Ah yes I see what you mean. Yeah it's pretty amazing how mountains like that seem alive. The local Indians thought so. The mountain creates its own weather system. I remember when Mt. Saint Helen blew up it had thunder and lightening. Like you, I believe there is dome kind of power concentration going on there.
I just heard on the local tv station they had an article on those clouds and thought about this post, so I looked it up and here's the link to it. It has those pictures you had and some others. I like the 4th from last one. It shows an even wider view showing it goes even higher than those clouds. http://www.komonews.com/weather/blog/35631614.html?blog=y