What distinguishes Towering Cumulus (TCU) clouds from other clouds?

Towering Cumulus (TCU) clouds are characterized by their rapid vertical growth, which often leads to the development of precipitation. Unlike other types of clouds, TCU clouds form under conditions of strong atmospheric instability. As they grow, they can evolve into cumulonimbus clouds, which are associated with significant weather phenomena, including thunderstorms and heavy rain.

Their ability to rise quickly and generate precipitation is a key distinguishing factor from other cloud types that may not have the same potential for rapid growth or precipitation. TCU clouds typically signify a transition in weather conditions and can serve as indicators of impending storm activity.

In contrast, while TCU clouds may be larger than typical cumulus clouds, they are not always gray in color, as they can appear white when sunlight illuminates them. Additionally, the base of TCU clouds is not flat; they often have a more billowy or rounded appearance due to their vertical development.