1) Air pocket 2) Draft 3) Draught 4) Vertical air movement 
(from the article `updraft and downdraft`) in meteorology, upward-moving and downward-moving air currents, respectively, that are due to several causes. Local daytime heating of the ground ... ...stream but as one that is composed of a series of rising eddies. Cloud and precipitation particles form and grow as the cell grows. When the ....
A column of generally cool air that rapidly sinks to the ground, usually accompanied by precipitation as in a shower or thunderstorm. .
Downward movement of air in the atmosphere.
A column of generally cool air that rapidly sinks to the ground, usually accompanied by precipitation as in a shower or thunderstorm
[n] - a strong downward air current
noun a strong downward air current
a downward current, as of air: a downdraft in a mine shaft. · a downward movement, as of the stock market.