I was out late in the evening, and this storm was dying, so there was an outflow band kicking up dust.  The storm was impressive as it moved it, but it was quickly dying.  I happened to get one of the last shots of lightning streaking overhead before it was gone.  After going back to this photo I realized that the color of the lightning in the clouds, with the color of the dust blowing in from the east made for a really neat looking sky.

This wasn’t originally one of my favorite photos I’ve ever taken, but it has become one of my favorites.