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Main Cloud Types
- Cumulus
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- Stratocumulus
- Altocumulus
- Altostratus
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- Cirrocumulus
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- 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
Mamma (Mammatus) tend to form on the underside of an incus associated with a cumulonimbus storm cloud. However, mamma cloud formations can occur on a range of cloud types, albeit usually following the passage of a storm. This example was spotted near Boca Raton, Florida, US.
Asperitas spotted over Northern Illinois, US
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Amidst the clouds, Robyn spotted a tiny eye looking down with an eyebrow raised, over Estrella Foothills, Arizona, US
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Sunset over Chicago, Illinois, US
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A subtle display of anti-crepuscular rays spotted in the opposite direction of the sunset over North Dundas Township, Ontario, Canada
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Sunset over Manhattan, viewed from Domino Park, Brooklyn, New York, US
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A storm system spotted over Curtin, Canberra, Australia
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Altocumulus spotted shortly before sunrise over Madison, Wisconsin, US
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An eye-catching evening storm near Ronan, Montana, US
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A storm system associated with a cold front spotted over Southern Alberta, Canada
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A picturesque sunset over Meinohama Fishing Port, Fukuoka City, Japan
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The setting sun illuminating a storm overhead, spotted near Throsby, Canberra, Australia
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A sky that takes on a notable resemblance to the pattern of snow on the ice below, spotted over South Cove, Lunenburg County, Nova Scotia, Canada
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Stratus over Curtin, Canberra, Australia
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A storm system making its presence known over São Paulo City, Brazil
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Crepuscular rays spotted from Holme Beach, Norfolk, England
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