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574 - FAA PPL(A) USA - The wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This difference in direction is primarily due to

Question 574 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

stronger Coriolis force at the surface
friction between the wind and the surface
stronger pressure gradient at higher altitudes

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane