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Cirrus over Alto, United States
Circumzenithal Arc spotted over Lakewood Ranch, Florida, US
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Cirrus spissatus spotted during the early morning hours over Marina Town, Fukuoka City, Japan
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Cirrus over Temecula, California, US
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Similar to other clouds, contrails can cast shadows, in that an aircraft and its contrail are actually high up in the sky, while the shadow is cast downwards onto the cirrus haze layer by the sun or the moon. The thin layer acts as a canvas upon which the shadow is projected. In the end, contrail shadows are a captivating atmospheric optical phenomena that sometimes appears counter-intuitive. This example of such a contrail and its shadow was spotted over Columbus, Ohio, US.
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Sun Dog (Parhelion) spotted over Ormskirk, Lancashire, England
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A view from above the clouds, wherein Kathy shared that she thought of the song "Spirit In The Sky" upon seeing these cirrus clouds on a flight between Charlotte, North Carolina and Tallahassee, Florida, US.
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Altocumulus lenticularis duplicates with cumulus fractus in the foreground, spotted over Patagonia, Argentina
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Cirrus homogenitus as a result of aircraft condensation trails, also known as contrails, in the upper atmosphere. When these types of clouds persist and evolve towards a more natural appearance, its cloud classification changes from homogenitus to homomutatus. This example was spotted over Abergavenny, Wales.
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On a flight from Dubai to Johannesburg, Jim had a unique view from above the clouds, viewing the storms developing over Zanzibar on Unguja Island, Tanzania
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Full moon beyond the cirrus clouds, spotted over Arnhem, Netherlands
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Cirrus uncinus on grand display near San Luis Obispo, California, US
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A colorful sunset over El Dorado Hills, California, US
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A view of the sunrise over the Atlantic Ocean, near Boca Raton, Florida, US
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Remnants of contrails that form into high level cirrus clouds via homogenitus, which is when clouds develop as a result of human activity such as from aircraft condensation trails; i.e., contrails. In this instance, it has taken on the look of "feathers" in this view near El Dorado Hills, California, US.
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A variety of cirrus clouds over Oakland, California, US
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