Cumulopedia
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Cirrus uncinus
Abbreviation Ci unc
Family A
Genus Cirrus
Occurrence Worldwide
Altitude >7000m, in troposphere
Formation Saturation of upper-level air mass combined with strong wind immediately below cloud level
Precipitation None
Potential Hazards Indicates an approaching frontal system (usually warm or occluded)
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Cirrus Uncinus have the shape of ponytails, commas, hooks or hooks. They gradually increase throughout the sky and may indicate the approach of a warm or occluded front; This is generally true if they are followed by Cirrostratus. That is, they indicate bad weather. They are formed by wind shear.

Clouds    
High Clouds (Family A): Cirrus (Ci) • Cirrus aviaticus • Cirrus intortus • Cirrus radiatus • Cirrus uncinus • Cirrus Kelvin-Helmholtz • Cirrostratus (Cs) • Cirrocumulus (Cc) • Pileus • Contrail
Middle Clouds (Family B): Altostratus (As) • Altostratus undulatus • Altocumulus (Ac) • Altocumulus undulatus • Altocumulus mackerel sky • Altocumulus castellanus • Altocumulus lenticularis
Low Clouds (Family C): Stratus (St) • Orographic stratus • Fog • Nimbostratus (Ns) • Cumulus humilis (Cu) • Cumulus mediocris (Cu) • Stratocumulus (Sc)
Vertical Clouds (Family D): Cumulonimbus (Cb) • Cumulonimbus incus • Cumulonimbus calvus • Cumulonimbus with mammatus • Cumulus congestus • Cumulus castellanus • Pyrocumulus  • Pyrocumulonimbus
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