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Main Cloud Types
- Cumulus
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Other Clouds
- Arcus
- Asperitas
- Cap / banner clouds
- Capillatus
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- Cataractagenitus
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- Cavum (Fallstreak hole)
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- Morning Glory Cloud
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- '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
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- 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
Circumhorizon Arc, which is an optical effect that is caused by ice crystals in the sky acting as tiny prisms that refract and reflect the light, and it appears as a bright, flat band of colours parallel to the horizon. When cirrus clouds are present, they act as a canvas for the circumhorizon arc, causing it to become fragmented. This classic example was spotted over Rosenheim, Germany.
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Circumhorizon Arc over Portola Valley, California, US
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A circumhorizon arc over the Cascades, Washington, US.
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A circumhorizon arc over Akaroa, New Zealand.
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A circumhorizon arc over Pendleton County, West Virginia, US.
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A circumhorizon Arc over Marin County, California, US.
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A circumhorizon arc over the Sierra Nevada mountains of California, US.
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A Flying Fox, aka a circumhorizon arc over Port Williams, Nova Scotia, Canada.
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A circumhorizon arc over the El Dorado Hills, California, US.
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A circumhorizon arc over Watertown, Massachusetts, US.
2 thoughts on “A circumhorizon arc over Watertown, Massachusetts, US.”
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A circumhorizon arc/summertime halo over Curtin, Canberra, Australia.
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A circumhorizon arc, also known as a Summertime Halo, over Snohomish, Washington, US.
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A summertime Halo, circumhorizon arc over Boston Common, US.
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A Circumhorizon arc over Albuquerque, New Mexico.
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A Circumhorizon arc, aka Summertime Halo over Southern California, US.
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A Summertime halo/circumhorizon arc, over Zermat, Switzerland.
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Really nice, Lynn! Looks like a rainbow jellyfish. From Rebecca Hill, Canberra, Australia
This is just gorgeous and resembles a ballet dancer in the Waltz of the Flowers. The tree in the lower right hand corner adds more glamor to the cloud.