Will this be the first new cloud type to recognised for 60 years? The Cloud Appreciation Society is lobbying for the undulatus asperatus or agitated wave, seen just above the horizon in this picture, to be added to the International Cloud Atlas
IT'S A SONIC RAIN BOOM! Circumhorizon Arc (aka Fire Rainbow) - an ice halo formed by ice crystals located in cirrus clouds. Light passes through the hexagonal crystals and if seen at the right angle forms a rainbow cloud.