The Wall Cloud Wall
A two-dimensional image doesn't begin to convey the intense, furious rotation that was going on in this wall cloud, hovering over Interstate 70 in eastern Colorado while spinning so fast that I thought it would produce a big tornado anytime. This was shot wide-angle; so we were rather close to the action. At least as fascinating as the rapid motions, I found that the menacing black base and spooky lighting added to the overall sensation of "impending doom" which didn't quite occur then, fortunately for the commuters on the roadways beneath. The storm later produced a very brief spin-up north of the road.
2 WSW Genoa CO (11 Jun 10), looking W