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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
Asperitas over Kester, United States
Nacreous clouds are often lenticular wave clouds which are found downwind of mountain ranges that induce gravity waves in the stratosphere. These nacreous clouds were spotted by Gary's friend, Sierra Salin, in the early morning hours over Mt. Tamalpais, Marin County, California, US.
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An ephemeral glimpse of supercilium, an unofficial classification for a short-lived cloud formation that resembles eyebrow-like features, spotted over the mountains on a cold and windy day in Montevergine, Mercogliano, Italy
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Stratocumulus with color from the sun, spotted over Jiangxi Province, China
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As Robyn was driving, she spotted a cloud face that also spotted her, over the Estrella Foothills, Arizona, US
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Mamma (Mammatus) over Neustadt in Sachsen, Germany
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Lunar corona over Cracow, Poland
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Altocumulus lenticularis, along with lenticularis that appear to be at the stratocumulus level in the background, spotted near Torres Del Pine, Patagonia, Chile
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A colorful display of altocumulus over Beckley, near Oxford, England
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Horseshoe Vortex over Wreck Bay Aboriginal Land, Australia
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A few rows of cumulus clouds that can be seen off into the distance, resembling cloud streets, spotted over Cotia, São Paulo, Brazil
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Iridescence by way of cumulus clouds over Austin, Texas, US
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Crepuscular rays over Khomeyni Shahr, Esfahan, Iran
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A vibrant sunset following an earlier thunderstorm near Brisbane, Australia
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Altocumulus undulatus at sunrise as viewed from west of the Rocky Mountain foothills, looking east, near Fort Collins, Colorado, US
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A classic example of a fallstreak hole (cavum) spotted amidst an expansive display of altocumulus clouds over Lot, Occitanie, France
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Altocumulus over New Taipei City, Taiwan
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Asperitas spotted near Bremen, Germany
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Layers of clouds near Hebburn and Newcastle upon Tyne, England
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Nacreous clouds spotted just before dawn over Oakland, California, US
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Lenticularis over Canyon View Mobile Home Park, United States
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A reflective view of the sunset while at a gas station in Santa Fe, New Mexico, US
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Multiple fallstreak holes (cavum) spotted over Sebastopol, California, US
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A vibrant sunrise over the Atlantic Ocean, near Boca Raton, Florida, US
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Sky Windows 2 © Bob Maysmor
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© Bob Maysmor
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Contrail over Downsview-Roding-CFB, Canada
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Contrails and contrail shadows present themselves in this unique atmospheric optical phenomena, wherein the shadows are created when the sun (or moon) casts a shadow of an aircraft contrail onto a lower layer of clouds or haze. The interplay of light, clouds, and ice crystals, coupled with one's viewing angle, gives rise to a captivating display in the sky, as seen here during sunset over Falls Church, Virginia, US.
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Cirrus spissatus over Island Bay, Wellington, New Zealand
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Moon dog, analogous to a sun dog (parhelion), but with the light from the moon that is interacting with ice crystals in the atmosphere, spotted here over The Villages, Florida, US
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A "big bird" is spotted overhead in the midst of the cirrus clouds over Goodyear, Arizona, US
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A unique view of what might be interpreted as a solar corona, reflected through particles in the atmosphere, spotted at sunset near Saint-Jean-des-Vignes, France
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Altocumulus undulatus radiatus, viewed while facing north in the early morning hours, near Charlo, Montana, US
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A blue landscape wherein the water appears to meet the sky, near Taitung, Taiwan
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Altocumulus lenticularis spotted over the Sierra Nevada mountains, as viewed from Granada, Spain
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Altocumulus and cumulus fractus spotted over Sanxia District, New Taipei City, Taiwan
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Iridescence over Lochbuie, United States
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Sunset reflecting the contrast between the sky and the trees, as seen over Melksham, Wiltshire, England
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A storm system approaching a set of windmills near the Gaomei Wetlands, Taichung, Taiwan
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Nacreous clouds are often lenticular wave clouds which are found downwind of mountain ranges that induce gravity waves in the stratosphere. These nacreous clouds were spotted by Gary's friend, Sierra Salin, in the early morning hours over Mt. Tamalpais, Marin County, California, US.
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An ephemeral glimpse of supercilium, an unofficial classification for a short-lived cloud formation that resembles eyebrow-like features, spotted over the mountains on a cold and windy day in Montevergine, Mercogliano, Italy
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Stratocumulus with color from the sun, spotted over Jiangxi Province, China
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As Robyn was driving, she spotted a cloud face that also spotted her, over the Estrella Foothills, Arizona, US
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Mamma (Mammatus) over Neustadt in Sachsen, Germany
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Lunar corona over Cracow, Poland
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Altocumulus lenticularis, along with lenticularis that appear to be at the stratocumulus level in the background, spotted near Torres Del Pine, Patagonia, Chile
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A colorful display of altocumulus over Beckley, near Oxford, England
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Horseshoe Vortex over Wreck Bay Aboriginal Land, Australia
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A few rows of cumulus clouds that can be seen off into the distance, resembling cloud streets, spotted over Cotia, São Paulo, Brazil
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Iridescence by way of cumulus clouds over Austin, Texas, US
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Crepuscular rays over Khomeyni Shahr, Esfahan, Iran
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A vibrant sunset following an earlier thunderstorm near Brisbane, Australia
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Altocumulus undulatus at sunrise as viewed from west of the Rocky Mountain foothills, looking east, near Fort Collins, Colorado, US
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A classic example of a fallstreak hole (cavum) spotted amidst an expansive display of altocumulus clouds over Lot, Occitanie, France
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