To a camera enthusiast a good cloud can really "make" a picture. To the pilor of a plane, a cloud may be something to avoid. For those interested in the weather, "to know your clouds" is to know much about weather forecasting.
Shaw, R. H. and Elford, C. R.
"Clouds - The Signposts of the Sky,"
Iowa Farm Science: Vol. 12
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol12/iss12/2