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Main Cloud Types
- Cumulus
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- 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 example of the Nor'west arch, a formation that occurs when a strong nor'west adiabatic wind flows from the Tasman Sea and over the Southern Alps and onto the Canterbury Plains, New Zealand.
Crepuscular rays prior to an approaching storm over Mercogliano, Italy
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A primary bow and a subtle secondary bow over Denver, Colorado, US
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Undulatus over Burgundy, France
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A mixed sky at sunset that resembles a painting with soft hues, as seen here over Hyderabad, India
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A mixed sky over Arnhem, The Netherlands
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A growing cumulus congestus spotted over North Devon, England
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A developing storm system provided a perspective of an approaching large cloud on a summer evening near Charlo, Montana, US
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Cirrus uncinus spotted over Santa Rosa, California, US
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Cumulus congestus spotted over West Palm Beach, Florida, US
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Asperitas and mammatus (mamma) ahead of a storm system, on one of Helen's best cloud spotting days, near Wells, Somerset, England
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Stratocumulus spotted over Missoula, Montana, US
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A dissipating storm system spotted near Westbury sub Mendip, Somerset, England
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Cumulus spotted on a morning with little wind over Modbury Heights, Adelaide, South Australia
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A blue opening amidst the low-mid level clouds over Taiwan
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Layers of clouds over Payson, Utah, US
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