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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.
Full moon beyond the cirrus clouds, spotted over Arnhem, Netherlands
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Altocumulus undulatus over Crank, Merseyside, England
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A colorful sunrise over Birmingham, England
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Cirrocumulus cloud formation that appears to have originated from a contrail, spotted near Walnut Creek, California, US
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A colorful sunset over El Dorado Hills, California, 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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Remnants of a contrail against the clear sky of daylight, versus what could have initially been perceived to be noctilucent, yet the latter is seen within the night sky (Latin for "night-shining"). This view of the sky was spotted over Beijing, China.
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A contrail partly hidden by lower level cumulus fractus over Soledad, California, US
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Remnants of a contrail on a blue sky day over Huntington, Indiana, US
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A contrail and its associated homogenitus captured by Jim's neighbor, Marjorie Westermann. As Jim shares, their "remote mountain neighborhood found this cloud a 'feather in our caps' rewarding us for living and relishing high altitude life." This scene was photographed near the Tennessee Pass, at an elevation of 10,425 feet in the Sawatch Mountain Range, Colorado, US.
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Crepuscular rays and shadows at sunset near Charlo, Montana, US
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Contrails and contrail shadows present themselves in this unique atmospheric optical phenomena, wherein the shadows are created when the sun (or moon) casts a shadow of an aircraft contrail onto a lower layer of clouds or haze. The interplay of light, clouds, and ice crystals, coupled with one's viewing angle, gives rise to a captivating display in the sky, as seen here during sunset over Falls Church, Virginia, US.
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Undulatus over National Taipei University, New Taipei City, Taiwan
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"Sunset Inferno, South Jersey", as titled by Joseph's daughter, who spotted this near Cherry Hill, New Jersey, US
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