On a clear，warm day，you notice the approach of a tall cumulus cloud. The cloud top has hard well defined edges and rain is falling from the dark lower edge. Should this cloud pass directly overhead（）.

A. it will be preceded by a sudden increase in wind speed
B. it will be preceded by a sudden decrease in wind speed
C. the wind speed will not change as it passes
D. the wind will back rapidly to left in a counterclockwise direction as it passe