We have a very interesting cloud phenomenon here in Australia called the Morning Glory Clouds, these cloud formations are found around the world but what makes them different in Australia is the fact that it is only in Northern Australia’s Gulf of Carpentaria that these clouds are not only frequent but they can also be predicted as well.
Most commonly seen in Burketown around September to November in the early hours of the morning. These clouds are like rolls and they can be up to 1,000 kilometres or 620 miles long, usually about 100 to 200 metres or 300 to 660 feet above the ground, they move about 60 kilometres or 37 miles per hour.
These clouds are not fully understood, but there have been different people, with different ideas on why these clouds form. The Morning Glory is often accompanied by sudden wind squalls, intense low-level wind shear, a rapid increase in the vertical displacement of air parcels, and a sharp pressure jump at the surface. In the front of the cloud, there is strong vertical motion that transports air up through the cloud and creates the rolling appearance, while the air in the middle and rear of the cloud becomes turbulent and sinks.
If you would like to know more Wikipedia has some information.