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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
The distinctive breaking-wave shape of a fluctus cloud feature was spotted here along the top of the accessory cloud cap known as a pileus. This is a rare combination of features, spotted over Franklin County, AL, US.
Parallel ridges of Altocumulus cloudlets, known as undulatus, going this way and that at two different levels, known as duplicatus.
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The flying-saucer cloud, Altocumulus lenticularis, spotted over Stellenbosch in the Western Cape, South Africa by Stuart Loveday, who assured us ‘no aliens were spotted by me that day’.
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Cumulonimbus capillatus storm cloud over Cornville, Arizona, US. This is the appearance of a storm cloud at its most mature stage of development.
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An aircraft condensation trail with the 'zipper' appearance that can sometimes be produced by the effect of turbulence around the aircraft wings.
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Cirrocumulus spotted over Antelope Valley, California, US.
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Crepuscular rays over Umbria, Italy.
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Undulatus over Maui, Hawaii, US.
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A lunar halo over the Sierra de las Nieves national Park in Tolox, Andalucia. Spain.
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A classic UFO-like lenticularis over Torres del Paine, Chile.
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A murus formation emerging from a storm system over Didsbury, Alberta, Canada.
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Anti-crepuscular rays over Cascavel, Paraná, Brazil.
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A sunrise over Whiteface Mountain, Adirondack Mountains, New York, US.
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Altocumulus floccus over San Blas, Mexico.
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A glory spotted on approach to Heathrow Airport. London, England.
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Cirrus uncinus over Perth, Western Australia.
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