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Other Clouds
- Arcus
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- 'Supercilium' (not official classification)
- Translucidus
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- Uncinus
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- Virga
- Volutus (Roll cloud)
Optical Effects
- 22° Halo
- 46° Halo
- Circumhorizon Arc
- Circumscribed halo
- Circumzenithal Arc
- Cloudbow / Fogbow
- Corona
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- Infralateral arc
- Iridescence
- Lower Sun Pillar
- Lower Tangent Arc
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- Parry antisolar arcs
- Parry arc
- Parry infralateral arc
- Parry supralateral arc
- Rainbow
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- Sub-sun
- Suncave parry arc
- Sun dog (Parhelion)
- Sun pillar
- Supernumerary bows
- Subparhelic circle
- Supralateral arc
- Upper tangent arc
- Wegener arc
A robust, developing storm system spotted over Turks and Caicos Islands
Cumulonimbus with an arcus outlining the leading edge of the storm, accompanied by pannus, spotted by John's friend, Will Werner, in Brazil
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An arcus ushering in a storm, spotted looking east over the Tasman Sea, near Balgowlah Heights, New South Wales, Australia
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A leading edge of a storm system near Antwerp, Belgium
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Following a humid day, a notable storm developed over the Tasman Sea, near Manly, New South Wales, Australia
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Signs of what appears to be a variation of an approaching arcus, ushering in inclement weather, spotted near Aberdyfi, Wales
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An arcus, also known as a shelf cloud, indicating a leading edge of a storm system, spotted near Malebelling, Western Australia, Australia
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Signs of lacunosus on the underside of the leading edge of a cumulonimbus, spotted over Erm, The Netherlands
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Signs of a dissipating arcus associated with a diminishing storm system near Bremen, Germany
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A storm system moving northeast near Manchester, Connecticut, US
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An arcus ushering in a storm system over Somerset, England
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A roll cloud, or volutus, which is a rare, low horizontal tube-shaped arcus cloud, detached from the parent storm cloud, and represents the leading edge of a thunderstorm's gust front. This example was spotted between Vinylhaven Island and the Rockland area of the Mid-Coast, near Penobscot Bay, Maine, 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 storm system near Savannah, Georgia, US
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An approaching storm system near Brighton, Colorado, US
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A developing and expansive storm approaching Marina di Pisciotta, Italy
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