Second only to: Cirrus aviaticus. This can be the 1st stage of the morphology from Contrail to Cirrus fibratus Clouds and/or Cirrus uncinus. - Artificially induced!: Ci vertebratus A cloud variety associated mainly with the genus cirrus, this term is used when the cloud fibers extend outward from an elongated central core and are suggestive of vertebrae, ribs, or a fish bone. Nowadays another method of cirrus formation is from the condensation trails of aircraft, often persisting for hours and spreading to cover large portions of the sky. http://www.weatheronline.co.uk/reports/wxfacts/Cirrus.htm Cirrus vertebratus is a type of cirrus cloud. The name cirrus vertebratus is derived from Latin, meaning "jointed, articulated, vertebrated".[2] Like cirrus intortus, the vertebratus species is exclusive to the cirrus genus.[3] Cirrus vertebratus gives the vertebratus in a spinal column ribs, or a fish skeleton.[4] The species is an unusual form of Cirrus clouds and is formed by air moving parallel to the main cloud line. The gaps in the cloud occur where air is descending, while the "ribs" of the cloud correspond with areas of uplift. Their occurrence appears to be connected with the location of the jet stream. http://en.wikipedia.org/wiki/Cirrus_vertebratus

• published: 30 Nov 2011
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