Sydney in winter has some nasty east coast lows that can play havoc to even the best prepared boat.
Here is a forecast for the low of just a few weeks ago, 50 knot winds! that means gusts over 70 knots, serious stuff.
Just because your boat is tied up at a wharf or swinging on a mooring doesn't mean that you are any safer than a boat at sea in the same conditions.
If you can do so, take down your canvas biminis, dodgers and other bits that are there to protect varnish, otherwise you might find that what they are there to protect will actually be damaged by them as they flag in the wind after a fastening comes loose
Your furling headsail should be, removed (although I never see anyone do this) or at least tightly furled with no creases, an application of McLube SailkotePlus will ensure you achieve this furl, a few extra turns of the sheets around the sail too. Tie off tightly the sheets and the furling line. Its amazing watching a furled headsail unfurl and destroy itself from the head down.
Why are trimmers and sailmakers always full of work post these weather events?