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Why does air spin faster and faster as it rushes into a tornado?
Tornado Formation lab · Last updated: 16 October 2026
You watch air rush into a tornado and find out why it spins faster and faster as it gets close to the centre. It is the same trick a figure skater uses when pulling in their arms. Understanding it helps explain why tornadoes are so destructive and how forecasters spot them.
What you'll discover
- A tornado is a narrow column of spinning air reaching from a thunderstorm cloud down to the ground.
- As spinning air is drawn inwards, it spins faster, just as a skater speeds up by pulling in their arms.
- Very low pressure at the centre of a tornado sucks in more air and keeps the spin going.
The science in plain words
Most strong tornadoes form beneath supercells, large thunderstorms with a rotating updraught. Winds that change speed and direction with height make the air near the ground roll over like a horizontal tube. A strong updraught can tip this rolling air upright, so the storm itself begins to rotate.
When rotating air is pulled inwards towards the centre, it speeds up. This is called conservation of angular momentum: if a spinning object brings its mass closer to its axis, it must spin faster. An ice skater who pulls in their arms spins faster for the same reason. In a tornado, air from a wide area is squeezed into a narrow column, so a gentle broad rotation becomes a violent narrow one. The strongest tornadoes have winds of more than 300 kilometres per hour.
The fast spin makes the pressure at the centre very low, which helps draw in more air from below. As air enters the low-pressure core it expands and cools, so water vapour condenses, which is why a tornado often shows as a visible funnel. Dust and debris picked up from the ground make it darker. Most tornadoes last only a few minutes. They are most common in the central United States, but they also occur in India and Bangladesh, especially before the monsoon.
Where it fits
- India, NCERT: Class 8 science, Chapter 6: Pressure, Winds, Storms, and Cyclones
- United States: Grades 6 to 8
- Next Generation Science Standards: MS-ESS2-5, MS-ESS3-2
Common questions
How does a tornado form?
Most strong tornadoes form in large thunderstorms called supercells. Winds changing direction with height set the air spinning, and the storm's updraught tilts that spin upright. As the rotation is stretched and narrowed, it speeds up until a tornado reaches down to the ground.
Why does a tornado spin so fast?
As air is drawn into a tornado, it moves closer to the centre of rotation, and spinning air speeds up when it moves inwards. This is conservation of angular momentum, the same reason a skater spins faster when pulling in their arms.
What is the difference between a tornado and a cyclone?
A tornado is small, often less than a kilometre wide, and lasts minutes, forming beneath a thunderstorm over land. A tropical cyclone is hundreds of kilometres across, forms over warm seas and can last for days. Both spin round a centre of low pressure.
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- Weather Patterns: Why does wind swirl round a storm instead of blowing straight in?
- Storm over the Town: Where will the lightning strike? Watch it feel its way down, then add a lightning rod.
- Roundabout Ride: Spin the roundabout. How hard must the spring pull to keep the toy going round?
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Try it yourself
The Tornado Formation lab is one of the interactive 3D science labs inside Taz. Change one thing, predict what will happen, then run it and watch. Labs open after you sign in.