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Fog

Fog is a surface-based cloud (restricting visibility) composed of either water droplets or ice
crystals. Fog may form by cooling the air to its dew point or by adding moisture to the air near the
ground. A small temperature/dew point spread is essential to the formation of fog. An abundance
of condensation nuclei from combustion product makes fog prevalent in industrial areas.

Fog is classified by the way it is formed:

1. Radiation fog (ground fog) is formed when terrestrial radiation cools the ground, which in
turn-cools, the air in confact with it. When the air is cooled to its dew point (or within a
few degrees), fog will form. The fog will form moist readily in warm, moist air over low,
flattered areas on clear, calm (no wind) nights.
2. Advection fog (sea fog) is formed when warm, moist air moves (wind is required) over
colder ground or water (e.g., an air mass moving inland from the coast in winter).
3. Upslope fog is formed when moist, stable air is cooled to its dew point as it moves up along
sloping terrain (wind is required). Coding will be at the dry adiabatic lapse rate of
approximately 3⁰C per 1,000 feet.

Perception rain or drizzle-inducted fog is most commonly associated with frontal activity and is
formed by relatively warm drizzle or rain failing through cooler air. Evaporation from the
precipitation saturates the cool air and fog forms. This fog is especially critical because it occurs
in the proximity of precipitation and other possible hazards such as icing, turbulence and
thunderstorms.

Steam fog forms in the winter when cold, dry air passes form land areas over comparatively warm
ocean. Low-level turbulence can occur and icing can become hazardous in a steam fog.

Remote pilots should be cautious when conditions are conducive to the formation of fog (e.g.,
when temperature and dew points are covering), especially at dusk or before dawn. Visibility can
rapidly change once fog beginnings to form. The sUAS should be recovered if visibility
approaches the 3 SM minimum.

Next Steps:
Instructions: Go to Google Classroom – Day 1 – Quiz- Click to launch quiz and complete. When
complete click submit.

✓ Quiz – complete the quiz for this section before proceeding to Chapter 2.
✓ Student Breakout Groups: Students are encouraged to attend the daily student breakout
groups to work collaboratively with other students to prepare for quiz, prepare flash cards
or study guides in preparation to take the FAA Knowledge Exam.
✓ For more information: Contact instructor and/or click links for online test prep links for
continuous test taking strategies and practice in preparation to take the FAA Knowledge
Exam.

Density Altitude

DRONE PART 107 CERTICIFACTION PREPARATION COURSE 16