Definition, Meaning & Synonyms | English word ALTOSTRATUS

Definitions of ALTOSTRATUS

1. (physics, meteorology) A principal medium-level cloud type in the form of a gray or bluish (never white) sheet or layer of striated, fibrous, or uniform appearance.

Examples of Using ALTOSTRATUS in a Sentence

• A sheet of partially conjoined altocumulus perlucidus is sometimes found preceding a weakening warm front, where the altostratus is starting to fragment, resulting in patches of altocumulus perlucidus between the areas of altostratus.
• Altostratus clouds are usually gray or blueish featureless sheets, although some variants have wavy or banded bases.
• They often extend from the base of a cumulonimbus cloud, but may also be found under altostratus, and cirrus clouds, as well as volcanic ash clouds.
• A thickening and lowering of these high clouds into middle-stage altostratus or altocumulus is a good sign the warm front or low has moved closer and precipitation may begin within less than six hours.
• When sheet of altostratus cloud is seen lower down and skirting a cumulonimbus cloud, it is classified as a velum cloud.
• Any of the stratus family of clouds (fog, stratus clouds, altostratus clouds, cirrostratus clouds, nimbostratus clouds) and the precipitation coming from them.
• Fractonimbus exist only under precipitation clouds (such as nimbostratus, altostratus or cumulonimbus), and don't produce precipitation themselves.
• Areas of cirrocumulus and altocumulus within cirrostratus and altostratus more commonly seen than at a warm front.
• Opacus is a cloud variety that is found in stratocumulus, altocumulus, altostratus, and stratus cloud types.

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