Bushfire tornado

Occasionally bushfires can create a range of wind vortexes. These can encompass smoke and create tornado looking like structures, some vortexes can form from flame itself. Though these tornados are not of the same type as the US tornado valley variety. 


A low intensity smoke bushfire induced tornado like wind vortex image: abc.net.au Siobhan Heanue

Fire tornados like other vortexes can vary in strength and intensity. A range of geographically features can influence how they behave. Bushfire vortexes tend to be formed by more localised turbulence patterns as a result of warm air rising and interactions of local down drafts (convection currents) from other clouds that may be forming near by. 

One small local area may become significantly hotter (due to intense fire) than another causing a pressure difference between two areas. There can then be enough thermal energy in the wind to sustain a vortex for an extended period of time.