Genus altostratus List of cloud types

altostratus translucidus (v-49) near top of photo merging altostratus opacus (v-50) near bottom

abbreviation: as

stratiform clouds of genus altostratus form when large convectively stable airmass lifted condensation in middle level of troposphere, along frontal system. altostratus can bring light rain or snow. if precipitation becomes continuous, may thicken nimbostratus can bring precipitation of moderate heavy intensity.

species

no differentiated species (always nebulous).




opacity-based varieties

altostratus translucidus (v-49)

altostratus through sun can seen.
altostratus opacus (v-50)

altostratus blocks out sun.








pattern-based variety radiatus

bands appear converge @ horizon.

altostratus translucidus radiatus (v-51)
altostratus opacus radiatus (v-52)








pattern-based variety duplicatus

altostratus in closely spaced layers, 1 above other.

altostratus translucidus duplicatus (v-53)
altostratus opacus duplicatus (v-54)








pattern-based variety undulatus

altostratus wavy undulating base.

altostratus translucidus undulatus (v-55)
altostratus opacus undulatus (v-56)












precipitation-based supplementary features

virga

accompanied precipitation evaporates before reaching ground. seen opacus varieties.
praecipitatio

produces precipitation reaches ground; associated opacus varieties.
















cloud-based supplementary feature

mamma

altostratus downward facing bubble-like protuberances caused localized downdrafts within cloud.
















accessory cloud

seen opacus varieties

pannus

accompanied ragged lower layer of fractus species clouds forming in precipitation.
















genitus mother clouds

altostratus altocumulogenitus
altostratus cumulonimbogenitus
















mutatus mother clouds

altostratus cirrostratomutatus
altostratus nimbostratomutatus












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