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Why do surface winds in a cyclone cross the isobars at an angle, while high-altitude winds blow parallel to them?
At high altitudes, air is “free” and balances perfectly between pressure and the Coriolis force, blowing parallel to isobars. Near the ground, however, friction from trees and buildings slows the wind down. Since the Coriolis force depends on speed, it weakens, allowing the Pressure Gradient Force to “win” the tug-of-war and pull the air inward across the isobars. ANSWER: (B) Friction at the surface disrupts the geostrophic balance.
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