This evening I was patrolling one of our parks (in the absolute middle of nowhere). I got out of the truck for a smoke and looked up. I noticed this weird cloud formation. It looked as if the clouds parted in a straight line - and the part went from where you see below, over my head, and out of sight behind me. I was wondering if anyone knows how this happens...as I know very little about this kind of stuff. It reminded me of a reverse rainbow.