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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
Altocumulus stratiformis undulatus, also known as a mackerel sky, was captured by Carl McGarrigle, who also remarked 'I forgot to iron the sky this morning'. This classic example was spotted over Preston, Lancashire, England.
Cumulonimbus Incus spotted to the northeast of the East Texas Regional Airport, Longview, Texas, US
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Fallstreak Hole (Cavum) spotted over Sydney, Australia
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Altocumulus lenticularis spotted over Gibsons, British Columbia, Canada
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Altocumulus lenticularis spotted at sunrise over the Flatirons, south of Boulder, Colorado, US
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Altocumulus lenticularis spotted over L'Estartit, Catalonia, Spain
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A developing, robust storm near Antelope Valley, California, US
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Lacunosus, a short-lived formation, spotted over Island Beach State Park, New Jersey, US
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Cirrus uncinus over Lelant, England
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Altocumulus lenticularis duplicatus spotted at sunset while looking west over the Spring Mountains, near Las Vegas, Nevada, US
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Crepuscular rays and shadows during sunset over Isle of Lewis, Scotland
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Fallstreak Hole (Cavum) spotted over Dorset, England
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Altocumulus stratiformis undulatus, also known as a 'mackerel sky', spotted over Ipswich, Suffolk, England
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Distrails over Wimborne, Dorset, England
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Altocumulus lenticularis spotted at sunset over the Sangre de Cristo Mountains north of Santa Fe, New Mexico, US
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Multiple fallstreak holes (cavum) spotted over Somerset, England
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