This article makes an important contribution to our understanding of circulations at convective cloud edges, at the interface between cloudy and clear skies where there is turbulent mixing. Prior studies have emphasized "subsiding shells" where there is a descending branch of a cloud edge toroid, and suggested that these are driven by the negative buoyancy created by evaporative cooling of cloud droplets in clear air. This article uses numerical modeling and observations to point to the importance of a second mechanism, that subsidence is due to a pressure perturbation created by the rising branch. Considering convective clouds over the Amazon, this second mechanism is proposed to be most important during the dry season when convective updrafts are generally strongest.