Dust storm preceding a rain storm rolling in off the water in Houston, TX. While not a terribly "artistic" photo, I though it had an urban expo sort of feel. Mind you this was taken in a working industrial area almost dead smack in the middle of the city. It was so much more surreal to see in person, watching the wall of dust roll up the street chased by incoming rain.
This is also the current background image to my blog.
Photo by me.