Inside the cloud, the rain cools the air, which become more dense and they go down to the ground. To get a tornado from these supercell thunderstorms, we need more powerful winds. These supercell thunderstorms can stay active for hours with heavy rain, hailstone and thunders. By then the full cloud starts to rotate, which by now can be called a supercell thunderstorm. This gives finally an inclined rotating tube of air inside the cumulonimbus, which is called a mesocyclone. This horizontal tube will be pushed to the vertical by the ascending air of the cumulonimbus. This will induce a horizontal rotation inside the cloud. To get a supercell thunderstorm, there needs to be a wind speed variation (more quickly with the altitude) or directions variation with the altitude. This cycle is the standard cycle of a thunderstorm, but we still don’t have a supercell. If the air above is cold and dry enough and they air that rise warm and wet enough, it will continue to raise until the tropopause to form a cumulonimbus. The wet air parcel will condense and form a cumulus cloud. The air parcel, by rising up, will meet a cold and dry air. This air that escape from the ground is warmer and so less dense. Indeed, the sun warms the ground, giving a warm and wet air parcel. These storms are very powerful thunderstorms that form essentially in summer. Most of the tornadoes form in a supercell thunderstorm. Tornadoes form only under very precise conditions. How are tornadoes formed Diagram explaining the formation a tornado The 10 most deadliest tornado in the world.Categories of tornadoes (Enhanced Fujita scale).But before explaining their distribution around the world, we need to understand how they formed. Indeed, some regions are more vulnerable and more exposed to tornadoes. According to the World Meteorological Organization, tornadoes kill between 300 and 400 people each year and including 150 only in the United States. ![]() Weather and Climate | Home / Weather and Climate / Tornadoes around the world Tornadoes around the worldĪ tornado (also called a twister) is an extreme meteorological event that can be very dangerous for populations and can cause a lot of damage.
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