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503 - FAA PPL(A) USA - Humid air at the surface, especially in summer, can cause:

Question 503 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

A stable air mass and clear skies
Instability and the formation of afternoon thunderstorms
Stable air and clearer visibilities

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