Mackerel sky (ger: Schaefchenwolken; fr: nuages moutonneux)
is a popular term for a sky covered with extensive cirrocumulus or altocumulus clouds arranged in somewhat regular waves and showing blue sky in the gaps.
mackerel sky"A sky with considerable cirrocumulus or small-element altocumulus cloud, resembling the scales on a mackerel; clouds of the variety vertebratus.
Maclaurin series"See Taylor's theorem.
MACKEREL SKY
The name given to cirrocumulus clouds with small vertical extent and composed of ice crystals. The rippled effect gives the appearance of fish scales.
MACROBURST ...
Altocumulus mackerel sky
These develop between 6,500 and 16,500 feet (between 2,000 and 5,000 m) and are denoted by the prefix alto-. They are made of water droplets, and are frequently supercooled.
Clouds in Family B include: ...
It often creates a "mackerel sky", since the ripples may look like fish scales. Sometimes it is confused with altocumulus, however, it has smaller individual masses and does not cast a shadow on other elements.
(Cc) High-level, white cloud which does not produce shadows. It consists of very small granular or rippled elements. This cloud is often described as "mackerel sky" cloud.
Cirrocumulus
Cirrostratus ...
 See also: Earth, Water, Clouds, Cloud, Cumulus
  
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