Fire devils or fire whirls are sometimes referred to as fire tornadoes, but they are generally not considered true tornadoes.
a tornado in the form of fire
The "fire tornado" forms from the fire; it doesn't really matter how the fire starts. Also, a "fire tornado" is more properly called a fire whirl as it technically isn't a tornado.
a tornado in the form of fire
fire and air makes a fire tornado, also known as the fire devil or fire whirl.
A fire tornado, more properly called a fire whirl, forms in a manner akin to that of a dust devil, only the source of heat is a fire rather than the sun. The ingredients needed for a fire whirl are an intense fire, and wind with some hint of vorticity (spin), which can occur as the wind interacts with the ground and vegetation. The fire creates an updraft which then takes on vorticity, pulling it into a tighter, more intense vortex.
A "fire tornado" is not a true tornado but a whirlwind spawned by an intense fire. If such a fire is approaching the area where you live you should evacuate immediately.
A fire devil or fire whirl is the more dangerous of the two, though they are both potentially deadly. Fire whirlds can produce wind speeds comparable to a tornado of moderate intensity, but are most dangerous for their ability to spread a fire quickly. The flames in a fire whirl burn hotter than in a normal flame. Landspouts are technically tornadoes, but are generally not as strong as supercell-spawned tornadoes. Landspouts rarely exceed EF1 intensity. These tornadoes can occasionally kill, but are unlikely to harm someone who takes adequate shelter.
A "tornado" of fire is called a firewhirl, but these are not true tornadoes.
The Devil's Fire has 228 pages.
A dust devil resembles a tornado on some levels, but is not as strong and does not form from a thunderstorm.
No. A "sand tornado" (which is a dust devil, not an actual tornado) will move in whatever direction the wind around it is blowing.
A dust devil is called a mini tornado because it looks similar to a tornado in appearance, with a spinning column of air picking up dust and debris. However, dust devils are much smaller and weaker than tornadoes, typically only reaching speeds of up to 60 miles per hour.