Stratus clouds - Are low - level clouds that are characterized by horizontal layering with a uniform base (horizontal layer)
Nimbostratus - low level clouds that have thick uniform gray. Layer from rain and snow often fall with no thunder or lighting .
Cumulus - rounded heaping on each other above a flat base at a low altitude
Altostratus- clouds that form a continuous uniform layer that is like stratus but occur at a medium altitude .
Altocumulus- clouds that are a forming layer of rounded masses at a level base that occur at a medium altitude.
Cumulonimbus - a cloud that forms a towering mass that has a flat base at a low altitude also has a flat base as in thunderstorms .
Cumulonimbus - a cloud that forms a towering mass that has a level base that occur at a low altitude and is flat top as in thunderstorms
Cirrus - clouds that form a wispy streaks at a high altitude .