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Fog Types

Moist, stable air is forced up a gentle slope, cools as it rises, and forms fog along the hillside. What is this called?

  • A.Advection fog over the ocean
  • B.Radiation fog in a valley
  • C.Upslope fog
Correct answer

C. Upslope fog

Why

Upslope fog forms when air is lifted along rising terrain and cools adiabatically to saturation. It can cover wide areas on the windward side of elevated terrain while winds remain light to moderate.

Source: FAA-G-8082-22 Ch. 3 · ACS knowledge area: Aviation Weather Sources and Effects · From the Aviation Weather practice bank (WEA-045).

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