Discussion
Assertion (A): A tornado must rotate cyclonically.
Reason (R): Cyclostrophic balance involves the square of the tangential wind speed.
Select the correct answer from the options below.
Answer: A
The reason is a correct statement of the balance, and because the wind appears squared the equation is satisfied by either sense of rotation, so the assertion is false. Anticyclonic tornadoes are documented, though rare, because most descend from cyclonically rotating mesocyclones. The example shows how the mathematical form of a balance can settle a question that intuition gets wrong.
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