weather theoryFAA-published question bank (Private Pilot, 2008)
What causes variations in altimeter settings between weather reporting points?
A
Unequal heating of the Earth's surface.✓ Correct Answer
B
Variation of terrain elevation.
C
Coriolis force.
Explanation
Unequal heating of the Earth's surface creates differences in air density and pressure from place to place, which is why sea-level altimeter settings vary between reporting stations (PHAK Chapter 12). Terrain elevation is removed by correcting the setting to sea level, and Coriolis force deflects wind rather than creating pressure differences.
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