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Main Cloud Types
- Cumulus
- Stratus
- Stratocumulus
- Altocumulus
- Altostratus
- Cirrus
- Cirrocumulus
- Cirrostratus
- Nimbostratus
- Cumulonimbus
Other Clouds
- Arcus
- Asperitas
- Cap / banner clouds
- Capillatus
- Castellanus
- Cataractagenitus
- Cauda (Tail cloud)
- Cavum (Fallstreak hole)
- Congestus
- Contrail (homogenitus)
- Duplicatus
- Diamond dust
- Distrail
- Fibratus
- Flammagenitus (Pyrocumulus)
- Floccus
- Fluctus (Kelvin-Helmholtz)
- Fractus
- Homogenitus
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- Intortus
- Lacunosus
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- Mamma
- Morning Glory Cloud
- Murus (Wall cloud)
- Mediocris
- Nacreous
- Nebulosus
- Noctilucent
- Pannus
- Perlucidus
- Pileus
- Praecipitatio
- Radiatus
- Silvagenitus
- Spissatus
- Stratiformis
- 'Supercilium' (not official classification)
- Translucidus
- Tuba / Twister
- Uncinus
- Undulatus
- Velum
- Vertebratus
- Virga
- Volutus (Roll cloud)
Optical Effects
- 22° Halo
- 46° Halo
- Circumhorizon Arc
- Circumscribed halo
- Circumzenithal Arc
- Cloudbow / Fogbow
- Corona
- Crepuscular rays & shadows
- Diffuse arcs
- Green flash
- Glory
- Halos
- Helic arc
- Infralateral arc
- Iridescence
- Lower Sun Pillar
- Lower Tangent Arc
- Moonbow
- Moondogs
- Parhelic circle
- Parry antisolar arcs
- Parry arc
- Parry infralateral arc
- Parry supralateral arc
- Rainbow
- Sub parhelion
- Sub-sun
- Suncave parry arc
- Sun dog (Parhelion)
- Sun pillar
- Supernumerary bows
- Subparhelic circle
- Supralateral arc
- Upper tangent arc
- Wegener arc
Pileus, also known as a cap cloud, can develop above rapidly rising cumulus or cumulonimbus clouds, as spotted here by Genevieve's father during an evening walk in Minneapolis, Minnesota, US
Pileus spotted over Hunting Island, South Carolina, US
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A classic example of pileus spotted over Curitiba, Brazil
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Pileus with iridescence spotted over Mantua, New Jersey, US
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Pileus spotted over Cotia, Sao Paulo, Brazil
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A dynamic, mixed sky over Schleiz, Germany
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Pileus spotted over Madison, Wisconsin, US
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Pileus on a stormy day over North Devon, England
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Pileus on the tops of cumulus congestus, spotted over Madison, Wisconsin, US
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A large cumulus congestus cloud formation that Bronwyn was hoping would produce some rain following a spell of hot weather, but it dissipated without leaving any rain in its wake, spotted near Pittsboro, North Carolina, US
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Pileus spotted over Curitiba, Brazil
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Cumulus congestus with pileus above, as seen from an airplane along the East Coast of North America
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Pileus over Parkersville, United States
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Sunrise with altocumulus lenticularis and pileus over the Adirondack Mountains, near Vermontville, New York, US
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A developing cumulonimbus that Bob observed was capped with a black heart sitting in front of a silver heart, spotted on the Kapiti Coast, north of Wellington, New Zealand
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Pileus over Biga, Indonesia
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