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Private Pilot Ground School
CH 7 #1-36 Gleim Test Book
36
Aviation
04/03/2011

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Term

Every phsical process of weather is accompanied by, or is the sesult of, a...

 

Definition
heat exchange
Term
What causes variations in altimeter settings between weather reporting points?
Definition
Unequal heating of the Earth's surface
Term
The wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This difference in direction is primarily due to
Definition
friction between the wind and surface.
Term
Convective circulation patterns associated with sea breezes are caused by
Definition
cool, dense air moving inland from over the water.
Term
The development of thermal depends upon
Definition
solar heating.
Term
The boundary between two different air masses is referred to as a
Definition
front
Term
One weather phenomenon which will always occur when flying across a front is a change in the
Definition
wind direction
Term
One of the most easily recongnized discontinuities across a front is
Definition
a change in temperature.
Term
If there is thunderstorm activity in the vicinity of an airport at which you plan to land, which hazardous atmospheric phenomenon might be expected on the landing approach?
Definition
Wind-shear turbulence
Term
A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold front is known as a
Definition
squall line
Term
What conditions are necessary for the formation of thunderstorms?
Definition
High humidity, lifting force, and unstable conditions 
Term
During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?
Definition
Dissipating
Term
Thunderstorms reach their greatest intensity during the
Definition
mature stage
Term
What feature is normally associated with the cumulus stage of a thunderstorm?
Definition
Continuous updraft
Term
Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?
Definition
Precipitation beginning to fall
Term
Thunderstorms which generally produce the most intense hazard to aircraft are
Definition
squall line thunderstorms
Term
Which weather phenomenon is always associated with a thunderstorm?
Definition
Lightning
Term
One in-flight condition necessary for structural icing to form is
Definition
visible moisture
Term
In which environment is aircraft structural ice most likely to have the highest accumulation rate?
Definition
Freezing rain
Term
The presence of ice pellets at the surface is evidence that there
Definition
is a temperature inversion with freezing rain at a hight altitude.
Term
An almond or lens-shaped clod which appears stationary, but which may contain winds of 50 knots or more, is referred to as
Definition
a lenticular cloud
Term
Crests of standing mountain waves may be marked by stationary, lens-shaped clouds known as
Definition
standing lenticular clouds
Term
Possible mountain wave turbulence could be anticipated when winds of 40 knots or greater blow
Definition
across a mountain ridge, and the air is stable.
Term
Where does wind shear occur?
Definition
At all altitudes, in all directions
Term
A pilot can expect a wind-shear zone in a temperature inversion whenever the windspeed at 2,000 to 4,000 feet above the surface is a least
Definition
25 knots
Term
When may hazardous wind shear be expected?
Definition
In areas of low-level temperature inversion, frontal zones, and clear air turbulence
Term
If the temperature/dewpoint spread is small and decreasing, and the temperature is 62 F, what type weather is most likely to develop?
Definition
Fog or low clouds
Term
What is meant by the term "dewpoint"?
Definition
The temperature to which air must be cooled to become saturated.
Term
The amount of water vapor which air can hold depends on the
Definition
air temperature
Term
What are the processes by which moisture is added to unsaturated air?
Definition
Evaporation and sublimation
Term
Which conditions result in the formation of frost?
Definition
The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing
Term
Clouds, fog, or dew will always form when
Definition
water vapor condenses.
Term
Low-level turbulence can occur and icing can become hazardous in which type of fog?
Definition
Steam fog
Term
In which situation is advection fog most likely to form?
Definition
An air mass moving inland from the coast in winter.
Term
What situation is most conducive to the formation of radiation fog?
Definition
Warm, moist air over low, flatland areas on clear, calm nights
Term
What types of fog depend upon wind in order to exist?
Definition
Advection fog and upslope fog