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
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.
Fluctus (Kelvin-Helmholtz) spotted in the early morning over the Missouri River near Wolf Creek, Montana, US
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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.
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Fluctus, (Kelvin-Helmholtz), near Bremen, Northern Germany.
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A Fluctus (Kelvin-Helmholtz), formation over Bude, Cornwall, England.
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A Kelvin-Helmholtz formation over Big Bend, Texas, US.
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Kelvin-Helmholtz waves over LaGuardia in Northern Spain.
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Kelvin-Helmholtz waves over Naseby, central Otago, New Zealand.
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Kelvin-Helmholtz clouds over Rayleigh, Essex, England.
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A Kelvin-Helmholtz formation over Boriquen Airport, Aguadilla, Puerto Rico, US.
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A Kelvin-Helmholtz (fluctus) formation over West Texas, US.
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A Kelvin-Helmholtz (fluctus), formation over Peveril Point, near Swanage in Dorset, England.
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Kelvin Helmholtz waves breaking over Warriewood Beach, Sydney, Australia.
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Waves over Vashon Island, Washington State, US.
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A Kelvin-Helmholtz formation, spotted on a flight to Tasmania.
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A Kelvin–Helmholtz wave formation over Smith Mountain Lake, Virginia, US.
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