air atmosphere birds blue cirrus cloud cloud formation clouds cumulus flock of birds meteorology nature rain skies sky soft stratus swarm of birds water weather wheather white colored colors coloured colours conditions fine formations light shapes southern sun textures thin vaporish vapourish variations various cloud formations wispy clouded dark formation gray grey heavy huge massive structures above abstract aeroplane airplane appearance below between cloud-formations flight high in-between layers levels multi-level patterns plane shadows sunlight travel up-above variety various various-cloud-formations weather-indicators