The two vidcaps above are from storm #2 in King George county on June 4th. Note the feature to the left of the light pole; that is part of the wall cloud beginning to coalesce and provide evidence of rotation. The video clip is a portion of what I shot while watching the storm in which you can witness the growth of this feature. (My apologies for the unsteady image; my little hand-held disposable videocamera is rather shaky.)