This fearsome looking wall cloud to our northwest did occur with a severe thunderstorm which produced golf ball size hail and strong winds. However, within 10 minutes the wall cloud began to break up as cold outflow undercut it.
Photograph by: Moller
Note the tendency for the same wall cloud to look more disorganized as it "gusted out," or was undercut by outflow.
Photograph by: Doswell
In addition to the lack of persistence, the wall cloud exhibited little if any rotation. It completely disappeared within another 5 minutes.