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Other Clouds
- Arcus
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- Cap / banner clouds
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- Fractus
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- Morning Glory Cloud
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- 'Supercilium' (not official classification)
- Translucidus
- Tuba / Twister
- Uncinus
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- Velum
- Vertebratus
- Virga
- Volutus (Roll cloud)
Optical Effects
- 22° Halo
- 46° Halo
- Circumhorizon Arc
- Circumscribed halo
- Circumzenithal Arc
- Cloudbow / Fogbow
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- 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
Lacunosus, a rare, short-lived formation, is identified in terms of the gaps between cloud elements, rather than the clouds themselves. It is when a cloud layer is composed of more or less regular holes, around which fringes of cloud form, like a net or rough honeycomb. The holes of this variety are formed by sinking pockets of air, and the cloud fringes around them by air rising up between the pockets to replace them. Such sinking can occur when a layer of cooler air finds itself over a warmer one. Being more dense, the cooler air sinks down through the warmer air. This classic example was spotted on a cold morning over Priddy, Somerset, England.
Sun Pillar over Solvang, United States
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Fluctus (Kelvin-Helmholtz) spotted near Antelope Valley, California, US
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Sunset over Mendip Hills, England
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Storm system over Hohnstein, Saxony, Germany
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"Sunset Inferno, South Jersey", as titled by Joseph's daughter, who spotted this near Cherry Hill, New Jersey, US
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Crepuscular rays shining over a line of cumulus congestus, accompanied by its reflection in the water, spotted by Tanja on a meaningful trip to Newfoundland, Canada
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Cumulonimbus over Panton, Jamaica
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Mamma (Mammatus) spotted over Las Vegas, Nevada, US
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On an early frosty morning, there are signs of supercilium developing amongst the stratocumulus clouds over the Mission Mountain Range near Charlo, Montana, US
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Cumulus fractus that Robyn likens to a misty face hovering above, spotted over Goodyear, Arizona, US
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Signs of both mamma (mammatus) and asperitas in this view over Antelope Valley, California, US
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Stratocumulus over New Taipei CIty, Taiwan
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Altocumulus stratiformis over New Taipei City, Taiwan
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A colorful display over Perth, Scotland
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Stratus over Choghakhor Lagoon, near Chaharmahal and Bakhtiari Province, Iran
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