of the thermodynamic structure of the atmosphere, including dry entrainment from above, can impact propagating convection and enhance it at preferential locations.