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Main Cloud Types
- Cumulus
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- Altostratus
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- Cirrocumulus
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- 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
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- Morning Glory Cloud
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- Mediocris
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- Noctilucent
- Pannus
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- Pileus
- Praecipitatio
- Radiatus
- Silvagenitus
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- 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
Crepuscular rays over Madison, Wisconsin, US
A storm system over the Rhine River, near Cologne, Germany
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A developing storm over the Olympic Peninsula and Puget Sound, viewed from Discovery Park, Seattle, Washington, US
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Subtle signs of lacunosus spotted over East Tisted, England
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Altocumulus over Khomeynishahr City, Esfahan, Iran
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Mammatus (Mamma) at sunset near Sacramento, California, US
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A dissipating cumulonimbus spotted during a summer road trip after leaving Mount Shasta, near Yreka, California, US
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Virga spotted during the early morning over Goodyear, Arizona, US
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On a flight from Charlotte, North Carolina, to Phoenix, Arizona, Peter conveyed that it was dodging storms along its route, with this view captured over Lebanon, Virginia, US
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A variety of clouds populating the sky over Jigyohama, Fukuoka City, Japan
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A notable storm system with defined mammatus (mamma) spotted near Brighton, Colorado, US
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Cumulus congestus alongside a sliver of the moon, spotted over Noosa, Sunshine Coast, Australia
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Given the visual perspective of the cumulus clouds, it seemed as if they were zooming quickly towards Helen when she spotted them over Somerset, England
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A contrail traversing the sky over Kraków, Poland
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An afternoon downpour near Charlo, Montana, US
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In sharply defined rainbows, a set of narrow coloured bands can often be found repeating on the inside of the primary bow. Called supernumerary bows, they add an extra-special dimension to the display and are produced by diffraction as light waves cross each other exiting the raindrops, as seen here over Amsterdam, Netherlands.
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