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Other Clouds
- Arcus
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- Cap / banner clouds
- Capillatus
- Castellanus
- Cataractagenitus
- Cauda (Tail cloud)
- Cavum (Fallstreak hole)
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- Duplicatus
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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
- 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
Noctilucent
A fraction of a Circumzenithal Arc, with its 'upside-down' rainbow colours, visible via the confines of this cirrus cloud, spotted over Bayramiç, Çanakkale, Turkey
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Cumulus congestus taking on a look of a chick being hatched, spotted over Warsaw, Poland
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Altocumulus lenticularis spotted over Western Iran
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Reflections of the sky over Sacramento, California, US
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Fog along the Bieszczady Mountains, Poland
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Snow showers falling on Isle of Harris, Scotland
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Overcast near Ellesmere Port, Cheshire, England
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Sunset over Vermontville, Adirondacks, New York, US
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Following multiple weeks of rain, the blue sky was seen again over Blairgowrie, Perthshire, Scotland
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Circumzenithal Arc, also known as an 'upside-down rainbow', spotted by Richard's son, Graham Friedman, on a beautiful, calm day over Malibu, California, US
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Early evening sky over São Paulo City, Brazil
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Subtle signs of Fluctus (Kelvin-Helmholtz) spotted over Sky Valley, California, US
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An abundance of distinct fallstreak holes (cavum), also known as 'hole punch clouds', are formed when supercooled water droplets freeze into ice crystals and fall out, often triggered by a passing airplane. These classic examples were spotted over Prescott Valley, Arizona, US.
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A mixed sky at sunset over Middlesex, New York, US
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A colourful sunrise over Brighton, Colorado, US
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