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Main Cloud Types
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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
- 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
Fluctus (Kelvin-Helmholtz) is a short-lived phenomenon that occurs when there is a strong vertical wind shear between two air streams, causing winds to blow faster at the upper level than at the lower levels. This example was spotted over Teddington, London, England.
Sun Pillar at sunset over Point, Isle of Lewis, Scotland
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Anti-crepuscular rays can sometimes be viewed when looking opposite of the setting sun, as they appear when tall clouds in front of the rising or setting sun cast long shadows across the sky, which can be seen receding off into the distance when facing away from the Sun. This classic example was spotted over Scottsbluff, Nebraska, US.
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Crepuscular rays over the Lagoon of Venice, Italy
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Undulatus over Curtin, Canberra, Australia.
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A cloud 'duvet' on the peaks near the Flathead River, Charlo Montana, US.
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A sun pillar at sunset over Aubusson in Central France.
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Undulatus at sunrise over Norfolk, England.
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Undulations over Norwich, UK.
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A classic Altostratus filled sky over the Queen’s Park suspension bridge, Chester, UK.
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An extensive weather front over Goolwa Beach, South Australia.
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Undulations in Altostratus over Somerset, UK.
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A Glory spotted on a flight to La Crosse, Wisconsin, US.
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A large lenticular formation over Tenerife.
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The sun breaking through a layer of cloud over Curtin, Canberra, Australia.
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A glory spotted on a flight from Washington, to Chicago, US.
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