This beautiful new cloud – Asperitas – now officially in the International Cloud Atlas


Click to enlargeInternational Cloud Atlas/Kairo Kiitsak

❝ Gavin Pretor-Pinney, the London-based president of the Cloud Appreciation Society, first saw the unusual cloud in 2006. A member of the amateur cloud-spotting group in Cedar Creeks, Iowa emailed a photo of an oddly wavy cloud, and asked how it would be classified…

Its shape was similar to what the World Meteorological Organization would categorize as an undulatus formation, but was “more intense, more chaotic.” The WMO’s International Cloud Atlas, first published in 1896, didn’t include anything like it.

❝ Every six months or so, a similar image would arrive, maybe from Scotland, or Australia. The president and others began to feel that a new label was needed to fit the unfamiliar cloud. In 2008, the amateur cloud-spotting group proposed the name asperitas, Latin for “roughness,” and submitted the idea to the WMO.

Nearly 10 years after they floated the idea, the society’s efforts paid off: the WMO has added the asperitas to the updated International Cloud Atlas, released online earlier this week…

❝ Naming clouds, says Pretor-Pinney, builds a deeper connection to what’s visible in our atmosphere, “which also makes us care more about what we’re doing to it.”

I’ll second that emotion. RTFA for details on cloud-naming in disciplined scientific fashion. An enjoyable read. Lovely photographs.

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