A dust devil is a strong, well-formed, and relatively long-lived whirlwind, ranging from small (half a meter wide and a few meters tall) to large (over 10 meters wide and over 1000 meters tall). The primary vertical motion is upward. Dust devils are usually harmless, but rare ones can grow large enough to threaten both people and property.
They are comparable to tornadoes in that both are an unusual weather phenomenon of a vertically-oriented rotating column of air. Most tornadoes are associated with a larger parent circulation, the mesocyclone on the back of a supercell thunderstorm. Dust devils form as a swirling updraft under sunny conditions during fair weather, rarely coming close to the intensity of a tornado.
In the southwestern United States, a dust devil is sometimes called a "dancing devil". In Death Valley, California, it may be called a "sand auger" or "dust whirl".
The Australian "willy-willy" or "whirly-whirly" is thought to derive from Yindjibarndi or a neighboring language.
The Navajo refer to them as chiindii, ghosts or spirits of dead Navajos. If a chindi spins clockwise it is said to be a good spirit; if it spins counterclockwise it is said to be a bad spirit.
Egypt has its fasset el 'afreet or "ghost's wind".
Among the Kikuyu of Kenya, the dust devil is known as ngoma cia aka, meaning "women's devil/demon".
In Brazil a dust devil is called "redemoinho" after "moinho de vento" (windmill). In some traditions it contains a dancing Saci.
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