down-burst

downburst

[doun-burst]
noun
a strong downward current of air from a cumulonimbus cloud, often associated with intense thunderstorms.

Origin:
down1 + burst

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Collins
World English Dictionary
downburst (ˈdaʊnˌbɜːst)
 
n
Also called: microburst 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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
downburst   (doun'bûrst')  Pronunciation Key 
An extremely powerful downward air current from a cumulonimbus cloud, typically associated with thunderstorm activity. Downbursts can produce effects that resemble those brought about by tornadoes.
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