Fish scale clouds are a weather phenomenon that occurs in fall and winter when cold air is about to strike and rain follows.

Translucent altocumulus clouds, white clouds shaped like fish scales that appear in rows and columns, are a type of cloud formation that appears when strong cold air arrives, signaling unstable weather conditions. Translucent altocumulus clouds are thin, white, and often neatly aligned in one or two directions, with obvious gaps between the clouds, and even without gaps the edges of the clouds are brighter.

Fishscale clouds are large-scale clouds with regular, large gaps between them. The appearance of such clouds is a sign that the weather will clear up and there will be clear skies for two or three days. The reason for this is that cold air sinking at high altitude breaks through the continuous cloud cover, resulting in the formation of fish scale clouds. As the cold air sinks to the ground and is heated, the moisture in the air evaporates, the relative humidity decreases, the air pressure rises, and the cloud cover rises, resulting in continuous sunny skies. Such clouds usually appear in the fall and are a sign of impending fall weather.

Main features

Transparent high cumulus clouds, in general, before the cold air, clouds gradually thickened, and layer distribution, heavy clouds in each other "squeeze", it will show the shape of the fish scale clouds. Meteorological experts, this fish scale cloud accumulation to a certain extent will become rain clouds. Translucent high cumulus cloud is characterized by clouds at a relatively high altitude, the cloud is thin, white, often into one or two directions neatly arranged, there are obvious gaps between the clouds, even if there is no gap between the cloud edges are also brighter, can identify the sun, the moon position.

For wave-like clouds, the clouds are clearly defined, often flat round, tile-like, fish scale, or water wave-like dense cloud strips, in groups, rows, and wave-like arrangement. Most of the clouds have an apparent width angle of 1 to 5 degrees, and can sometimes appear at two or several heights. Thin clouds become white, and thick clouds are dark gray. In the thin altocumulus, there are often around the sun and moon iridescence, or the color of the outer red and inner blue Huahuan.