Quantcast Figure 2-25 Atmospheric Stability and Flight Conditions

 

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AVIATION WEATHER
CHAPTER TWO
Figure 2-24 Clouds in Stable and Unstable Air
There are a significant number of flight conditions associated with atmospheric stability, as
depicted in Figure 2-25. If one or more of these conditions is encountered, the stability of the
atmosphere can be easily determined, and other flight conditions can be predicted. Thus,
understanding the relationships among stability and flight conditions provides aircrew with a key
that unlocks many of the mysteries of weather phenomena.
Flight Conditions
Stable Atmosphere
Unstable Atmosphere
Cloud type
Stratus
Turbulence
Smooth
Rough
Visibility
Poor
Good (outside clouds)
Winds
Steady
Gusty
Steady
Showery
Icing
Rime
Clear
Air mass
Warm
Cold
Front
Warm
Cold
Figure 2-25 Atmospheric Stability and Flight Conditions
Being able to recognize the stability of the air while flying will help prepare you for the various
flight conditions you are experiencing. When encountering a change in weather conditions­apart
from what was briefed­the relationships in Figure 2-25 can also be a guide to understanding the
different options available and to making better decisions for avoiding weather hazards. Here
are some additional "signs in the sky" that indicate stable air: temperature inversions, low fog
and stratus, and rising air temperature while climbing. Thunderstorms, showers, towering
clouds, dust devils, and rapidly decreasing air temperature while climbing all indicate unstable
atmospheric conditions.
Atmospheric Mechanics of Winds, Clouds and Moisture, and Atmospheric Stability
2-23


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