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
An abundance of distinct fallstreak holes (cavum), also known as 'hole punch clouds', are formed when supercooled water droplets freeze into ice crystals and fall out, often triggered by a passing airplane. These classic examples were spotted over Prescott Valley, Arizona, US.
Fallstreak Hole (Cavum) with falling ice crystals, spotted near Elsenham, London Stansted Airport, England
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A unique view of two Fallstreak Holes (Cavum), along with the sun located 'in' the smaller one, spotted over Harkness State Park Beach, Waterford, Connecticut, US
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Fallstreak Hole (Cavum) spotted over Sedro Woolley, Washington, US
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Fallstreak Hole (Cavum) spotted near the time of sunset, over Athens, Georgia, US
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Fallstreak Hole (Cavum) in the shape of a heart and with a view of the blue sky, spotted following a week of rain in Waikiki, Honolulu, Hawaii, US
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A larger fallstreak hole (cavum) accompanied by a smaller one, spotted over Arlington, Washington, US
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Fallstreak Hole (Cavum) spotted over Conwy, North Wales
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A classic example of a fallstreak hole (cavum) within a layer of altocumulus, with signs of iridescence near the leading edge of the descending ice crystals, spotted over Lyons, Oregon, US
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Fallstreak Hole (Cavum) spotted over Acton, Dorset, England
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An elongated fallstreak hole (cavum) spotted over Montauriol, France
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Fallstreak Hole (Cavum) spotted while driving near Elgin, Moray, Scotland
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Fallstreak Hole (Cavum) spotted over Northern Scotland
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Fallstreak Hole (Cavum) spotted over Anduze, France
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Fallstreak Hole (Cavum) spotted over Leichhardt, New South Wales, Australia
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Fallstreak Hole (Cavum) spotted over Sydney, Australia
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