mackerel sky

Etymology
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Noun

 * 1) A sky filled with a regular pattern of altocumulus clouds somewhat resembling the skin of a mackerel.
 * 2) * 1717, Dictionarium Rusticum, Urbanicum & Botanicum, London: J. Nicholson et al., 2nd edition, “CLOUDS,”
 * in a fair day, if the Sky seem to be dappled with white Clouds, which is usually termed, A Mackerel-Sky, it commonly predicts rain:

Translations

 * Czech:
 * French: ciel moutonné
 * German: ,
 * Irish: spéir dhroim an ronnaigh, spéir ronnach
 * Maori: māra kūmara a Ngātoro-i-rangi, rangi kōpukupuku
 * Spanish: