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Main Cloud Types
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- 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
- Horseshoe vortex
- Humilis
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- Intortus
- Lacunosus
- Lenticularis
- Mamma
- Morning Glory Cloud
- Murus (Wall cloud)
- Mediocris
- Nacreous
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- Noctilucent
- Pannus
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- 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
Altocumulus radiatus indicates instability at mid-atmospheric levels and often signaling approaching stormy weather. This was true in this case as Bernhard indicated that it rained only two hours later, near the English Garden, Munich, Germany.
A developing storm system near Place de la Concorde, Paris, France
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Altocumulus lenticularis spotted overhead during a salmon fishing expedition in Argentina
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Asperitas with signs of lacunosus spotted over Sacramento, California, US
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Cirrocumulus undulatus with signs of lacunosus, spotted over Lake Stevens, Washington, US
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Altocumulus stratiformis undulatus, also known as a 'mackerel sky', spotted over Penobscot Bay, Maine, US
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Precipitation both reaching the ground from this storm system and dissipating prior to the ground, with the latter known as Virga, as seen here over Somerset, England
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Crepuscular rays over Taipei, Taiwan
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A spectacular example of a multi-layered Altocumulus lenticularis duplicatus, also known as 'pile d'assiettes', spotted by Keith Johnson while salmon fishing in the Andes, Argentina
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A classic example of a Horseshoe Vortex spotted over Eldorado, Santa Fe, New Mexico, US
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Supercilium are short-lived cloud formations that resemble eyebrow-like features and appear in turbulent airflow over, and to the immediate lee of, steep mountain peaks, as spotted here over Santa Barbara, California, US
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22-degree halo spotted over Portland, Oregon, US
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Primary and secondary rainbows spotted by Christina's friend, Kala Zorn, over Uluru-Kata Tjuta National Park, Northern Territory, Australia
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Cirrus uncinus spotted over Boca Raton, Florida, US
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Crepuscular rays spotted over Sizihwan Bay, near Kaohsiung, Taiwan
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A corona spotted during a walk in the forest in the Sacramento Mountains, near aptly-named Cloudcroft, New Mexico, US
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