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Optical Effects
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A unique juxtaposition of a sun dog (parhelion) and a fallstreak hole (cavum) spotted over Frankfurt, Germany
Fallstreak hole, also known as a cavum, spotted shortly after sunrise near Plaquemine, Louisiana, US
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Fallstreak Hole (Cavum) with a "tail" that Nigel said extended beyond what was captured in this photograph by approximately three times the length seen here, spotted over Newton upon Rawcliffe, Yorkshire, England.
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A classic example of a fallstreak hole (cavum) spotted amidst an expansive display of altocumulus clouds over Lot, Occitanie, France
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Multiple fallstreak holes (cavum) spotted over Sebastopol, California, US
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Cavum (Fallstreak Hole) spotted over Lynchburg, Virginia, US
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Fallstreak Hole (Cavum) over Catforth, Preston, England
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Cavum (Fallstreak Hole) over North Brunswick, New Jersey, US
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Cavum (Fallstreak Hole) spotted over Fort St. John, British Columbia, Canada
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A unique combination of a sun dog within an elongated cavum (fallstreak hole), spotted over London, Ontario, Canada
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A spectacular fallstreak hole (cavum) spotted near Seattle, over Snohomish, Washington, US
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Multiple fallstreak holes (cavum) joined together over Charlotte, Michigan, US
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Cirrocumulus with signs of a possible cavum (fallstreak hole), spotted over Kingston, Tasmania, Australia
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A classic fallstreak hole (cavum) over Charlotte, Michigan, US
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A unique juxtaposition of what appears to be a Cavum (Fallstreak Hole), along with a Circumhorizon Arc, spotted over Cape Coral, Florida, US
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Cavum (Fallstreak Hole), which is formed when part of the cloud layer forms ice crystals which are large enough to descend as a "fallstreak". They form in clouds of supercooled water droplets, which in the end, creates a form of virga, a trail of ice crystals that doesn’t reach the ground, but evaporates before getting that far. This classic example was spotted over Charlotte, Michigan, US.
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