This was photographed with a Canon 7 D using a Canon 24-105 mm. lens.
This was photographed near Weyauwega, Wisconsin.
This was a unique cloud formation as rolling. I have witnessed this less than 5 times in my adult life and every time it looks so amazing and scary at the same time. I was on the highway when i spotted this and turned off to hopefully catch this at Lake Weyauwega. Got most of it.
This is a 3 exposure high dynamic range image processed in Photomatix Pro and Topaz labs.