abstract:A downburst is a strong ground-level wind system that emanates from a single source, blowing in a straight line in all directions from that source. Often producing damaging winds, it may be confused with a tornado, but is actually quite different: In a tornado, high velocity winds circle a central point, moving inward and upward whereas in a downburst, winds are directed downward and then outward from the surface landing point.
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a very high-speed downward movement of turbulent air in a limited area for a short time. Near the ground it spreads out from its centre with high horizontal velocities 下击暴流; 一种具破坏性的下沉气流，在地面或靠近地面产生 (Also called microburst)