That's a 'dust devil,' and there's a half dozen more whirling in our direction.

We're going to have a sand storm." Ned looked with interest.

The "dust devils," rising up like water spouts, danced over the surface of the sand.

They were a half dozen, then a dozen, then twenty.

A sharp wind struck the faces of the two fugitives, and it had an edge of fine sand that stung.