A remarkable early autumn sky

Started Sep 26, 2012 | Discussions thread
Craig Philips
Regular MemberPosts: 220
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Mammatus vs Asperatus clouds + thanks Elias, Mike & Russell
In reply to docmaas, Oct 2, 2012

Elias' post referencing the Cloud Appreciation Society led me to their site and more information about the group's ambitious effort to get the first new cloud type officially recognized since 1951: undulatus asperatus (agitated wave--asperatus derives from the latin verb aspero "to make rough"). Until now this type of cloud has been lumped together with mammatus clouds ("mammary or breast clouds"). That name's appropriateness is evident in the image on the left (taken in Wyoming); the clouds on the right (over Malaga, Spain) are obviousy very different and remarkably similar to the one's I photographed on the 25th (crop from a second photo added below). The link Russell provided yields a remarkable Norwegian landscape capped by Asperatus clouds. The site includes an interesting and very extensive gallery of cloud types--and invites submission of cloud photographs.

Michigan, Sept 25:

The Society is currently attempting to persuade the (fusty?) World Meteorological Organization (Genève) to include Asperatus clouds as an officially recognized type in the International Cloud Atlas (last published in 1975).

Mike, please thank your professor friend for his enlightening explanation of this engaging phenomenon. Perhaps you can persuade him to share it with the Society and the Reading University [UK] grad student now studying Asperatus clouds (Russell's link). That might be all that's needed to push the Society's project over the top and make 2012 a banner year in meteorology!

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