WHAT IS THIS?

These strange clouds were photographed in Queensland, which is the only place in the world where they form regularly.

Known as Morning Glory clouds, the phenomenon can be observed in the mornings of days with high relative humidity and forceful onshore wind.

The clouds consist of condensed air that rises rapidly on the front of the cloud and descends slowly at its centre and on the rear side.

The phenomenon occurs, when air with different characteristics meets, producing a rolling boundary. The cloud is produced at the top of the lower air mass.