It is already known that deep bore-like modes generated by pre-existing (long-lived) convection can induce vertical displacements that destabilize the surrounding atmosphere, making it prone to further convective development and clustering. Yet, such modes do not explain the regular spacing of the cloud field. In this presentation a combination of cloud-resolving and idealized model simulations, and theory will be used to show that the emergence of these scales is a result of a coupling between the deep convective clouds and the mesoscale gravity waves that they generate. An important component of the coupling is the transience of the wave source that allows a set of gravity waves with discrete horizontal wavelengths to emerge. The horizontal wavelength of these waves exceeds the size of individual cloud elements and matches the cloud spacing identified from cloud model simulations. The physical characteristics of the convection that control this selected scale will be discussed.