Quantcast Atmospheric Stability - P-3030052

 

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CHAPTER TWO
AVIATION WEATHER
Towering cumulus are clouds nearing the thunderstorm stage. They can produce heavy rain
showers and moderate turbulence in and near the cloud. Icing is common above the freezing
level.
Cumulonimbus clouds are thunderstorm clouds. A cumulonimbus cloud is sometimes referred to
as a "CB." Cumulonimbus is an exceedingly dangerous cloud, with numerous hazards to flight
such as severe to extreme turbulence, hail, icing, lightning, and other hazards discussed in
Chapter Four. Figure 2-18 summarizes the weather conditions found in the various types of
clouds.
Cloud Groups
High Clouds
Middle Clouds
Low Clouds
Clouds with Extensive
Vertical Development
Visibility
Good to Fair
1/2 mile to a few feet
A few feet
A few feet
Icing
None to Light
None to Moderate
None to
Severe
Moderate
Turbulence
None to Light
None to Moderate
None to
Severe
Moderate
Figure 2-18 Cloud Families
209.
ATMOSPHERIC STABILITY
One of the most important meteorological considerations to a pilot is stability. Atmospheric
stability is one of the primary determinants of weather encountered in flight. In some cases, a
pilot may be able to determine if stable or unstable conditions exist along the route of flight.
There are three conditions of stability: stable, neutral stable, and unstable. We will consider each
of these individually by observing a ball inside a bowl. If the ball is displaced, and tends to
return to its original position, the ball is said to be stable (Figure 2-19).
TENDENCY TO RETURN
Figure 2-19 Stable
2-20 Atmospheric Mechanics of Winds, Clouds and Moisture, and Atmospheric Stability


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