The "Morning Glory" roll cloud is a feature in the Gulf of Carpenteria, usually appearing in late September and early October. The unseasonal weather this year in the North has seen the cloud arrive early this year. Whilst roll clouds occur around the world, they appear with some regularity in the Gulf Country of Northern Australia. As a result, glider pilots flock to Northern towns such as Burketown (aprox population 200) in September/October to 'surf' the Glory.
I'm at work at the moment but have several links I can put up later which explain the meteorology and other conditions that lead to the formation of the Glory.
I was planning a trip to Burketown in September specifically to photograph the Glory, but due to other issues I've had to defer this to next year. The picture in the link is one of the best I've ever seen.
There have been record temperatures in Queensland in August, and it's likely that this winter will have been one of the warmest on record.