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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
Altocumulus radiatus indicates instability at mid-atmospheric levels and often signaling approaching stormy weather. This was true in this case as Bernhard indicated that it rained only two hours later, near the English Garden, Munich, Germany.
A rainbow spotted over Budd Bay, Olympia, Washington, US
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A developing storm system near Place de la Concorde, Paris, France
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Remnants of a contrail spotted over Davidson Mill Pond Park, New Jersey, US
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Crepuscular rays spotted along with virga, near Charlo, Montana, US
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Late afternoon snow squalls in the mountains near Vermontville, Adirondacks, New York, US
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Signs of a corona and undulatus in this view from the Austrian Alps, on a day that Tobias said brought strong North Föhn winds, which is a warm, dry and gusty downslope wind when the air moves from north to south. This high altitude perspective was spotted over St. Anton am Arlberg, Austria.
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Altocumulus undulatus spotted over New Taipei City, Taiwan
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A range of cumulus clouds reflective with the sunlight over Kaohsiung, Taiwan
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Cirrus uncinus spotted over Montrose, California, US
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Cirrocumulus with signs of lacunosus, spotted over Rufford, West Lancashire, England
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Altocumulus lenticularis spotted overhead during a salmon fishing expedition in Argentina
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Crepuscular rays and shadows, accompanied by a cloud that resembles a raven, spotted over North Dundas Township, Ontario, Canada
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Cumulus clouds with the lower one taking on the look of a scorpion, spotted over Vancouver, Washington, US
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Altocumulus perlucidus spotted by Anuja's son, Aarant Sarangi, over Shaheed Dweep (Neil Island), Andaman and Nicobar Islands, India
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A vivid and colourful sky at sunset near Conwy, looking towards Ynys Mon, Wales
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