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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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- Flammagenitus (Pyrocumulus)
- Floccus
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- Fractus
- Homogenitus
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- Morning Glory Cloud
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- Mediocris
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- Pileus
- Praecipitatio
- Radiatus
- Silvagenitus
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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
Signs of a corona and undulatus in this view from the Austrian Alps, on a day that Tobias said brought strong North Föhn winds, which is a warm, dry and gusty downslope wind when the air moves from north to south. This high altitude perspective was spotted over St. Anton am Arlberg, Austria.
Cirrocumulus with signs of lacunosus, spotted over Rufford, West Lancashire, England
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Altocumulus lenticularis spotted overhead during a salmon fishing expedition in Argentina
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Remnants of contrails populate the sky, headed towards the horizon near Lexington, Massachusetts, US
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A sunset sky that looks like a painting, accompanied by virga over San Francisco, California, US
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Sunset over Lake Hiawatha, Minneapolis, Minnesota, US
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Sunset viewed from above, on a flight from Chicago, Illinois, to Columbia, Missouri, US
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Altostratus over Saeeda Al-Sawaleha, Saudi Arabia
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Altostratus spotted over Saeeda Al-Sawaleha, Saudi Arabia
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Following a gray and featureless day, this was the view shortly after sunset over Arnhem, The Netherlands
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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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Sunrise over the Pacific Ocean, making it's way through a shield of clouds, spotted from Xincheng Township, Hualien, Taiwan
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Sun Pillar at sunset over Sumirago, Varese, Italy
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Crepuscular rays spotted shortly after sunrise over Madison, Wisconsin, US
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A tiny face appears in the clouds over Estrella Foothills, Arizona, US
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Sunset over Somerset, England
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