Two of natures most mysterious versions of tornadoes is the firenado and snownado. In a firenado, a pocket of really hot air at the surface mixes with cold air aloft and a slight shift in wind direction and the vortex of fire spins up and creates the firenado. These particular meteorological phenomenon are incredibly dangerous as the fire in a firenado spreads quicker than that of your normal forest fire. The snownado has opposite conditions to that of a firenado. Cold air at the surface mixes with warm air aloft causing the cyclone. The danger of a snownado is the dramatic decrease in visibility.