3D View of Supercell
Fig
(B)  Full formation of both forward and rear downdrafts.
(C)  The mature super with a strong rotating updraft and tornado (red) located at the coupling of the updraft and rear flank downdraft.
(D) The decaying supercell storm – the rear flank downdraft wrapping around the updraft and cutting off the supply of warm, moist air. A new updraft is forming to the southwest of the previous updraft.