A common storm splitting situation is simulated wherein the left-moving storm evolves into a multicellular cluster and the right-moving storm becomes a supercell. The left-mover is the focus of this study, as it is more sensitive than the right-mover to both midlevel dryness and aerosol perturbations. The results demonstrate that, while midlevel dryness has a larger impact on the multicellular precipitation than do aerosols, the precipitation may either increase or decrease with increased aerosol loading, depending on the height of the dry layer. This is found to result from changes in both the cloud and rain microphysical properties, which impacts the latent cooling rates and cold pool strength. Enhanced aerosol concentrations result in (1) more numerous, smaller cloud droplets that evaporate more efficiently; and (2) fewer, larger raindrops that evaporate less efficiently. Such microphysical changes have competing effects on the latent cooling rates, and the net effect is found to depend on the altitude of the dry layer. The resultant feedbacks to the strength of the downdrafts, cold pool, associated cold pool dynamical forcing, and subsequent secondary convection, are quantified and will be presented.