How is the bad weather emphasised by the author in ‘Macbeth’?

The weather in Macbeth is a form of pathetic fallacy in that it reflects the dark moods of the characters and the evil deeds being done. When Duncan is staying at the palace there is talk of a terrible storm where nature goes wild, and horses have even been reported to have attacked and eaten each other. This is a sign of the natural order being turned around - Macbeth's plans to kill a king. It relates to the chain of being whereby bad things would happen if you tried to take the wrong place in the chain or overthrow somebody else, which is exactly what the Macbeths plan to do.