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Main Cloud Types
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Other Clouds
- Arcus
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- Cap / banner clouds
- Capillatus
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- Cataractagenitus
- Cauda (Tail cloud)
- Cavum (Fallstreak hole)
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- Contrail (homogenitus)
- Duplicatus
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- Fractus
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- Morning Glory Cloud
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- Mediocris
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- '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.
Virga over the Northeast Canadian High Arctic
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Altocumulus lenticularis duplicatus, also known as 'pile d'assiettes', over the Sandia Mountains, Albuquerque, New Mexico, US
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Altocumulus stratiformis undulatus, also known as a 'mackerel sky', spotted over Archer, Florida, US
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Altocumulus lenticularis duplicatus spotted over the Alps Mountains, near Wagrain, Austria
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A dynamic, sideways-appearing Altocumulus lenticularis spotted over Fagurholsmyri, Iceland
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Multiple examples of Altocumulus lenticularis spotted near Portobello, Scotland
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Crepuscular rays over Wembury Beach, Devon, England
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Fluctus (Kelvin-Helmholtz) spotted over San Diego, California, US
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A rare juxtaposition of Fluctus (Kelvin-Helmholtz) with Altocumulus lenticularis duplicatus, spotted during a geomorphology-focused field trip, wherein Oscar was captivated by what was unfolding above on this windy day near Mt. Cook/Aoraki, Tasman Valley, New Zealand
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Altocumulus lenticularis spotted near majestic Mt. Rainier (Tahoma), Seattle, Washington, US
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Altocumulus lenticularis duplicatus, also known as 'pile d'assiettes', spotted over Horseshoe Bay, Stewart Island, New Zealand
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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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A unique juxtaposition of Altocumulus lenticularis and Fluctus (Kelvin-Helmholtz) spotted on the lee side of the Rocky Mountains in Berthoud, Colorado, US
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Fallstreak Hole (Cavum) spotted over Sedro Woolley, Washington, US
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