Page 11 - ICS Siebel 8.1 and Master Template.11.16.15_Neat

Atmosphere Stability

Atmosphere stability is defined as the resistance of the atmosphere to vertical motion. A stable
atmosphere resists any upward or downward movement. An unstable atmosphere allows an
upward or downward disturbance to grow into a vertical (convective) current.

Determining the stability
of the atmosphere
required measuring the
difference between the
actual existing (ambient)
temperature lapse rate of
a given parcel of air and
the dry adiabatic (3⁰C per
1,000 feet) lapse rate.
Because sUAS operate at
low altitudes, if may

Figure 3-2 Characteristic of state and unstable air masses seem as though lapse
reate may not be a factor,
but the stability o the local air mass can have significant impact on ambient conditions. Unstable
air can often result in weather conditions unfavorable to sUAS operations.
A stable layer of air would be associated with a temperature inversion (a condition in which warm
air is situated above cool or cold air). Warming from below, on the other hand, would decrease
the stability of an air mass, The conditions sown in Figure 3-2 can be characteristic of stable or
unstable air masses.

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 11