→ Asperitas Clouds Over New Zealand
Image Credit & Copyright: Witta Priester
What kind of clouds are these? Although their cause is presently unknown, such unusual atmospheric structures, as menacing as they might seem, do not appear to be harbingers of meteorological doom. Formally recognized as a distinct cloud type only last year, Asperitas clouds can be stunning in appearance, unusual in occurrence, and are relatively unstudied. Whereas most low cloud decks are flat bottomed, asperitas clouds appear to have significant vertical structure underneath. Speculation therefore holds that asperitas clouds might be related to lenticular clouds that form near mountains, or mammatus clouds associated with thunderstorms, or perhaps a foehn wind -- a type of dry downward wind that flows off mountains. Such a wind called the Canterbury arch streams toward the east coast of New Zealand's South Island. The featured image, taken above Hanmer Springs in Canterbury, New Zealand, in 2005, shows great detail partly because sunlight illuminates the undulating clouds from the side.
A unique weather photo from the Ottawa Valley, Ontario, Canada from several years ago. A mammatus-type cloud formation appeared before a rather large thunderstorm. This photo shows one of only two occasions that I’ve witnessed mammatus clouds (as far as I recall). Has anyone else observed mammatus clouds?
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MAMMATUS CLOUDS are pouch-like protrusions hanging from the undersides of clouds, usually thunderstorm anvil clouds but other types of clouds as well. Composed primarily of ice, these cloud pouches can extend hundreds of miles in any direction, remaining visible in your sky for perhaps 10 or 15 minutes at a time. #cloud#clouds#clouds ☁ #mammatus#mammatusclouds#georgetown#texas