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Asperitas (formerly known as Undulatus asperatus) is a cloud formation first popularized and proposed as a type of cloud in 2009 by Gavin Pretor-Pinney of the Cloud Appreciation Society. Added to the International Cloud Atlas as a supplementary feature in March 2017, it is the first cloud formation added since cirrus intortus in 1951. [ 2 ]
"Radial". Clouds in one of several possible forms arranged in parallel lines that appear to converge at a central point near the horizon. Undulatus "Wavy". Stratiform or stratocumuliform cloud displaying an undulating pattern. Vertebratus "In the form of a back-bone". Cirriform arranged to look like the back-bone of a vertebrate.
The wavy strips of clouds are generally near an inversion surface. Also referred to as billow clouds , wind row clouds , or wave clouds , variations of the undulatus can be elements that have merged or single elements that have stretched through the sky.
The aurora borealis put on quite the show over the United States multiple times in 2024, and 2025 promises even more opportunities to witness these celestial light displays.
The altocumulus undulatus is a mid-level cloud (about 8,000–20,000 ft or 2,400–6,100 m), usually white or grey with layers or patches containing undulations that resemble "waves" or "ripples" in water.
A mackerel sky is a term for clouds made up of rows of cirrocumulus or altocumulus clouds displaying an undulating, rippling pattern similar in appearance to fish scales; [1] [2] this is caused by high altitude atmospheric waves. [3]
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