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Main Cloud Types
- Cumulus
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- Cumulonimbus
Other Clouds
- Arcus
- Asperitas
- Cap / banner clouds
- Capillatus
- Castellanus
- Cataractagenitus
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- Cavum (Fallstreak hole)
- Congestus
- Contrail (homogenitus)
- Duplicatus
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- Fractus
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- Lacunosus
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- Mamma
- Morning Glory Cloud
- Murus (Wall cloud)
- Mediocris
- Nacreous
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- 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
Pileus are small, horizontal clouds that form above cumulus or cumulonimbus clouds, due to rising air that condenses into a smooth shape upon reaching its dew point, and this formation is usually an indicator of severe weather. This classic example was spotted over Bethesda, Maryland, US.
A robust cumulonimbus visually highlighted by the contrast of colour in the sky, spotted over the Picentini Mountains, Italy
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Rainbow over Schlossborn, Taunus, Germany
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The pathway of lightning clearly marked in the evening sky over Arlington, Virginia, US
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Cumulus congestus that appears to be on the verge of developing into a cumulonimbus, with a classic example of pileus over the top of its formation, spotted near Tuggeranong, Australian Capital Territory, Australia
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Altocumulus lenticularis, along with lenticularis that appear to be at the stratocumulus level in the background, spotted near Torres Del Pine, Patagonia, Chile
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Virga coming close to reaching the ground, which if it did, would be precipitation reaching the surface, stemming from a storm at sunset near Bigfork, Montana, US
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An expansive storm system with shreds of pannus, which are also known as scud clouds, forming below the cumulonimbus, as captured by Warren Keelan from the top of Mount Kiera in Wollongong, New South Wales, Australia
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Shreds of pannus, also known as scud clouds, can take on different shapes and sizes, and usually exists within the saturated environment beneath a storm. This example was spotted over Cotia, São Paulo, Brazil
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Volutus (Roll Cloud) associated with a storm system that produced heavy rain, as spotted by Anuja's nephew, Akshay Shankar, over Bangalore, India
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Mamma (Mammatus) clouds following a thunderstorm over Chalfont, Pennsylvania, US
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Shreds of Pannus, often referred to as scud, accompany a storm system over Baraboo, Wisconsin, US.
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Tentacles of pannus, also known as scud, over Bethesda, Maryland, US.
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Tentacles of pannus often referred to as scud, hang from a storm system over Highland Beach, Maryland, US.
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Shreds of Pannus, often referred to as scud, trail from a Cumulonimbus storm system over Florida, US.
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A view of Ashford, Kent, taken from the Wye Downs, UK.
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