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Main Cloud Types
- Cumulus
- Stratus
- Stratocumulus
- Altocumulus
- Altostratus
- Cirrus
- Cirrocumulus
- Cirrostratus
- Nimbostratus
- 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
- Horseshoe vortex
- Humilis
- Incus
- Intortus
- Lacunosus
- Lenticularis
- Mamma
- Morning Glory Cloud
- Murus (Wall cloud)
- Mediocris
- Nacreous
- Nebulosus
- Noctilucent
- Pannus
- Perlucidus
- 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
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.
Cumulus spotted over New Taipei, Taiwan
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Primary and secondary rainbows spotted by Christina's friend, Kala Zorn, over Uluru-Kata Tjuta National Park, Northern Territory, Australia
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Cumulus clouds that formed the shape of lips over Sanxia District, New Taipei City, Taiwan
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Sun Pillar at sunset over Sumirago, Varese, Italy
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Corona spotted over Damyns Hall Airfield, Essex, England
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Multiple contrails heading towards the horizon, spotted over Atago Bridge, Fukuoka City, Japan
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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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Multiple examples of what appear to be horseshoe vortices spotted over Ringwood, Melbourne, Australia
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Cumulus congestus spotted over the mountains in Taiwan
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Altocumulus floccus resembling popcorn, spotted over Falls Church, Virginia, US
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The morning sky over the agricultural fields near Greenfield, California, US
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Cumulus mediocris spotted over Lisboa, Portugal
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A variety of Altocumulus cloud formations spotted on a Spring day along the Blue Ridge Mountains, near Bedford, Virginia, US
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Stratocumulus spotted over Cellerdyke, Scotland
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