Luke Howard noticed that clouds often have features of two or more categories, such as cirrus + stratus, cumulus + stratus, etc. Based on these observations, he suggested modifications (or combinations) of the core four clouds between categories. This research served as the starting point for the ten basic types of clouds we o Clouds are classified into four main groups, viz., low-, middle- and high level clouds and clouds with vertical development. The above classes are further subdivided, either based on texture or other important characteristics, to provide an easier way to identify the various cloud types. Learn about the classification and nomenclature of clouds in the troposphere, stratosphere, and mesosphere. See tables, charts, and images of different cloud forms, genera, species, and varieties. Learn about the 10 basic types of clouds and how to identify them based on their altitude, shape, and features. Find out what kind of weather they produce and see examples and worksheets.