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Main Cloud Types
- Cumulus
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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
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- Fibratus
- Flammagenitus (Pyrocumulus)
- Floccus
- Fluctus (Kelvin-Helmholtz)
- Fractus
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- Intortus
- Lacunosus
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- Morning Glory Cloud
- Murus (Wall cloud)
- Mediocris
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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
Sunrise over Ness Point, Lowestoft, England
Cumulonimbus Incus spotted to the northeast of the East Texas Regional Airport, Longview, Texas, US
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Swirls in the sky over Yeongam-gun, South Jeolla Province, South Korea
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An exquisite display in the early Autumn sky over Mercogliano, Italy
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Fallstreak Hole (Cavum) spotted over Sydney, Australia
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Layers of clouds over São Paulo City, Brazil
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A tumultuous sky over Venice, Italy
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Undulatus in various forms, reminding Holly of an apt quote by Keith Wynn; 'I love that no two cloud formations, since time began, have ever been the same. Each moment in time has created its own unique fingerprint.' This unique representation was spotted over Longmont, Colorado, US.
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Early morning fog over the Missouri River, near Wolf Creek, Montana, US
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A storm system spotted near Sun Moon Lake, Nantou, Taiwan
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Stratocumulus spotted near Göttingen, Germany
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Sunset seen through the window, near the De La Warr Pavilion, Bexhill-on-Sea, England
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Altocumulus over Zhongli, Taiwan
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An approaching storm captured by Paul Powell, near Hubbard Creek Reservoir, Breckenridge, Texas, US
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Altocumulus lenticularis spotted over Gibsons, British Columbia, Canada
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A storm system near Naperville, Illinois, US
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