This incredible cloud formation is known as Morning Glory. It is usually only seen in the early morning and disappears when the sun gets warmer later in the day.
These photos were taken from Sweers Island in northern Australia, which is the most popular place to view these clouds, but they can also occur in some other places around the world, there was even one seen in Scotland.
Perhaps the best view is from above the cloud. Because of hot air rising from the cloud it is even possible to ‘surf’ the cloud.