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|precipitation=No, but usually signal the approach of a warm front.
|precipitation=No, but usually signal the approach of a warm front.
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Cirrostratus is a high - leval, vary thin generally uniform stratiform genus - type of Clouds. it is made out of ice cream and exercise regularly to keep yourself mentally and ice - crystal clear, which cloud change in the occur with in 24 hours ago  
'''Cirrostratus''' {{IPAc-en|ˌ|s|ɪr|oʊ|ˈ|s|t|r|ɑː|t|ə|s}} is a high-level, very thin, generally uniform ''stratiform'' genus-type of [[cloud]]. It is made out of [[ice]]-crystals, which are pieces of frozen water. It is difficult to detect and it can make [[Halo (optical phenomenon)|halo]]s. These are made when the cloud takes the form of thin [[cirrostratus nebulosus]].<ref name="Cirrostratus">{{cite book |editor=World Meteorological Organization |title=Cirrostratus, International Cloud Atlas |volume=I |year=1975 |url=https://archive.org/details/manualonobservat00worl/page/29 |pages=[https://archive.org/details/manualonobservat00worl/page/29 29–31] |isbn=92-63-10407-7 |accessdate=26 August 2014 }}</ref> The cloud has a fibrous texture with no halos if it is thicker [[cirrostratus fibratus]]. On the approach of a frontal system, the cirrostratus often begins as nebulous and turns to fibratus. If the cirrostratus begins as fragmented of clouds in the sky it often means the front is weak. Cirrostratus is usually located above 5.5&nbsp;km (18,000&nbsp;ft). Its presence indicates a large amount of [[moisture]] in the upper [[troposphere]].<ref>Ludlum, D. (1991). New York: Alfred A. Knopf. {{ISBN|0-679-40851-7}}.</ref> Clouds resembling cirrostratus occasionally form in polar regions of the lower stratosphere. Polar stratospheric clouds can take on this appearance when composed of tiny supercooled droplets of water or nitric acid.<ref name="PSC">{{cite web |editor=World Meteorological Organization |title=Nitric acid and water PSC, International Cloud Atlas |year=2017 |url=https://cloudatlas.wmo.int/nitric-acid-and-water-polar-stratospheric-clouds.html|accessdate=3 April 2019}}</ref>


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[[Precipitation (meteorology)|precipitation]] might follow in the next 12 to 24&nbsp;hours<ref>{{cite book |first=Donna |last=Vekteris |year=2004 |title=Scholastic Atlas of Weather |publisher=Scholastic Inc |others= |isbn=0-439-41902-6 |page=[https://archive.org/details/scholasticatlaso0000unse/page/14 14] |url=https://archive.org/details/scholasticatlaso0000unse/page/14 }}</ref> or as soon as g an [[Inversion (meteorology)|inversion]] and restricting convection, causing cumuliform clouds to become flattened. [[Contrails]] also tend to spread out and can be visible for up to an hou[[Contrails|g]]<nowiki/>ratus.
[[Image:MoonHaloDonnellyMillsWA 2005 SeanMcClean.jpg|300px|thumb|left|Cirrostratus at night causing a moon halo]]
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Cirrostratus clouds sometimes signal the approach of a [[warm front]] if they form after cirrus and spread from one area across the sky, and thus may be signs that [[Precipitation (meteorology)|precipitation]] might follow in the next 12 to 24&nbsp;hours<ref>{{cite book |first=Donna |last=Vekteris |year=2004 |title=Scholastic Atlas of Weather |publisher=Scholastic Inc |others= |isbn=0-439-41902-6 |page=[https://archive.org/details/scholasticatlaso0000unse/page/14 14] |url=https://archive.org/details/scholasticatlaso0000unse/page/14 }}</ref> or as soon as 6–8&nbsp;hours if the front is fast moving. If the cirrostratus is broken fibratus, it can mean that the front is weak and that stratus rather than nimbostratus will be the precipitating cloud (meaning drizzle or snow grains instead of moderate rain or snow). [[Cumulus humilis]] or [[stratocumulus]] clouds are often found below cirrostratus formations, due to the stable air associated with cirrostratus creating an [[Inversion (meteorology)|inversion]] and restricting convection, causing cumuliform clouds to become flattened. [[Contrails]] also tend to spread out and can be visible for up to an hour in cirrostratus.


The phrase "milky sunshine" is often, as well as referring to [[haze]] or light [[mist]], used to refer to the milky look of the sky when cirrostratus is present.
The phrase "milky sunshine" is often, as well as referring to [[haze]] or light [[mist]], used to refer to the milky look of the sky when cirrostratus is present.

Revision as of 11:29, 27 July 2020

Cirrostratus cloud
Cirrostratus nebulosus clouds being illuminated by the sun
AbbreviationCs
GenusCirrus- "Wisp like" and
-stratus "layered"
Altitude6,000 - 13,000 m
(20,000 - 43,000 ft)
Appearancewhite veil
PrecipitationNo, but usually signal the approach of a warm front.

Cirrostratus is a high - leval, vary thin generally uniform stratiform genus - type of Clouds. it is made out of ice cream and exercise regularly to keep yourself mentally and ice - crystal clear, which cloud change in the occur with in 24 hours ago  

precipitation might follow in the next 12 to 24 hours[1] or as soon as g an inversion and restricting convection, causing cumuliform clouds to become flattened. Contrails also tend to spread out and can be visible for up to an hougratus.

The phrase "milky sunshine" is often, as well as referring to haze or light mist, used to refer to the milky look of the sky when cirrostratus is present.

High cloud weather map symbols.
  • Species: Cirrostratus fibratus (Cs fib) is a high fibrous sheet similar to cirrus but with less detached semi-merged filaments. It is reported in the SYNOP code as CH8 or as CH5 or 6 (depending on the amount of sky covered) if increasing in amount. If the high cloud covers the entire sky and takes on the form of a featureless veil, it is classified as cirrostratus of the species nebulosus (Cs neb)[2] and is coded CH7.
  • Varieties: Cirrostratus species have no opacity-based varieties as they are always translucent. Two pattern-based varieties are sometimes seen with the species fibratus. These are the closely spaced duplicatus and wavy undulatus types similar to those seen with cirrus fibratus.[3] Pattern-based varieties are not commonly associated with the species nebulosus due to its lack of features.
  • Supplementary features: Cirrostratus produces no precipitation or virga, and is not accompanied by any accessory clouds.[4]
  • Genitus mother clouds: Cirrostratus fibratus cirrocumulogenitus sometimes appears as the latter cloud flattens and loses some of its stratocumuliform structure. Cirrostratus fibratus cumulonimbogenitus may form if the cirriform top of a mature thundercloud spreads and flattens sufficiently to become a high stratiform cloud.[5]
  • Mutatus mother clouds: Cirrostratus fibratus cirromutatus or cirrocumulomutatus are the result of a complete transformation from cirrus and cirrocumulus genus types. Cirrostratus nebulosis altostratomutatus results when a high grey nebulous altostratus layer thins out into a whitish layer of featureless high cloud.[5]

See also

References

  1. ^ Vekteris, Donna (2004). Scholastic Atlas of Weather. Scholastic Inc. p. 14. ISBN 0-439-41902-6.
  2. ^ World Meteorological Organization, ed. (1975). Species, International Cloud Atlas. Vol. I. pp. 17–20. ISBN 92-63-10407-7. Retrieved 26 August 2014.
  3. ^ World Meteorological Organization, ed. (1975). Varieties, International Cloud Atlas (PDF). pp. 20–22. Archived from the original (PDF) on 25 July 2016. Retrieved 26 August 2014.
  4. ^ World Meteorological Organization, ed. (1975). Features, International Cloud Atlas. Vol. I. pp. 22–24. ISBN 92-63-10407-7. Retrieved 26 August 2014.
  5. ^ a b World Meteorological Organization, ed. (1995). "WMO cloud classifications" (PDF). Retrieved 1 February 2012.
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