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Other Clouds
- Arcus
- Asperitas
- Cap / banner clouds
- Capillatus
- Castellanus
- Cataractagenitus
- Cauda (Tail cloud)
- Cavum (Fallstreak hole)
- Congestus
- Contrail (homogenitus)
- Duplicatus
- Diamond dust
- Distrail
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- Flammagenitus (Pyrocumulus)
- Floccus
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- Fractus
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- Humilis
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- 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
Lacunosus, a rare, short-lived formation, is identified in terms of the gaps between cloud elements, rather than the clouds themselves. It is when a cloud layer is composed of more or less regular holes, around which fringes of cloud form, like a net or rough honeycomb. The holes of this variety are formed by sinking pockets of air, and the cloud fringes around them by air rising up between the pockets to replace them. Such sinking can occur when a layer of cooler air finds itself over a warmer one. Being more dense, the cooler air sinks down through the warmer air. This classic example was spotted on a cold morning over Priddy, Somerset, England.
A wispy cloud in the foreground, with a storm system on the horizon, spotted over Great Island, Cobh, Ireland
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An imposing storm system viewed with the lighting effect from the sun, spotted over Greenville, South Carolina, US
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Remnants of a Fallstreak Hole (Cavum) spotted by Peter's friend, Valerie, over Bentworth, England
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Sunset along the River Itchen in Southampton, Hampshire, England
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Sun Dog (Parhelion) spotted over Larestan, Iran
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Altocumulus perlucidus spotted over Taiwan
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A colourful view of cloud streets, which are long, parallel rows of cumulus clouds formed by horizontal convective rolls in the atmosphere, spotted from Moana Beach, looking towards Rapid Head, South Australia, Australia
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A developing storm near Lisboa, Portugal
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Signs of an elongated Altocumulus lenticularis spotted over Hamanomachi Park, Fukuoka City, Japan
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Signs of pileus spotted over Niepołomice, Poland
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Crepuscular rays spotted from Boca Raton, Florida, US
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Undulatus spotted prior to the arrival of a storm near Ormskirk, Lancashire, England
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Remnants of what appears to be an intersecting contrail, spotted over Longmont, Colorado, US
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Stratocumulus lenticularis, an uncommon version of a lenticular cloud, spotted over Twisp, Washington, US
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A snowy landscape beneath a setting sun over North Dundas Township, Ontario, Canada
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