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Main Cloud Types
- Cumulus
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- Altostratus
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- Cirrocumulus
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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
- Fluctus (Kelvin-Helmholtz)
- Fractus
- Homogenitus
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- Humilis
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- Intortus
- Lacunosus
- Lenticularis
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- Morning Glory Cloud
- Murus (Wall cloud)
- Mediocris
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- Noctilucent
- Pannus
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- Pileus
- Praecipitatio
- Radiatus
- Silvagenitus
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- 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 display of rays and shadows over northern California, US.
A dynamic and vivid sunset near Lexington, Virginia, US
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Altocumulus perlucidus spotted over Sanxia, New Taipei City, Taiwan
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Sunrise over Central Province, Iran
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Cumulus spotted over Modbury Heights, Adelaide, South Australia, Australia
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Mid-morning iridescence over Lebec, California, US
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Winter solstice sky over Rocky Mount, Virginia, US
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Mammatus (Mamma) spotted in the morning sky over Arlington, Virginia, US
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Winter Solstice sunrise mirrored in texture upon a frozen lake in Southern Alberta, Canada
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Fallstreak Hole (Cavum) in the shape of a heart and with a view of the blue sky, spotted following a week of rain in Waikiki, Honolulu, Hawaii, US
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A storm with mammatus (mamma) spotted over Estrella, Arizona, US
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An 'X' created by contrails over Falls Church, Virginia, US
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Altocumulus undulatus spotted over Hamakua Coast, Hawaii, US
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Altocumulus lenticularis spotted above a layer of stratocumulus, shortly before a storm over Canutillo, Texas, US
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Sunset following a storm over Canberra, Australia
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Lacunosus, a relatively rare and short-lived cloud formation, takes on the look of a honeycomb pattern of round holes with frayed edges. It is formed when a layer of rising warm air and a layer of cold air come into contact with one another, causing downdrafts that push through the cloud. This classic example was spotted by Alexia's friend, Bob Hunter, near Lexington, Virginia, US.
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