Huge system has evolved over the past 48 hours.
Low level snow has continued today, check out the graphic here.
I quickly sketched a rough drawing of the seperation of the warm and cold air.
Notice how big the cold air field is, goes almost to the bottom of the page which is almost Antarctica.
The yellow arrows indicate the direction its moving. Now that the cold air has caught up with the warm air, expect an eruption for NSW and Queensland of violent weather next 24 hours.