Comparatively speaking, this phenomenon is same as the explosion of an atomic bomb. Gigantic flow of hot air suddenly ascends and encounters the cold air above and then experiences a quick descend. The center of atomic explosion again causes hot air to continue to ascend. Hence forming a few circles of mushroom cloud.
Although we say that the other end of science is religion... This does not also mean that when some superstitious folks started a bonfire that causes a small whirlwind accompanied with seemingly human like light images, or the rises and falls of paper ashes as ghosts are collecting the hell money.
Sorry to debunk this myth but I just must put things right or things like the below will continue to happen: