Home › Part 107 Practice Tests › Aviation Weather Questions › Question 42
What does a very small temperature-dew point spread indicate?
- A.The air is very dry and visibility will improve quickly
- B.The air is near saturation and fog or low clouds are likely to form
- C.Strong turbulence is certain at the surface
Correct answer
B. The air is near saturation and fog or low clouds are likely to form
Why
When temperature falls to the dew point, water vapor condenses into visible droplets. A spread of only a degree or two is a classic warning sign for fog formation.
Source: FAA-G-8082-22 Ch. 3 · ACS knowledge area: Aviation Weather Sources and Effects · From the Aviation Weather practice bank (WEA-042).