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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 vibrant display of Cirrus unicnus, which in Latin means "curly hooks". This type of high-level cloud is also known as mares' tails, as spotted here over South Portland, Maine, US.
A peaceful view from Golden Gardens Beach, Seattle, Washington, US
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A mixed sky over North Dundas Township, Ontario, Canada
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Fog on an early August morning near Charlo, Montana, US
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A giant 'bird' cloud spotted over Marinoa City, Fukuoka City, Japan
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A cumulus cloud that resembles a mushroom, spotted over Avondale, Arizona, US
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A well-defined arcus marks the leading edge of this storm system, which is accompanied by asperitas and signs of lacunosus, near Fort Wayne, Indiana, US
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A multi-faceted storm system spotted near Archer, Florida, US
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An evening sky over the old-town of Wroclaw, Poland
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Crepuscular rays over Hyderabad, India
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Altocumulus floccus over Twisp, Washington, US
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Remnants of what appears to be a contrail over Karema, New Zealand
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Virga spotted while on the road near Montbonnot, Isère, France
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Mammatus (Mamma) at sunset over Hyderabad, India
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Cirrostratus over a layer of altocumulus, spotted shortly after sunset over the Jemez Mountains in Los Alamos, New Mexico, US
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A storm system spotted from the High Ridge Trail at Rock Bridge State Park, near Columbia, Missouri, US
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