Causes columns of clouds to spin, and may form a funnel cloud. (2 words)

Wind shear

Explanation:

Wind shear (also called wind gradient) is a change in the direction and even the speed of wind and may be associated with strong inversions in temperature or changes in density. It causes the columns of clouds to spin, and may or may not form a funnel cloud.

Wind shear can be cause accidents especially in landing airplane as it causes a rapid change in lift, and consequently, in the altitude of the airplane.

answer; i do believe that the correct answer is : a deadly factory fire;

answer; its the top layer;