This picture highlights some of the more common features of tornadic supercell thunderstorms. The first thing you might notice if you see a structure similiar to this in the field is the speed of the cloud motions. On the right hand bottom side of the picture is the inflow cloud/tail cloud. This is where warm rush air is being pulled rapidly into the main updraft of the storm. Once this inflow/tail cloud reaches the edge of the main updraft it rapidly begins it ascent. Meanwhile, at the back edge of the storm cooler drier air descends in the form of a rear flank downdraft. Just as the warm moist inflow/tail cloud is wrapped into the updraft, so to does the rear flank downdraft. You can see the rear flank downdraft as the narrow clearing that extends from the left of the main updraft nearly into the center of the updraft. Where the rear flank downdraft extends into the updraft is where a tornado would be possible to form.