Genesis of a Tempest
Here's the cell that later on fired up and allowed me one of my best lightning photography sessions I've yet had. I love how you can almost just taste the fantastic amounts of energy pulsing through this system.
Image Notes: 5 frame HDR constructed via Image Fusion in Photomatix. Even the highlights recovery of LR4 made HDR a necessity if I wanted to pull all the highlights detail out of the lit part of the cloud (it took -3 EV to protect highlights adequately in the high dynamic range scene).