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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
- Incus
- Intortus
- Lacunosus
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- Morning Glory Cloud
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- 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
Group two of the Cloud Appreciation Society Sky Holiday in Blachford Lake Lodge: Sarah Acland (Member 40874), Suzanne Cengia (Member 33510), Lucas Chen (Member 36273), Frank Corral, Laurie Ann Corral (Member 41099), Mark Donovan (Member 37083), Patrizia Donovan (Member 37084), Brian MacEachern, Anne Mattison (Member 38449), Barbara Richardson (Member 40896), Mark Richardson (Member 42827), William Tarr, Connie Tarr (Member 20744), Elyn Zimmerman (Member 25359).
Fog over Saseenos, Canada
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Shreds of Stratus, known as Stratus fractus, on the slopes near the Blackfoot River in Montana, US.
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Rainbow over Oostelbeers, The Netherlands
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Intense rainbow action spotted over Durham, North Carolina, US, including a primary bow, a secondary bow, supernumerary bows (tiny fringes inside the primary bow) and Alexander’s Dark Band (the darker sky between the bows).
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Altocumulus illuminated by the rays of sunrise with lower Stratocumulus lenticularis formations in shadow over Whiteface Mountain, Adirondack Mountains, NY, US.
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Altocumulus lacunosus spotted in the evening over Baltimore, Maryland, US.
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Altocumulus undulatus clouds spotted over Baltimore, Maryland, US.
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Moonlit Stratocumulus undulatus clouds spotted over Brisbane Water, Woy Woy, NSW, Australia.
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Fair-weather Cumulus spotted over Gross Valley in the Blue Mountains, New South Wales, Australia.
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The variety of the high cloud Cirrocumulus known as lacunosus, which is characterised by a lattice of holes.
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A UFO-shaped Altocumulus lenticularis formation, and eyebrow-like features, with the unofficial name supercilium, forming in the turbulent air in front, spotted over Palm Springs, California, US.
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Asperitas over Winsted, United States
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Altocumulus undulatus over East River, New York City, US.
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A 22-degree halo formed by Cirrostratus cloud and some cloud iridescence formed by Cumulus fractus, spotted over Zoetermeer, South Holland, Netherlands.
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Fallstreak Hole over Wittmann, United States
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