Vertically Developed Clouds
Cumulus-type clouds are those that primarily exhibit vertical development. Two of the more common types are the cumulus and cumulonimbus.
appear as small, cotton ball-like clouds that generally form by
convection. Cumulus are also called "fair-weather" clouds as
pleasant conditions usually prevail while they are around.
Cumulonimbus clouds form during very unstable conditions. They are the tallest clouds, and can reach to the stratosphere. Cumulonimbus clouds are associated with thunderstorms capable of generating locally high winds, hail, lightning, and torrential down pours.