How to understand the weather by observing clouds?

Cirsium: Arranged in rows in the air, there is little water.

The above will not bring rain and snow.

Cumulus: Appears before a thunderstorm (sometimes bringing hail or tornado), like a cotton ball, usually at an altitude of about 2000 meters, appearing in the morning, at most in the afternoon, and gradually dissipating in the evening.

Altocumulus: Appearing on a clear day, it is a group of oblate clouds arranged symmetrically.

Cirrostratus: Continuous rain and snow will appear when it comes, like a white silk screen. When we push forward, the weather will turn cloudy.

High-level clouds: It often rains or snows within a few hours after it appears. Low position, thick clouds. You can't see the sun and the moon clearly through the clouds.

Rain and snow: Continuous rain and snow will come, lower and thicker.