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Virga, along with unrelated signs of fluctus, amidst a colourful sky over Birmingham, England
Fluctus (Kelvin-Helmholtz), upon which Conrad described the experience of spotting them as being deeply in awe and grateful for this uplifting vision, during a morning hike in the Canton of Aargau Jura mountains, above Bürensteig, near Brugg, Switzerland.
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Crepuscular rays with early signs of fluctus (Kelvin-Helmholtz), spotted over St-Amandsberg, Belgium
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Fluctus (Kelvin-Helmholtz) spotted from Gaw Hill, Ormskirk, looking inland towards the Lancashire/Yorkshire border, England
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What looks to be a 'new mountain range' appears to actually be a layer of stratus that is exhibiting Holmboe instability. This is an instability related to Kelvin-Helmholtz instability, and it manifests as bumps in the clouds rather than clouds that curl over. This unique example was spotted by Peggy while out on Lake Superior, near Cornucopia, Wisconsin, US.
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A cloud formation that resembles a DNA double helix is likely a Kelvin-Helmholtz (Fluctus) cloud or a double helix cloud. These formations are not a specific type of cloud, per se, but rather a visual phenomenon resulting from the interaction of air layers moving at different speeds and densities. This results in air flows that tend to have a distinct serpentine motion. This rare sighting was spotted over Auckland, New Zealand.
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Fluctus (Kelvin-Helmholtz) resembling the waves below, spotted near Tofino, British Columbia, Canada
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Subtle signs of fluctus (Kelvin-Helmholtz) spotted over Singapore
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Fluctus (Kelvin-Helmholtz) spotted over Seattle, Washington, US
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Fluctus (Kelvin-Helmholtz) spotted over southwestern Germany
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Fluctus (Kelvin-Helmholtz) spotted over Chicago, Illinois, US
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Fluctus (Kelvin-Helmholtz) spotted over Crank, Merseyside, England
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Fluctus (Kelvin-Helmholtz) spotted over Northern California, US
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Signs of fluctus (Kelvin-Helmholtz) spotted over Solihull, England
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Fluctus (Kelvin-Helmholtz) as seen through a reflection off of window panes, spotted over Bayside Place, Fukuoka City, Japan
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Fluctus (Kelvin-Helmholtz) at sunset over the Coast Range mountains west of Eugene, Oregon, US
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