What does it mean that fish scales in the sky don't have to be turned over to dry food?

There are fish scales in the sky, which means that if the clouds in the sky are shaped like fish scales, the weather will be fine.

Fish scale spots refer to fish scale clouds. The appearance of such clouds is a sign that the weather will clear up, and there will be clear skies in Wan Li and Wan Li for two or three days. The reason is that the cold air at high altitude sinks, breaking through the continuous clouds and forming fish scale clouds. Cold air sinks to the ground and is heated, so the water in the air evaporates, the relative humidity decreases, the air pressure rises, and the clouds also rise, resulting in continuous sunny days. This kind of cloud usually appears in autumn.

Extended data:

Fish scale clouds are at a relatively high altitude, and the clouds are thin and white, often arranged neatly in one or two directions. There are obvious gaps between clouds, and even the edges of seamless clouds are bright, which can distinguish the positions of the sun and the moon.

For wave clouds, clouds are well-defined, usually oblate, tiled, fish-scale or watery dense clouds. Arranged in groups, rows and waves. The apparent width angle of most clouds is 1-5 degrees. Sometimes it appears at two or more heights. Thin clouds are white and thick clouds are dark gray. On the thin cumulus clouds, there are often rainbow colors around the sun and the moon, or Chinese rings with red outside and blue inside.