#2185: Cumulonimbus
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[Drawing of a small cloud with with a label beneath:]
Cumulus
[Drawing of a medium sized tall hourglass shaped cloud with a label beneath:]
Cumulonimbus
[Drawing of a large cloud, larger at the top than at the bottom, with a label beneath:]
Cumulonimbulonimbus
[Drawing of a huge and very complicated cloud in three layers, with a label beneath:]
Cumulonimbulonimbulocumulonimbus
(Sourced from explainxkcd.com)
Title text:The rarest of all clouds is the altocumulenticulostratonimbulocirruslenticulomammanoctilucent cloud, caused by an interaction between warm moist air, cool dry air, cold slippery air, cursed air, and a cloud of nanobots.