Tail cloud: A tail cloud is sometimes seen attached to the wall cloud of a severe thunderstorm. The tail cloud originates from the area of the downdraft, which has a high moisture content due to the precipitation.
A Cumulus humilis cloud forming with a larger storm system.
Fractocumulus looks like unorganized and unstructured puffs of cumulus cloud. Dissipating, small convective clouds such as cumulus humilis and medicris often transform into fractocumulus. Fractocumulus can also form near or under thunderstorms and is then termed scud.
Scud Clouds: Fractocumulus-like cloud rags, sometimes appearing in the precipitation region of a storm. They are caused by condensation of water vapor in air below the cloud base, due to the high air moisture in the precipitation region.
