An interesting look at a minor tornado

A British farmer took this video clip of a dust-devil (or whatever the British call such things - a dust dumpling, perhaps?) sucking up new-mown hay from a field on his farm.  I found it interesting because the wisps of hay perfectly illustrate the central high-speed vortex from time to time, while the wider bands of revolving air lift the hay more gently.

It's a good illustration of how a tornado works, even though the latter's much more powerful.

Peter