This news item is a couple of weeks old so apologies if you have seen it, but in case you haven't:http://science.sciencemag.org/content/355/6332/1354.full
A new cloud atlas, now with contrails
Contrails, or aircraft condensation trails, are now included in WMO's cloud atlas.
Stunning images of cloud formations dot the World Meteorological Organization's latest incarnation of its International Cloud Atlas, released online last week. The first update to the atlas (https://www.wmocloudatlas.org/home.html
) in decades includes one new cloud species—“volutus,” a long, tube-shaped cloud that appears to roll across the horizon—as well as human-mediated clouds such as contrails, the vapor trails sometimes produced by airplanes. The atlas also describes several new “supplementary features”—cloud formations attached to a main cloud. One such feature is “cavum,” which resembles a hole punched through a broad, thin layer of cloud. Another is “fluctus,” also known as a Kelvin-Helmholtz cloud, which is shaped much like the geometric waves on a Minoan vase. And then there's “asperitas” (Latin for “roughness”); this dramatically bumpy cloud is a favorite of the Cloud Appreciation Society, founded in 2005 by London author and cloud enthusiast Gavin Pretor-Pinney. The society has lobbied for the inclusion of asperitas in the official atlas for nearly a decade—and finally got their wish.
The Guardian also a good article on this as well:https://www.theguardian.com/science/gall...las-in-pictures
Dose anyone know if the BOM has an updated version of their volume: "Observing the weather"?