Conquest of the Horde

You could just make your predictions very vague, like most psychics. There was a famous Irish psychic who came on live tv to do some contacting of the dead. So she asks this huge crowd of Irish people,

"Has anyone here lost a Mary?"

A forest of hands shoot up.






/facepalm

Perhaps predictions can be made on fluctuations of the amount of mana that flows through the lines, like reading the palm of you hand.

One thing is sure, the nexus of ley lines under deadwind pass create some kind of weakened reality that causes visions to float around.