Discussion
Which conclusion follows from cyclostrophic balance about the sense of rotation?
Answer: B
The cyclostrophic equation contains the square of the wind speed, so it is satisfied equally by clockwise and anticlockwise circulation. Anticyclonic tornadoes are observed, though they are rare because most tornadoes descend from a cyclonically rotating mesocyclone. The pressure certainly is lower at the centre, but that constrains the magnitude of the wind rather than its sense. The angular momentum argument explains the observed preference without imposing any dynamical requirement.
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