A dual-vortex tornado is considered a symbol of apocalypse and is a sign of impending doom for some nature-worshipping cultists. The first vortex represents the material world, and the second signifies the opening of the gates of hell. Dual-vortex tornado flags have been used to trigger general despair and social collapse. This one was spotted near Dodge City, Kansas the first Spring season of the Trump Administration. 

Still waiting for the apocalypse (original posting, May 25, 2016).