The first time I saw one of these, was in the middle of the night, in the middle of W601. W601 is a naval training area off the coast of Washington. Being a weatherman, you’d think I’d see them all the time. But they don’t occur too often. I had thick fog up here the other morning, and with the sun shining brightly, a fogbow appeared. They appear colourless as they are made up of tiny water droplets. Check out Wikipedia for more info.