Odd that something as potentially destructive as a volcano can be correctly described as "beautiful"... but I've seen many videos of tornadoes, and they have their own elemental beauty as well.

(R. and I, and A. and squeektoy42, went to Iceland on a mid-week special once. My particular reason for going was to see the aurora. It was overcast and drizzling the whole time we were there, and I never got a glimpse of the sky at all. And then we landed at JFK in a blizzard.)