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Main Cloud Types
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Other Clouds
- Arcus
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- Cataractagenitus
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- Morning Glory Cloud
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- 'Supercilium' (not official classification)
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- Tuba / Twister
- Uncinus
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- 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
A grand display of virga, following a day that Martha described as being filled with cirrus uncinus, spotted over Asheville, North Carolina, US
Cumulus congestus, potentially developing into a cumulonimbus, captured by Nicola's son, Sam, near Adelaide, South Australia
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Fallstreak Hole (Cavum) over Catforth, Preston, England
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Sun Dog (Parhelion) and reflections in the water near Salerno, Italy
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Asperitas over Winnipeg, Manitoba, Canada
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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.
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Cirrus spissatus, which is a thick cirrus cloud, is often accompanied by other species of cirrus clouds within close proximation. These clouds can be formed by a conglomerate of cirrus clouds at high altitudes, and separate from that origin, they can also form from the remnants of a dissipating thunderstorm that once had a fibrous top. This example of cirrus spissatus was spotted over Thumrait, Southern Oman, near the Yemeni border.
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Shreds of pannus, also known as scud clouds, can take on different shapes and sizes, and usually exists within the saturated environment beneath a storm. This example was spotted over Cotia, São Paulo, Brazil
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Crepuscular rays over New Taipei City, Taiwan
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Cirrus uncinus over Charlotte, Michigan, US
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Fluctus (Kelvin-Helmholtz) is a short-lived phenomenon that occurs when there is a strong vertical wind shear between two air streams, causing winds to blow faster at the upper level than at the lower levels. This example was spotted over Teddington, London, England.
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Mamma (Mammatus) over Mercogliano, Italy
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On a windy and exhilarating hike, Heather witnessed the development of this cap cloud, which forms as a stable airstream rises to pass over a peak, cooling as it does so. It is a particular variation of a lenticularis cloud, in which the cloud lies over the mountaintop, rather than downwind from it. This classic example was spotted from the Mount Fremont lookout at Mt. Rainier National Park, Seattle, Washington, US.
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Brocken Spectre, a unique and rare form of a Glory, capped off an overall spectacular evening of cloud spotting for Allison, as this optical phenomena showcases the delicate interplay between light, mist, and atmospheric particles. This classic example was spotted from a high cliff along the Oregon Coast, near Lincoln City, Oregon, US.
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Cumulus over Minneapolis, Minnesota, US
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An expansive display of altocumulus stratiformis undulatus over Portimao, Algarve, Portugal
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