Roadside Dustdevil

This photo was taken from swiftly moving car, between Gawler and Roseworthy. We had been seeing a pillar of dust from several kilometres away, itself moving across the landscape at a speed in the tens of kilomtres. It was whipping up quite a wind within itself, and looked like a dust devil. This high zoom photo is of its base. Not very spectacular looking, but you get an idea of its scale. I have seen these tornado like winds pick up objects weighing over 50 kgs and hurl them a hundred metres, out of the blue on an otherwise calm day.