The World Meteorological Organization classifies most accessory clouds as " supplementary features ".
2.
Supplementary features and accessory clouds are not further subdivisions of cloud types below the species and variety level.
3.
They occur in highly unstable air and often have complex structures that include cirriform tops and multiple accessory clouds.
4.
Nimbostratus pannus is an accessory cloud of nimbostratus that forms as a ragged layer in precipitation below the main cloud deck.
5.
Stratus clouds don't produce accessory clouds, but a supplementary feature "'praecipitatio "'is derived from Latin, which means " precipitation ".
6.
After the pannus types, the remaining accessory clouds comprise formations that are associated mainly with upward-growing cumuliform and cumulonimbiform clouds of free convection . " Pileus " is a cap cloud that can form over a cumulonimbus or large cumulus cloud, whereas a " velum " feature is a thin horizontal sheet that sometimes forms like an apron around the middle or in front of the parent cloud.
7.
However, he also proposed and had accepted by the permanent committee of the International Meteorological Organization ( IMO ), a forerunner of the present-day World Meteorological Organization ( WMO ), the designation of a new free-convective vertical or multi-�tage genus type, cumulonimbus ( heaped rain cloud ), which would be distinct from cumulus and nimbus and identifiable by its often very complex structure ( frequently including a cirriform top and what are now recognized as multiple accessory clouds ), and its ability to produce thunder.
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