abstract Australia background blue-sky cloud clouds colored colors coloured colours conditions feathery fine formations light movement patterns shapes skies sky southern spread spreading streaky sun textures thin vaporish vapourish variations various-cloud-formations warm weather white wispy appearance blue extremely-hot heat hot puffs summer angled angles blended direction directional lines pointers pointing aerial aeroplane airplane behind condensation-trail contrail following jet jet-engine-exhaust line moisture streaks trail trailing vapor vapour atmosphere atmospheric cloud-formations meteorological-phenomenon rib-like ribcage ribs climate climatology curled curved sky-hook wind