The last image was taken minutes later looking south at the southern most point of the t-storm complex. In a pretty good position here(not the safest though). What I call a nob cloud was is the location where you might expect a wall cloud. I call it a nob cloud because they occur all the time and not worthy of wall cloud status. Perhaps my assessment at the time was wrong and it was a wall cloud? Either way I was drawn in by a nice looking base above and east of it. What I noticed while processing the image was the smooth horizontal feature almost in the center of the picture. I interpreted this as the shelf cloud in the moment and it will remain as such, but kinda looks like a downburst? Anyway after this the storm engulfed me in series of technical and navigational failures. Really wish I had taken the time to get further south towards I-80 which was my go-no go line.  

Nob clouds: I always keep my eyes on them but will usually already be looking for something else to chase.