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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
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- Fractus
- Homogenitus
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- Lacunosus
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- Morning Glory Cloud
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- Mediocris
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- Noctilucent
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- Pileus
- Praecipitatio
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- '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
Circumhorizon Arc over Northern California, US
Altocumulus undulatus on a windy day near Taylor, Texas, US
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A layer of stratocumulus near Obninsk, Russia
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Cumulus congestus developing into a potential storm near Bradford West Gwillimbury, Ontario, Canada
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Sunrise over Falls Church, Virginia, US
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Contrails and a slice of the moon after sunset over North Devon, England
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Lacunosus clouds, the honeycombs of the sky, spotted over Oakland, California, US
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A storm near the St. Lawrence River, spotted from North Dundas Township, Ontario, Canada
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A dynamic and mixed sky over Brisbane, Australia
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Chasing the sun while flying between cloud layers, as seen over the Pacific Ocean on the way to Japan
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A storm system on the horizon during what Kay said was a wild weather day for the entire coast, with high surf warnings and unseasonably warm temperatures. A great place for cloudspotting, as Kay and her friend, another CAS member, Helen Shorten, were adding clouds into Kay's Cloud Collector Handbook, as spotted near Tilba Tilba on the south coast of New South Wales, Australia
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Altocumulus undulatus over New Taipei City, Taiwan
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Cumulus congestus near Miaoli City, Taiwan
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Clouds from a winter storm that brought rain to Los Angeles County and snowfall to the San Gabriel Mountains, spotted near Lancaster, California, US
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Crepuscular rays on the horizon, following the passage of a storm near the coast of California, US
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An "owl" enjoying the view of the iridescence over Bahia Loreto National Park, Baja, Mexico
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