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What does the appearance of scaly clouds mean?

Altocumulus translucent clouds are also called scale clouds. If these clouds remain unchanged (thicken) for a long time, it means that it will be sunny for a period of time in the future. However, if the clouds of scale clouds begin to thicken, the clouds and When the gaps between clouds become smaller, windy weather and even rainfall may occur.

One situation: If there are rules between the clouds of the fish scale cloud (such as strips or meshes), and the gaps between the clouds are relatively large. Then the appearance of such clouds is a sign that the weather will clear up and there will be clear skies. This situation often occurs in autumn.

Another situation: If the fish scale clouds gradually thicken and become layered, or the gaps between the clouds shrink, this means that the translucent altocumulus clouds have transformed into cumulonimbus clouds, which may soon become It will rain. This mostly happens in the summer.

Extended information

The reason for the formation of scale clouds:

When the sun shines on the surface of the earth, water evaporates to form water vapor. Once the water vapor is supersaturated, the water molecules Clouds are created when water droplets or ice crystals gather around tiny particles of dust (condensation nuclei) in the air and scatter sunlight in all directions.

Because clouds reflect and scatter electromagnetic waves in all bands, the color of clouds is grayscale, and white when the clouds are thin, but when they become too thick or dense to allow sunlight to pass through, they Can appear gray or black.

When the clouds become thicker, the cold air in the sky will sink and break through the clouds. After sinking to the ground, it will be heated by the ground, causing the ground air pressure to rise, and the clouds will rise accordingly. In medium conditions, there will be clear skies.

When cold air comes, the clouds will thicken and become densely layered. Because the layers are close to each other, they will collide. In this case, the shape of fish scales will also appear, but This situation will bring rainfall.

Baidu Encyclopedia - Translucent Altocumulus