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Main Cloud Types
- Cumulus
- Stratus
- 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
A vivid corona is spotted when the sun shines through a thin cloud and a bluish-white disc of light with a ruddy outer edge is on display, often surrounded by rings of iridescent colours. This classic example was seen by Cassie Eismann near Fort Scott, Kansas, US.
Cirrocumulus undulatus spotted over Mavora Lakes, Southland, New Zealand
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Cirrocumulus over Falls Church, Virginia, US
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An early evening view of what appears to be altocumulus undulatus spotted while looking south over Manhattan, New York, US
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A snowy landscape that is matched in the sky over Pittsburgh, Pennsylvania, US
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Altocumulus undulatus, to which Mary said "I can almost hear fingernails screeching on a blackboard from these fingers", as seen near Castle Valley, Utah, US
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Altocumulus undulatus over Twisp, Washington, US
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Altocumulus that looked to Marianne as if she was looking into the ocean instead of the sky, with the way whales and sharks have lots of small fish around them, cleaning them by eating away parasites. This was the view of the sky near Ronda, Andalusia, Spain.
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Altocumulus stratiformis undulatus, also known as a "mackerel sky", is on display above lower level cumulus fractus, over Boca Raton, Florida, US
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Altocumulus stratiformis radiatus over Aix-en-Provence, France
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An expansive display of altocumulus over Esfahan, Iran
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A unique juxtaposition of a sun dog (parhelion) and a fallstreak hole (cavum) spotted over Frankfurt, Germany
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A picturesque sunrise over Wenatchee, Washington, US
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Altocumulus undulatus with lacunosus spotted shortly before sunset over Johannisberg, Rhine Valley, Germany
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Reflections of altocumulus following a rain event near Brickyard Cove, Berkeley, California, US
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Altocumulus undulatus over Crank, Merseyside, England
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