Went out on my balcony to have a smoke and the clouds were amazing. So, before I hit the sack for the night, I had to go up on the roof and get a shot. I was right up on the very top of the roof to get this, which scares the shit out of me in the daytime but when you can't really see exactly where you are walking... it's scary. But, worth it... eh?
Tokina 11-16mm f/2.8 @ f/5.6
7-frame bracketed burst merged to HDR in Photomatix
Exposures: 1.3, 2.5, 5, 10, 20, 40 secs.