We just learned that a fire whirl is a spinning column of burning air.
A firestorm is when a large area like a forest or a city is on fire, and the fire is so large that it starts making it's own wind that blows the fire around.
Sometimes the wind is so strong that it creates fire whirls, so the fire is spreading everywhere and there are fire like tornadoes spinning around.
(from: wikipedia - firestorm)
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