When forest fires subject to the right conditions, fire whirls, also called fire tornadoes can occur. Fires sometimes spawn their own winds as the flames consume oxygen, creating tornadoes filed with fire and noxious gases.
An "asperatus" cloud rolls over New Zealand's South Island in an undated picture. This apparently new class of clouds is still a mystery. Photograph courtesy Merrick DaviesExperts suspect asperatus clouds' choppy undersides may be due to strong winds