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Updating the World Meteorological Organization International Cloud Atlas
12 June 2015

The World Meteorological Organization is advancing with a major project to revise and update the International Cloud Atlas. The aim is to produce a user-friendly, digital-based product which is an authoritative, comprehensive and up-to-date source of reference and is also interesting and accessible to a wide audience.

It is proposed to introduce the definition of a new supplementary feature, "asperitas", defined as "A formation made up of well-defined, wavelike structures in the underside of the cloud, more chaotic and with less horizontal organization than undulatus. It is characterised by localized waves in the cloud base, either smooth or dappled with smaller features, sometimes descending into sharp points, as if viewing a roughened sea surface from below. Varying levels of illumination and thickness of cloud can lead to dramatic visual effects."

An example is shown below taken recently in Tralee, Co Kerry by Anthony Dawson. Further information is available from the WMO website here

 
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