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mackerel sky 魚鱗天〔有卷積云的天空〕。

mackinaw

Mackerel sky , not twenty - four hours dry describes the deterioration of weather after the appearance of cirrocumulus clouds . although it may be bright at the beginning , the weather will deteriorate in half a day s time as the cyclone or front approaches . as they pick up more moisture , the cirrocumulus clouds thicken and extend downward to become low - level clouds which bear rain 魚鱗天,不雨也風顛是形容卷積云出現后天氣轉壞的狀況,雖然初時天氣明朗,但約半天光景后,天氣會隨氣旋或鋒面的移近而轉壞,風速增強,卷積云也會隨著水氣增加而逐漸增厚,云層向下伸延轉為低層云,產生降雨。

“ mackerel sky , not twenty - four hours dry “ explained 魚鱗天,不雨也風顛解說