A fire tornado's primary hazard is how fast it can spread fire. A fire tornado (more properly called a a firewhirl as it technically isn't a tornado) occurs when a massive fire, mostly a forest fire, slowly builds up heat. The warm air naturally goes upwards in a funnel shape, taking the flames with them.
If you could imagine a fire tornado dancing above highly flammable treetops, you know the true dangers of them. They can spread a forest fire a lot quicker than normal.
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