Long winded article on how & why is here:
www.seabreeze.com.au/info/wind.aspIt's a classic weather pattern, high in the bight, trough down the west coast. Just gotta wait for the next high cell to come on through... which is due Fri/Sat, and the breezes start again....
When you view the 7 day forecast graph, click on the graph, and it will show you the synoptic....