A interesting incident occurred recently in Australia, where local residents reported that the storm cell over their town had given rise to a particuarly damaging bout of wind which appeared, according to local residents, to have many of the characteristics of a tornado ("green" lighting, a roar like a jet engine, power flashes etc and winds damaging enough to rip the roofs and one level off a number of buildings and bring down power lines.) However the senior forecaster at the ABM said it could not be classified as a tornado as there were no reports of a funnel. I gather that how to define this particular storm has generated a lot of debate among storm chasers in Oz. So, does a tornado always have a funnel? Can it be a tornado without a funnel?