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Optical Effects
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Asperitas in the late afternoon near Vermontville, Adirondacks, New York, US
It looks calm, but Monica conveyed that it was very windy when she found the perfect place to pull her car over and take this photograph of the full rainbow over Mono Lake, California, US
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Virga amidst a colourful background, spotted over Cambridge, England
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Supercilium, a short-lived cloud feature which appears in turbulent airflow over, and to the immediate lee of, steep mountain peaks during periods of strong mountain summit level winds, was spotted by Ann while skiing at Sugerbush. She described it as an ever changing cloud formation that once appeared as bushy brows, and then moments later transformed and mimicked distant mountains, and then subsequently looked like cobwebs. This cloud "art" was seen near Warren, Vermont, US.
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Stratocumulus asperitas clouds, like these spotted by Mickey's husband, Chuck Neil, while snowshoeing, are characterized by turbulent waves that look like the surface of a rough sea. This expansive display of asperitas was spotted along South Hegman Lake, Boundary Waters Canoe Area Wilderness, Ely, Minnesota, US
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A primary rainbow along with a subtle secondary rainbow over Atagohama Central Park, Fukuoka City, Japan
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Arcus, also known as a shelf cloud, marks the leading edge of a storm system near The Entrance North, New South Wales, Australia
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Crepuscular rays over Zagreb, Croatia
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Horseshoe vortex spotted in between summer thunderstorms over Torquay, Victoria, Australia
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A roll cloud, which is a form of an arcus cloud, spotted near the North West Shelf off of Western Australia
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Altocumulus lenticularis, along with lenticularis that appear to be at the stratocumulus level in the background, spotted near Torres Del Pine, Patagonia, Chile
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Horseshoe Vortex spotted over Chester County, Pennsylvania, US
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Fluctus (Kelvin-Helmholtz) spotted near the Golden Gate Bridge in San Francisco, California, US
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Asperitas and lacunosus spotted over Pittsburgh, Pennsylvania, US
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Lacunosus, a rare, short-lived formation, is identified in terms of the gaps between cloud elements, rather than the clouds themselves. It is when a cloud layer is composed of more or less regular holes, around which fringes of cloud form, like a net or rough honeycomb. The holes of this variety are formed by sinking pockets of air, and the cloud fringes around them by air rising up between the pockets to replace them. Such sinking can occur when a layer of cooler air finds itself over a warmer one. Being more dense, the cooler air sinks down through the warmer air. This classic example was spotted on a cold morning over Priddy, Somerset, England.
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Fluctus (Kelvin-Helmholtz), or as Ursula quipped, "Oh! Wow! It's those Meyer, er, Maier, oh, Meyerholz?, er, those wave clouds!" This classic example of fluctus was spotted over Sunnyvale, California, US.
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