What portents appear in act 1 scene one of hamlet play?

* The appearance of the ghost. The ghost of Hamlet's father appears to Hamlet and tells him that he was murdered by his brother, Claudius, who is now king. This portends that Hamlet will be in danger from Claudius and that he will have to avenge his father's death.

* The unnatural behavior of the weather. The weather is described as being "unwholesome," "foggy," and "sick." This portends that something bad is going to happen.

* The warnings of the guards. The guards who see the ghost warn Hamlet that it is a bad omen and that he should not speak to it. This portends that the ghost will bring Hamlet trouble.

* The prophecies of the witches. The witches in Act 1, Scene 3 prophesy that Macbeth will become king. This portends that Macbeth will be driven by his ambition to commit murder and other evil acts.