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AIRPLANE
FLIGHT TEST- WEATHER
55
Aviation
05/23/2008

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Term
Every physical process of weather is accompanied by, or is the result of, a
Definition
heat exchange
Term
A temperature inversion would most likely result in which weather condition?
Definition
An increase in temperature as altitude is increased
Term
The most frequent type of ground or surface-based temperature inversion is that which is produced by
Definition
terrestrial radiation on a clear, relatively still night
Term
Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high?
Definition
Smooth air, poor visibility, fog, haze, or low clouds
Term
Under which condition will pressure altitude be equal to true altitude?
Definition
When standard atmospheric conditions exist.
Term
Under what condition is pressure altitude and density altitude the same value?
Definition
At standard temperature
Term
If a flight is made from an area of low pressure into an area of high pressure without the altimeter setting being adjusted, the altimeter will indicate
Definition
lower than the actual altitude above sea level
Term
Under what condition will true altitude be lower than indicated altitude?
Definition
In colder than standard air temperature
Term
WHAT DOES AMBIENT MEAN?
Definition
AT ATLITUDE
Term
Which condition would cause the altimeter to indicate a lower altitude than true altitude?
Definition
Air temperature warmer than standard
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 the surface.
Term
The amount of water vapor which air can hold depends on the
Definition
air temperature
Term
Clouds, fog, or dew will always form when
Definition
water vapor condenses
Term
What measurement can be used to determine the stability of the atmosphere?
Definition
Actual lapse rate
Term
What would decrease the stability of an air mass?
Definition
Warming from below
Term
What is a characteristic of stable air?
Definition
Stratiform clouds
Term
Moist, stable air flowing upslope can be expected to
Definition
produce stratus type clouds
Term
What feature is associated with a temperature inversion?
Definition
A stable layer of air
Term
What is the approximate base of the cumulus clouds if the surface air temperature at 1,000 feet MSL is 70 °F and the dewpoint is 48 °F?
Definition
6,000 feet MSL
-Take the difference between the temperature at the station and the dewpoint. 70 - 48 = 22°F In a convective current, temperature and dew point converge at about 4.4° F (2.5° C) per 1,000 feet. So divide the difference by 4.4 and multiplay by 1000. 22 / 4.4 = 5 5 * 1000 = 5000 AGL So the cloud base is 5000 feet above the station, which is 1000 feet MSL. Add this height to obtain the final height MSL. 5000 feet + 1000 feet = 6000 feet MSL
Term
What are characteristics of a moist, unstable air mass?
Definition
Cumuliform clouds and showery precipitation
Term
What are characteristics of unstable air?
Definition
Turbulence and good surface visibility
Term
The suffix "nimbus,'' used in naming clouds, means
Definition
a rain cloud
Term
Clouds are divided into four families according to their
Definition
height range
Term
An almond or lens-shaped cloud 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
What clouds have the greatest turbulence?
Definition
Cumulonimbus.
Term
What cloud types would indicate convective turbulence?
Definition
Towering cumulus clouds
Term
The boundary between two different air masses is referred to as a
Definition
front
Term
One of the most easily recognized discontinuities across a front is
Definition
a change in temperature
Term
One weather phenomenon which will always occur when flying across a front is a change in the
Definition
wind direction
Term
Steady precipitation preceding a front is an indication of
Definition
stratiform clouds with little or no turbulence
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
When may hazardous wind shear be expected?
Definition
In areas of low-level temperature inversion, frontal zones, and clear air turbulence
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 at least
Definition
25 knots
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 conditions necessary for the formation of cumulonimbus clouds are a lifting action and
Definition
unstable, moist air
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
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
Thunderstorms which generally produce the most intense hazard to aircraft are
Definition
squall line thunderstorms
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
Upon encountering severe turbulence, which flight condition should the pilot attempt to maintain?
Definition
Level flight attitude
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
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
In which situation is advection fog most likely to form?
Definition
An air mass moving inland from the coast in winter
Term
What types of fog depend upon wind in order to exist?
Definition
Advection fog and upslope fog
Term
Low-level turbulence can occur and icing can become hazardous in which type of fog?
Definition
Steam fog
Term
WHAT DOES STRATUS MEAN?
Definition
LAYER
Term
WHAT DOES CUMULUS MEAN?
Definition
PILED UP
Term
These two cloud types are divided into four more groups that distinguish the cloud's altitude, WHAT ARE THEY?
Definition
HIGH CLOUDS(20,000+FT), MIDDLE CLOUDS(6,500-20,000FT), LOW CLOUDS(up to 6,500 feet), AND VERTICAL CLOUDS(FORM AT MANY HIGHTS)
Term
When stratus clouds contact the ground, they are called
Definition
FOG
Term
A long thin cloud which develops as the result of the passage of an aircraft at high altitudes
Definition
CONTRAIL