You don't need to go out driving today, you've got plenty of food in the cupboard, because you're all prepared for days like this - not that we ever expected snow like this in Porirua... but this is exactly the kind of unexpected event that you should prepare for!
Stay home, stay warm. You should also be prepared for power cuts, as heavy snow like this damages power lines - I've already had one power cut here.
If you absolutely have to drive somewhere, take it very slowly, and carefully. You're not going to get anything like normal traction or control.