- Dust Devil
A small vortex made visible by a rotating cloud of dust or debris (a dust whirl). Dust devils form from surface heating of the ground during fair, hot weather, and are most frequent in arid or semi-arid regions, and are not associated with thunderstorms.
For "dust devil", Australians say "willy-willy" or "whirly-whirly", which come from the Yindjibarndi language, and represent "often quite scary spirits". Hey.