Traditional Culture Encyclopedia - Weather inquiry - What is this phenomenon?

What is this phenomenon?

"Fish scale cloud", also called "sedimentary cloud", is a weather phenomenon when strong cold air comes in autumn and winter.

As the saying goes, "there are fish scales in the sky, and the wind will jump if it doesn't rain." The appearance of "fish scale cloud" indicates that the recent weather conditions are unstable, and there may be strong winds and rainfall after a short period of sunny days.