In my opinion, the storm that Lear experiences out on the moor shows how far he has fallen. It shows that he is no longer an important man.
In the storm, we see Lear being pushed around by nature. In this, he is just like anyone else. It is also very similar to how he as been pushed around and defeated by his daughters and his own foolishness.
In addition, this storm symbolizes how Lear is going crazy. The chaos of the storm reflects the chaos that is going on in his own mind.
In my opinion, in king lear storm symbolies the up n down presents in lear's life. storm realises lear that thoug he is king n feel power but infont of nature he and his power is nothing. He learnt that he is just an ordinary man. It shows that power of nature is more strong than human being