Abstract
It has long been recognised that clouds of ice particles have a characteristically fibrous appearance very different from that of droplet clouds, which look “solid” and have more sharply defined edges, even when dissipating. Small, isolated trails of snow or soft hail, known as Fallstreifen (fall-streaks) or virga, which fall from medium-level clouds, also possess this fibrous structure, and when they become separated from their parent clouds and are seen in a favourable light exactly resemble forms of true cirrus. A fibrous structure on a coarser scale can also be seen in rain beneath shower clouds.
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© 1951 American Meteorological Society
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Ludlam, F.H. (1951). The Physics of Ice Clouds and Mixed Clouds. In: Malone, T.F. (eds) Compendium of Meteorology. American Meteorological Society, Boston, MA. https://doi.org/10.1007/978-1-940033-70-9_16
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DOI: https://doi.org/10.1007/978-1-940033-70-9_16
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