What's the Story Morning Glory?

This is a really cool photograph.

The photo and story can be found here.

In essence, no-one is quite sure what causes them. But, it is thought that it might relate to a combination of hot and cooler air that circulates in a tube pattern. Apparently, these clouds can role on for a 1000 kms and up to altitudes of 2 kms, but only in the spring. These clouds were snapped over Burketown in Queensland, and published by NASA.