imported>Perlwikibot |
|
| Line 1: |
Line 1: |
| | | #REDIRECT: [[Dust devil]] |
| #REDIRECT [[dust devil]] | |
| | |
| {{TermHeader}}
| |
| {{TermSearch}}
| |
| | |
| <div class="termentry">
| |
| <div class="term">
| |
| == dust devil ==
| |
| </div>
| |
| | |
| <div class="definition"><div class="short_definition">A well-developed [[dust whirl]]; a small but vigorous [[whirlwind]], usually of short [[duration]], rendered visible by [[dust]], sand, and debris picked up from the ground.</div><br/> <div class="paragraph">Dust devils occasionally are strong enough to cause minor damage (up to F1 on the [[Fujita scale]]). Diameters [[range]] from about 3 m to greater than 30 m; their average height is about 200 m, but a few have been observed as high as 1 km or more. They have been observed to rotate anticyclonically as well as cyclonically. Although the [[vertical velocity]] is predominantly upward, the flow along the axis of large dust devils may be downward. Large dust devils may also contain secondary vortices. Dust devils are best developed on a hot, [[calm]] afternoon with [[clear]] skies, in a dry region when intense surface heating causes a very steep [[lapse rate]] of [[temperature]] in the lowest 100 m of the [[atmosphere]].</div><br/> </div>
| |
| </div>
| |
| | |
| {{TermIndex}}
| |
| {{TermFooter}}
| |
| | |
| [[Category:Terms_D]]
| |
