It seems as though your weather is as barmy as ours. After all the hot temperatures and bushfires we have now inundation. Yesteryear we had a total of 500.2mm of rainfall. Less than six weeks into the new year we have already had 534mm of drips and drops on our roof tops.
(Dujon) I had a look at OZBOM, excellent as usual, but it seems I've just missed the action. I find it more difficult to interpret synoptic charts for semi-tropical latitudes than for areas like Britain. Maybe just a case of what you're used to. Your rainfall of 534 mm in 6 weeks is phenomenal. That's about 13 mm a day,every day. The "best" I've done in that style is 574 mm in three months, winter 2013-14.