dust whirl - définition. Qu'est-ce que dust whirl
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Qu'est-ce (qui) est dust whirl - définition

METEOROLOGICAL PHENOMENON
Willywilly; Dust Devil; Dust devils; Willy willy; Dustdevil; Willy willies; Lava devils; Lava devil; Hay devil; Willy-willy; Snow devil; Debris devil; Dust whirl; Martian dust devil; Willy-Willy; Willi willi; Land devil
  • A dust devil in [[Krakow]], [[Poland]]
  • Large dust devil in Mexico

dust devil         
¦ noun a small whirlwind or air vortex over land, visible as a column of dust and debris.
willy-willy         
¦ noun (plural willy-willies) Austral. a whirlwind or dust storm.
Origin
from the Aborig. languages Yindjibarndi or Wemba-wemba.
Dust devil         
A dust devil is a strong, well-formed, and relatively short-lived whirlwind, ranging from small (half a metre wide and a few metres tall) to large (more than 10 m wide and more than 1 km tall). The primary vertical motion is upward.

Wikipédia

Dust devil

A dust devil (also known regionally as a "dirt devil") is a strong, well-formed, and relatively short-lived whirlwind. Its size ranges from small (half a metre wide and a few metres tall) to large (more than 10 m wide and more than 1 km tall). The primary vertical motion is upward. Dust devils are usually harmless, but can on rare occasions grow large enough to pose a threat to both people and property.

They are comparable to tornadoes in that both are a weather phenomenon involving a vertically oriented rotating column of wind. 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.