There are two principle themes in Lear's angry raging in this scene, and that is the injustice of the gods and Lear's own anger at his daughters and what they have done to him. What is key to realise in this scene, which is when Lear and the Fool wander around on the storm-blasted, desolate plain, is that the weather is a powerful pathetic fallacy that serves to mirror the anger in Lear's own heart as he realises fully just how terribly his daughters have treated him:
I tax not you, you elements, with unkindness.I never gave you kingdom, called you children.You owe me no subscription. Why then, let fallYour horrible pleasure.
But yet I call you servile ministers,That will with two pernicious daughters joinedYour high engendered battles 'gainst a headSo old and white as this. Oh, ho! 'Tis foul.