Cumulopedia
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Altocumulus undulatus
Family B
Type Altocumulus
Occurrence Worldwide
Altitude 2000-5000m
Formation Lifting of a large air mass followed by condensation combined with atmospheric instability and wind shear at cloud level
Precipitation Light rain if cloud is thick
Potential Hazards May signal approaching frontal system
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Altocumulus Undulatus are patches or layers of small grains arranged in bands. They have a wavy appearance due to wind shear and usually cover only a small portion of the sky. Occasionally they form two or more overlapping waveforms. The presence of Altocumulus undulatus may indicate precipitation within the next 20 hours or simply a cloudy day.

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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