Fog most directly impacts small unmanned aircraft system (sUAS) operations by

Fog is forecast to form when the surface air temperature reaches the dew point. The current temperature is 68°F, and the dew point is 62°F. After sunset, the temperature is expected to decrease at a rate of 1.5°F per hour. How many hours after sunset will fog most likely form?

Refer to Figure 15, which depicts Terminal Aerodrome Forecasts (TAFs) for KMEM and KOKC. According to the TAF for KMEM, a temporary period of fog (FG) with visibility of 1/2 SM is forecast. The primary effect of this fog on small unmanned aircraft systems (sUAS) performance is

(Refer to Figure 15.) According to the TAF for KMEM, a temporary condition of 1/2 SM fog is forecast between 1212Z and 1214Z. This fog would most significantly impact the performance of a small unmanned aircraft system (sUAS) by