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Altocumulus lenticularis duplicatus spotted near Capdenac, Lot, France
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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Full moon beyond the cirrus clouds, spotted over Arnhem, Netherlands
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Sunrise upon which Paul noticed the look of a snail meandering across the sky, spotted over Brighton and Hove, England
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Altocumulus undulatus over Crank, Merseyside, England
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Cirrus uncinus on grand display near San Luis Obispo, California, US
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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 subtle sun pillar at sunset over Krakow, Poland
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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 lower level altocumulus lenticularis came to rest at sunset over what Patricia conveyed was a cemetery on a hill across the river from the city. This cemetery remains on the hill, with its origin stemming from the Jewish community that was expelled from the city in 1492, in Segovia, Spain.
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