Editing Cloud (section)

====Accessory clouds====
Supplementary cloud formations detached from the main cloud are known as [[accessory cloud]]s.<ref name="clouds - species and varieties" /><ref name="Aerographer2012" /><ref name="features" /> The heavier precipitating clouds, nimbostratus, towering cumulus (cumulus congestus), and cumulonimbus typically see the formation in precipitation of the ''pannus'' feature, low ragged clouds of the genera and species cumulus fractus or stratus fractus.<ref name="pannus" />

A group of 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,<ref name="GarretI">{{Cite journal |last1=Garrett |first1=T. J. |last2=Dean-Day |first2=J. |last3=Liu |first3=C. |last4=Barnett |first4=B. |last5=Mace |first5=G. |last6=Baumgardner |first6=D. |last7=Webster |first7=C. |last8=Bui |first8=T. |last9=Read |first9=W. |last10=Minnis |first10=P. |year=2006 |title=Convective formation of pileus cloud near the tropopause |journal=Atmospheric Chemistry and Physics |volume=6 |issue=5 |pages=1185–1200 |bibcode=2006ACP.....6.1185G |doi=10.5194/acp-6-1185-2006 |hdl-access=free |hdl=2060/20080015842 |s2cid=14440075 |doi-access=free }}</ref> 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.<ref name="features" /> An accessory cloud recently officially recognized by the World Meteorological Organization is the ''flumen'', also known more informally as the ''beaver's tail''. It is formed by the warm, humid [[inflow (meteorology)|inflow]] of a super-cell thunderstorm, and can be mistaken for a tornado. Although the flumen can indicate a tornado risk, it is similar in appearance to pannus or [[scud (cloud)|scud]] clouds and does not rotate.<ref name=ICA2017/>