The autumn wind is bleak and the waves are rough. What does this sentence mean?

The bleak autumn wind blows, and the sea surges with waves. The magnificent sight the poet saw when he climbed the mountain to see the sea in autumn was magnificent.

This sentence comes from Cao Cao's "Looking at the Sea", the original text is "Jieshi sees the sea in the east". The sea is so vast that the islands stand high on the sea. Trees and paraquat are very lush. Autumn wind makes trees make sad sounds, and the sea is surging. The operation of the sun and the moon seems to be from the vast ocean. This poem expresses the author's lofty sentiments by describing natural scenery such as autumn wind and Hongbo.