Discussion
Which force must be included when analysing flow around a tornado?
Answer: D
A tornado has a Rossby number of order a thousand, so Coriolis is entirely negligible while the centrifugal term dominates, giving the cyclostrophic balance between pressure gradient and curvature. This is why tornadoes may rotate in either sense, though most rotate cyclonically because they inherit the rotation of their parent storm. Gravity has no horizontal component, and friction matters at the surface but does not define the balance in the vortex itself.
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