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Main Cloud Types
- Cumulus
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- 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
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- Intortus
- Lacunosus
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- Morning Glory Cloud
- Murus (Wall cloud)
- Mediocris
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- Noctilucent
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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
22-degree halo is seen as the sunlight is refracted through the ice crystals of thin layers of high clouds, such as cirrostratus in this case. Note how it 'ceases to exist' where there are no thin layers of clouds present. This example was spotted over Lake Stevens, Washington, US.
22-degree halo, which appears as sunlight is refracted through the ice crystals of thin layers of high clouds, such as Cirrostratus in this photograph. An added feature in this particular scenario is the reflection of the 22-degree halo in the layer of water on a beach on the Isle of Lewis and Harris, Scotland.
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22-degree halo over Rome, Italy
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The intersection of nature and technology, with a 22-degree halo over Mauritius, East Africa
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22-degree halo over Barbados, West Indies.
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A lunar halo over the Sierra de las Nieves national Park in Tolox, Andalucia. Spain.
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A lunar halo over Sumirago, Varese, Italy.
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A 22° lunar halo over Melbourne, Australia.
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A halo over Swift Current in Saskatchewan, Canada.
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A lunar halo over Bozeman, US.
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A halo over Winthrop, Washington, US.
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A halo over Mercogliano, Italy.
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A halo over Cajeme, Sonora, Mexico.
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A halo over West Sussex, England.
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A solar halo over Yebes, Spain.
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A halo over Selsey Bill, West Sussex, England.
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