Great foto ! Whymper in its Memory talked about such type of cloud. First time I've seen it on Cervino. How was the weather before ? When I've seen it on Mont Blanc or some minor summit in Abruzzo the weather, after a couple of hours, became really bad.
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe