What does Xishan Yun Qi mean?

Xuan: Black. Yun Xuan: Dark clouds, dark clouds.

Dark clouds rise from the western hills: dark clouds are generated and spread on the mountains in the west.

Serina Liu's poems;

A breeze is blowing from the east. Yun Xuan rises in the western hills.

Send this anger at night. Fly to Ganquan tomorrow.

The general idea is:

A breeze is blowing slowly from the east,

Dark clouds rose quietly in the western hills.

Whenever this weather occurs when it is dark,

It will rain cats and dogs tomorrow morning.

In some parts of China, there has been a proverb about the weather since ancient times: "Look at the southeast early and look at the northwest late." It means that when the local weather is fine, a large number of cumulonimbus clouds appear in the southeast in the morning or in the northwest at night, and it will rain heavily soon.