At 4pm I was quietly minding my own business doing some paperwork, suddenly the sky went black, the trees surrounding our office started to dance and the lights began to flicker. Our graphics lady then came to tell me it might be a good idea to save the work on the computer. The next minutes were surreal. A tornado passed through the northern suburbs and peeled the roof off one of the posh private schools. The Interislander ferry couldn't berth in the harbour and had to bob around for a while before it could come alongside.