Australian Weather Calendar: Cover 2017
Mieke Bonyton watched a single, thin cloud cross the sky over the mudflats of Derby, in the Kimberley region of Western Australia, then do a loop above the boab trees just as the sun was setting.
Clouds vary in colour from white to dark grey. As light passes through the water molecules and ice crystals and in the cloud, it is scattered in all directions. The more water or ice is in the cloud, the more the light will scatter and the less light will reach an observer, making the cloud appear darker.