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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
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.
A developing cumulonimbus spotted by Anuja's sister, Tanuja Prasad, over Sahastradhara, a hill station in the foothills of the Himalayas, in Himachal Pradesh, India
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A view of the moon in between the clouds over Esfahan, Iran
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The breakdown of a contrail, spotted over Great Crag, Watendlath, English Lake District, England
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A developing storm system that Damian thought resembled a big cloud talking to a small cloud, spotted over Alabama, US
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Altocumulus over Vermontville, Adirondacks, New York, US
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Cumulus over Twisp, Washington, US
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The union of clouds and sea, as Santiago reflects on traditional Chinese mythology, evokes a sense of vastness, eternity, and selflessness. This depiction of such a union was spotted near Xiangshuiwan Community, Lingshui County, Hainan Province, China.
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Puffs of white throughout the sky over Wimborne, Dorset, England
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Altocumulus lenticularis spotted near Combe Hay, Bath, England
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Cumulus fractus populating the sky over Northern California, US
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Noctilucent spotted at approximately 3:00 AM local time over Rechitsa, Belarus
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A unique juxtaposition of clouds and light, yielding a sight that is ripe for the imagination, spotted over Gaw Hill, Ormskirk, England
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A storm system that rolled in quickly, accompanied by heavy rain, spotted by Ellen Hatley over Winnipeg, Manitoba, Canada
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A vibrant sunset over Odo Yacht Harbor, Fukuoka City, Japan
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Signs of noctilucent clouds as Simon travelled overnight across the Atlantic Ocean, approaching Dublin, Ireland
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