Why do tornadoes spin?
Show answer & explanation
Answer: Wind shear creates rotation
Earth's rotation makes them spin — Wrong. Earth's rotation (Coriolis effect) affects large systems like hurricanes but is too weak to create tornadoes. Tornado spin comes from wind shear - winds at different heights moving in different directions.
Wind shear creates rotation ✓ — Correct! Tornadoes form when winds at different heights blow in different directions or speeds (wind shear). This creates a horizontal spinning effect. When a powerful thunderstorm updraft tilts this rotation vertical and tightens it, a tornado forms. As the spinning column narrows (conservation of angular momentum), it spins faster - like a figure skater pulling in their arms!
Lightning creates spinning air — Wrong. Lightning is an electrical discharge and doesn't create spinning air. Tornado rotation comes from wind shear - different wind speeds at different heights creating rotation that gets tilted and tightened by updrafts.
More Weather & Climate questions
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- Why do hail researchers simulate the paths individual hailstones take through a storm instead of just counting how many thunderstorms occur?
- Why does hail reach the ground smaller and less often in the tropics than in mid-latitudes?
- Why can one hailstone have both clear and cloudy ice layers instead of growing in one simple up-and-down path?
- Why is the coldest storm top not the best place for hail to grow?
- Why do supercells make 5-cm hail when ordinary storms usually cannot?