downdraught

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downdraught

(ˈdaʊnˌdrɑːft) or

downdraft

n
(Physical Geography) the large-scale downward movement of air in the lee of large objects, mountains, etc
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Intensely active cumulonimbus builds very rapidly, the turbulence within such a cloud sees clashing vertical upthrusts and downdraughts immediately alongside each other and even meeting head-on so driving the downdraught forcibly aloft, by tens of thousands of feet, well above the freezing level, hailstones will already be present and such activity sees collision and accumulation.
During the winter, window interior temperatures usually fall below indoor air temperature, causing thermal discomfort due to radiant temperature asymmetry, low operative temperature, and downdraughts.
There were further downdraughts in 1931, but the final slaughter came a year later, when share prices plunged to depths visited half a century earlier.
39 Generally cumulonimbus (heaped dark clouds) are the most dangerous clouds associated with hail, lightning, tornadoes, downdraughts, downbursts and flash flooding.