Our friends at the World Meteorological Organisation have asked for help from our members. They’re working on a new edition of the official reference book on the classification of clouds, the International Cloud Atlas, and they are currently gathering photographs to include. We’ve helped out with our competition to find a photograph of the new ‘asperitas’ cloud but the WMO are also looking for good examples of a range of different cloud types. If you like the sound of your photograph becoming an international cloud reference image, you can sign up and find our more on the WMO Image Submission page.