weather theoryFAA-published sample question (ATM, Aug 2021)
You are planning a flight to the West Coast of the United States, which is currently below the published weather minimums for an ILS approach to that airport. The winds are forecast to increase to above 20 knots from the west at your scheduled arrival time. What weather conditions should you expect?
A
Visual meteorological conditions.
B
Advection fog will deepen with winds above 20 knots.
C
A layer of low stratus or stratocumulus is expected.✓ Correct Answer
Explanation
West Coast advection fog forms as moist Pacific air moves over cold water and land; the FAA's weather guidance notes that when winds exceed about 15 knots the turbulence lifts the fog into a layer of low stratus or stratocumulus. It does not deepen with stronger wind, and conditions are not expected to become VMC.
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