Daily Mail: 'Asperatus' clouds (chem-clouds) seen across the world Gavin Pretor-Pinney, from Somerton, who also founded the Cloud Appreciation Society, wants recognition for what he has named the asperatus cloud.
Weather: Fill the cup with water. Put shaving cream on top for a cloud. Explain that when clouds get really heavy with water, it rains! Then put blue food coloring on top of the cloud, and watch it rain.