Tornadoes are violently rotating columns of air that extend from a thunderstorm cloud down to the ground, capable of producing extreme wind damage over narrow but sometimes very long paths. They are among the most intense weather events on Earth, with the strongest tornadoes reaching winds well over 200 miles per hour and destroying even well‑built structures.

What tornadoes are

  • A tornado is a rapidly rotating column of air connecting the base of a thunderstorm to the ground.
  • Most tornadoes come from powerful thunderstorms; the most violent ones form from supercells, which are storms with a rotating updraft.
  • Tornadoes appear as funnel‑shaped or rope‑like clouds, but can be hard to see when wrapped in rain or dust.

How tornadoes form

  • They typically develop when warm, moist air at low levels meets cooler, drier air aloft, creating unstable conditions and strong wind shear (changes of wind with height).
  • Wind shear can create a horizontal roll of air that a storm’s updraft tilts vertically, helping a rotating column of air tighten into a tornado.
  • Only a small fraction of thunderstorms become supercells, and only a fraction of supercells actually produce tornadoes.

Strength, size, and speed

  • Tornado intensity is rated on the Enhanced Fujita (EF) scale from EF0 (weak) to EF5 (incredible damage), based on the damage observed rather than direct wind measurement.
  • The strongest tornadoes can have estimated winds above 200–250 miles per hour (around 320–400 km/h), capable of leveling well‑built houses and deforming large buildings.
  • Typical tornadoes are a few hundred meters wide and last around 10 minutes, but some have grown more than a mile wide and remained on the ground for over 50 miles and more than an hour.

Impacts and safety

  • In the United States, about 1,000 tornadoes are reported in an average year, causing dozens of deaths and thousands of injuries.
  • Most injuries and fatalities come from flying debris—pieces of buildings, glass, vehicles, and trees picked up and hurled by the winds.
  • Safety guidance emphasizes going to a small, windowless interior room on the lowest floor, or an underground shelter; mobile homes and cars are considered particularly unsafe during a tornado.

Where and when tornadoes happen

  • Tornadoes have been recorded on every continent except Antarctica, but they are most common in the central United States, an area often called “Tornado Alley.”
  • In the U.S., tornado season tends to peak in spring and early summer, shifting from the southern Plains in spring to the northern Plains and Midwest later in the season, though they can occur any month of the year.
  • Recent statistics show states like Texas and parts of the central Plains and Midwest regularly reporting the highest annual tornado counts.

Information gathered from public forums or data available on the internet and portrayed here.