Another form that the cirro stratus may assume is the mackerel sky,—clouds with the light and shade of the scales of a fish.
The sky was what is called a mackerel sky--rows and rows of faint down-plumes of cloud, just tinted with the midsummer sunset.
It was a mackerel sky of a very bold and extraordinary kind—not a dish of mackerel, but a world of mackerel!
The old proverb, “mackerel sky, soon wet or soon dry,” expresses this uncertainty.
I have never met with ten persons who applied even the term “mackerel sky” to the same precise form of cirro-stratus.
There was a mackerel sky, with the clouds dropping on the mountain-tops till you could hardly say which was which.
The form known as the “mackerel sky” is not represented there.
"You can generally count on that mackerel sky furnishing a rain," he said.