Which clouds indicate rain, and what kind of clouds indicate rain?

Cirrocumulus and hook clouds appear in the sky, which indicates that it will rain.

1, cirrocumulus:

Cirrocumulus is a kind of cloud with an altitude of about 5500 meters. The cloud is small and white. They are composed of small white scales or spherical clouds, often arranged in rows or groups, much like small ripples caused by a breeze blowing over the water. If the sky clouds are mainly distributed in cirrocumulus, it usually indicates unstable rainy weather and windy weather. The agricultural proverb "Fish-scale sky, even if it doesn't rain, the wind will jump" refers to such a cloudy day.

Step 2 hook cloud

"Clouds are hanging in the sky and the ground is raining" is a common folk proverb. In meteorology, the "hook cloud" in this proverb is called hook cirrus. Hook cirrus usually appears in the troposphere at an altitude of 1000 meters. Clouds are thin and white, and they are often arranged in parallel, with small hooks or clusters at the top and long tails at the bottom, much like comma symbols. There is usually a front behind this cloud. When it systematically moves to the sky and continues to develop, it is a common weather phenomenon to wind and rain.