What is a fire whirl? It's a whirlwind induced by a fire and often (at least partially) composed of flame or ash. In general, these tornadoes spin in grasslands or forests that experience long droughts or are burning. Whirl fire can occur when the air on the burning area will heat up and move up. At that time, cooler air from the surrounding area scrambled into the empty air. Then, the hot wind is constantly being recycled and continues to move up at an amazing speed. Upward winds can reach a trigger point that can create a fire storm, at this point the fire on land will be sucked up as well as houses, cars and other objects on the ground due to this hot wind. You should know that the fire temperature can reach 1100˚C. Also the height of the fire whirl can reach 10-60 m. other than that, fire whirls only last 3-5 minutes. For example, Fire in in Kanto, Japan in 1923. This fire whirl caused 38,000 lives and lasted for 15-20 minutes Source : https://www.livescience.com/4
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