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be seen. A pilot should always expect the hazardous and invisible atmospheric phenomena
called wind sheer turbulence when operating anywhere near a thunderstorm (within 20 NM).
Microbursts are small- scale intense downdrafts which, as they get near the ground, speed
outward from the center in all directions. Maximum downdrafts at the center of a microburst may
be as strong as 6,000 feet per minutes far exceeding the capabilities of sUAS. Also, wind speeds
in excess of 45 knots and sheers of 90 knots or move may exist which may cause an upset or loss
of control of an sUAS. An individual microburst will seldom last longer than 15 minutes from
the time it strikes the ground until dissipation. The horizontal winds continue to increase during
the first 5 minutes with the maximum intensity winds and last approximately 2 – 4 minutes.

The most violent thunderstorms draw air into their cloud bases with great vigor. If the incoming
air has any initial rotating motion, it often forms an extremely concentrated vortex from the surface
well into the cloud. Meteorologists have estimated that wind in such a vortex can exceed 200
knots with pressure inside the vortex quite low. The strong winds gather dust ad debris an the low
pressure generates a funnel-shaped cloud extending downward from the cumulonimbus base. If
the cloud does not reach the surface, it is a funnel cloud, if it touches a land surface, it is a tornado.
Tornadoes occur with both isolated and squall line thunderstorms. Remote pilots should avoid
operations during or in close proximity to thunderstorm activity, especially those that appear to be
severe.

Remote pilots should be aware that some phenomenon (e.g. hail, lighting, wind sheer, and
microbursts) can occur well away from the center of the storm. Extreme caution is advised when
operating in conditions that may generate thunderstorms.

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.

DRONE PART 107 CERTICIFACTION PREPARATION COURSE 14