 As distinct from the dust devil, it is improbable that the height reached by the fire gas vortex is greater than the visible height of the vertical flames because of turbulence in the surrounding gases that inhibit creation of a stable boundary layer between the rotating/rising gases relative to the surrounding gases.Hot cinders underneath freshly deposited ash in recently burned areas may sometimes generate numerous dust devils.The lighter weight and the darker color of the ash may create dust devils that are visible hundreds of feet into the air.