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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 cloud formation that resembles a DNA double helix is likely a Kelvin-Helmholtz (Fluctus) cloud or a double helix cloud. These formations are not a specific type of cloud, per se, but rather a visual phenomenon resulting from the interaction of air layers moving at different speeds and densities. This results in air flows that tend to have a distinct serpentine motion. This rare sighting was spotted over Auckland, New Zealand.
An approaching storm over the Forest of Dean, Yorkley, England
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Sunrise over the Sangre de Cristo mountains north of Santa Fe, New Mexico, US
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Storm development with various shades of grey, accompanied by signs of mammatus (mamma), spotted over Arnhem, Netherlands
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Crepuscular rays making their way through storm clouds during sunset over Sumirago, Varese, Italy
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Cumulus humilis and fractus over Monthault, Ille et Vilaine, France
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On a hot day, evaporation fog emanates over the Northwest Arm of Halifax Harbour, Halifax, Nova Scotia, Canada
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Sunset over Rangeley Lake, Franklin County, Maine, US
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Iridescence and subtle signs of lacunosus spotted over Winchester, England
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A primary and secondary bow spotted by Rafael's friend, Cindy Tang, over Changchun, China
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A developing thunderstorm at sunset, upon which Edward saw a frightening monster standing, with eyes and a nose, powerful arms and fists, and a belt, spotted over Vermontville, Adirondacks, New York, US
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A variety of lenticularis cloud formations in the vicinity of Mount Adams, near Hood River, Oregon, US
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As Rachel observed, the clouds resembled two winged creatures making away with the moon, as seen over North Dundas Township, Ontario, Canada
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Fog which covered the hillside in the morning had started floating upward, looking like soft cotton candy, spotted over Santa Rosa, California, US
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Cirrus vertebratus spotted over Roanoke, Virginia, US
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A robust cumulonimbus visually highlighted by the contrast of colour in the sky, spotted over the Picentini Mountains, Italy
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