This was probably my most memorable shooting "experience" to date. I was leading a workshop in the Palouse and ran into fellow Photocascadia member, Zack Schnepf (who was also leading a workshop) up at Steptoe Butte. We watched this fog slowly roll in and shot like mad for about 30 min. Shortly after this shot, all of the hills down below us were completely covered in fog. I have never seen anything like it before.
Many techniques used on this image are demonstrated in my recently released set of videos: Image Editing Volume 1