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- Q201564 subject Q16779111.
- Q201564 subject Q16783693.
- Q201564 abstract "Cirrostratus /ˌsɪroʊˈstrɑːtəs/ is a high, very thin, generally uniform stratiform genus-type of cloud, composed of ice-crystals. It is difficult to detect and is capable of forming halos when the cloud takes the form of thin cirrostratus nebulosus. 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 nebulosus and turns to fibratus. If the cirrostratus begins as fragmented fibratus it often means the front is weak. Cirrostratus is usually located above 5.5 km (18,000 ft). Its presence indicates a large amount of moisture in the upper atmosphere.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 might follow in the next 12 to 24 hours or as soon as 6–8 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 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 "hazy 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.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) 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. 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.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.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.↑ ↑ ↑ ↑ ↑ ↑ ↑ 7.0 7.1".
- Q201564 thumbnail Cirrostratus_with_mock_sun.jpg?width=300.
- Q201564 wikiPageExternalLink cirrostratus.
- Q201564 wikiPageWikiLink Q1440391.
- Q201564 wikiPageWikiLink Q16779111.
- Q201564 wikiPageWikiLink Q16783693.
- Q201564 wikiPageWikiLink Q186310.
- Q201564 wikiPageWikiLink Q190096.
- Q201564 wikiPageWikiLink Q192196.
- Q201564 wikiPageWikiLink Q1981904.
- Q201564 wikiPageWikiLink Q1992226.
- Q201564 wikiPageWikiLink Q202145.
- Q201564 wikiPageWikiLink Q202278.
- Q201564 wikiPageWikiLink Q207546.
- Q201564 wikiPageWikiLink Q217651.
- Q201564 wikiPageWikiLink Q23392.
- Q201564 wikiPageWikiLink Q2365970.
- Q201564 wikiPageWikiLink Q25257.
- Q201564 wikiPageWikiLink Q2840505.
- Q201564 wikiPageWikiLink Q40526.
- Q201564 wikiPageWikiLink Q40564.
- Q201564 wikiPageWikiLink Q537536.
- Q201564 wikiPageWikiLink Q643546.
- Q201564 wikiPageWikiLink Q8074.
- Q201564 wikiPageWikiLink Q8104.
- Q201564 comment "Cirrostratus /ˌsɪroʊˈstrɑːtəs/ is a high, very thin, generally uniform stratiform genus-type of cloud, composed of ice-crystals. It is difficult to detect and is capable of forming halos when the cloud takes the form of thin cirrostratus nebulosus. 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 nebulosus and turns to fibratus.".
- Q201564 label "Cirrostratus cloud".
- Q201564 depiction Cirrostratus_with_mock_sun.jpg.