This is a question & reply written by the 3rd ALS class of the IIS Caramuel-Roncalli of Vigevano for Evidence Network Academy.
A Firenado is a vortex of fire that forms when a current of hot air generated by a fire salt at high altitude is combined with a rotation of the air. This creates a mini-court of fire that can reach wind speed greater than 220 km/h. They usually form in the course of very large and intense fires. They generally last a few minutes.
Fire towards the sky. Their height varies from 10 to 50 meters against a few meters wide. But there are also exceptions as in the case of the Carr Fire that took place in 2018 in California, which generated a twist of fire with winds that reached 230 km/he a height of 5 km. Another took place in 1923 during the great Kantō earthquake in Japan, where a Firenado caused the death of 38 thousand people in just 15 minutes. Firenado are often confused with other phenomena such as the vortices of fire or the devils of fire, but are distinguished by their ability to extend from the ground to the base of the cloud above the fire.
