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Main Cloud Types
- Cumulus
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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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- Flammagenitus (Pyrocumulus)
- Floccus
- Fluctus (Kelvin-Helmholtz)
- Fractus
- Homogenitus
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- 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
A colourful sunset over Northern California, US
Mammatus (Mamma) at sunset near Sacramento, California, US
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Undulatus spotted by Dan's friend, John Maltese, from the shore of Lake Pleasant in the southern Adirondacks, Speculator, New York, US
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Sunset over Puget Sound near Edmonds, Washington, US
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Sunset over Kingsthorpe, Northampton, England
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A unique juxtaposition of clouds and light, yielding a sight that is ripe for the imagination, spotted over Gaw Hill, Ormskirk, England
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A vibrant sunset over Odo Yacht Harbor, Fukuoka City, Japan
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Signs of noctilucent clouds as Simon travelled overnight across the Atlantic Ocean, approaching Dublin, Ireland
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Crepuscular rays over Yeonil, Namgu, Pohang, South Korea
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A colourful sunset over Columbia, Missouri, US
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Crepuscular rays over Wyncote, Pennsylvania, US
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Summer sunset over Rumwell, Somerset, England
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A developing storm at sunset over Brighton, Colorado, US
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Sunset over Nagano Station, Japan
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Undulatus at sunrise over Northern California, US
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Sunset over Momochi Seaside Park, Fukuoka City, Japan
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