If
based on cloud base height, the ten principal cloud types can then grouped into four cloud
types:
ü High
clouds --
cirrus, cirrostratus, cirroscumulus.
ü Middle
clouds –
altostratus and altocumulus
ü Low
clouds –
stratus, stratocumulus, and nimbostratus
ü Clouds
with extensive vertical development – cumulus and cumulonimbus.