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407 - ATPL - What conditions are most likely to lead to the formation of hill fog?

Question 407 - Meteorology - ATPL - Airline Transport Pilot license

High relative humidity and an unstable air mass.
Clear skies, calm or light winds, with relatively low humidity.
Humid stable air mass, wind blowing towards the hills.
Precipitation which is lifted by the action of moderate winds striking the range.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license