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
Fallstreak Hole (Cavum) with a "tail" that Nigel said extended beyond what was captured in this photograph by approximately three times the length seen here, spotted over Newton upon Rawcliffe, Yorkshire, England.
A classic example of a fallstreak hole (cavum) spotted amidst an expansive display of altocumulus clouds over Lot, Occitanie, France
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Cavum (Fallstreak Hole) spotted over Lynchburg, Virginia, US
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Fallstreak Hole (Cavum) over Catforth, Preston, England
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A spectacular fallstreak hole (cavum) spotted near Seattle, over Snohomish, Washington, US
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A classic fallstreak hole (cavum) over Charlotte, Michigan, US
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Cavum (Fallstreak Hole), which is formed when part of the cloud layer forms ice crystals which are large enough to descend as a "fallstreak". They form in clouds of supercooled water droplets, which in the end, creates a form of virga, a trail of ice crystals that doesn’t reach the ground, but evaporates before getting that far. This classic example was spotted over Charlotte, Michigan, US.
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Cavum (Fallstreak Hole) is essentially, in the end, a form of virga, wherein a particular trail of ice crystals doesn’t reach the ground, but instead, evaporates prior to that point. This classic example was spotted over Seaford, East Sussex, England.
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A classic example of a Cavum (Fallstreak Hole) over Longham, Dorset, England
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Fallstreak holes over Cotia, São Paulo, Brazil
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Cavum, also known as a Fallstreak hole, spotted over the University of Alaska in Fairbanks, Alaska, US
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A fallstreak hole over Beverly, Massachusetts, US.
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A fallstreak hole over Port Solent, England.
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A fallstreak hole over Epen, Netherlands.
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A fallstreak hole over Erm, Netherlands.
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A fallstreak hole over Bremen, Northern Germany.
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