A dust devil is a strong, well-formed, and relatively long-lived whirlwind, ranging from small (half a metre wide and a few metres tall) to large (more than 10 metres wide and more than 1000 metres 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 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.
Dust devils rarely cause injury to people on the ground; however, 1 case is reported every 5 to 10 years. The exception is for parachutist under canopy and light aircraft near the ground. If seen, parachutist and light aircraft avoid dust devils. They can collapse parachute canopies, and if near the ground, re-inflation, or using the reserve parachute is not possible.
Read more about Dust Devil: Names, Formation, Intensity and Duration, Electrical Activities, Martian Dust Devils, Related Phenomena
Famous quotes containing the words dust and/or devil:
“Be it so, for I submit; his doom is fair,
That dust I am and shall to dust return.
O welcome hour whenever! Why delays
His hand to execute what his decree
Fixed on this day? Why do I overlive?
Why am I mocked with death, and lengthened out
To deathless pain? How gladly would I meet
Mortality, my sentence, and be earth
Insensible! how glad would lay me down
As in my mother’s lap!”
—John Milton (1608–1674)
“Those who consider the Devil to be a partisan of Evil and angels to be warriors for Good accept the demagogy of the angels. Things are clearly more complicated.”
—Milan Kundera (b. 1929)