They’re rare, short-lived, and when you see an especially prominent fluctus formation, they can be spectacular. Pronunciation edit ( Classical) IPA ( key): /fluk. Latin edit Etymology edit From flu (flow) + -tus (action noun-forming suffix). (earlier (late Middle English) as fluctuation): from Latin fluctuat- undulated, from the verb fluctuare, from fluctus flow, current. The fluctus cloud feature is a definite cloudspotting favorite. English edit Noun edit fluctus ( plural fluctus or flucti ) ( astronomy, geology) An area covered by outflow from a volcano.
It can happen as wind blowing over water, or even in the atmosphere of other planets. It’s thought that Van Gogh’s Starry Night oil on canvas was inspired by Kelvin-Helmholtz wave clouds. This phenomena can happen deep in the ocean or in clear air. Kelvin Helmholtz instability isn’t only found in clouds. This causes instability in the cloud with the end result forming a cloud that resembles a crashing wave. Named after physicists Lord Kelvin and Hermann von Helmholtz, Kelvin-Helmholtz instability in clouds is caused by speed shear, which means the wind is moving at a different speed in the upper layer of a cloud than it is in the lower layer. Fluctus cloud formations are easily identified through their distinctive curled, crashing wave appearance. Find fluctus (Noun) in the Latin Online Dictionary with English meanings, all fabulous forms & inflections and a conjugation table: fluctus, fluctus. Mid 17th century (earlier (late Middle English) as fluctuation): from Latin fluctuat- undulated, from the verb fluctuare, from fluctus flow, current. Translated from latin, meaning wave, the five types of fluctus clouds are respectively abbreviated as ‘Ci flu’, ‘Ac flu’, ‘Cu flu’, ‘St flu’, and ‘Sc flu’. Popularly known as Kelvin-Helmholtz instability or KH wave clouds, the ‘fluctus’ cloud feature can be found amongst five cloud types: cirrus, altocumulus, cumulus, stratus, and stratocumulus.
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