The Wall Cloud Wall
Aberdeen Wall Cloud
This supercell moved directly over Aberdeen, a regional population node also containing a weather forecast office, before cruising eastward along US-12 and treating motorists to a frightening spectacle. Fortunately for residents along and near the highway, the supercell never spawned a tornado. At this stage, the storm had endured some cell mergers and still was laden with wrapping precipitation--but not enough to prevent the mildly rotating wall cloud from being visible. As quite often is true, the bottom of the cloud sloped downward toward the most dense part of the nearby main precipitation core, rain-aided higher humidity of inflow air contributing to a lowered cloud base.
1 SW James SD (17 Jun 12) Looking W