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Stage 2 Exam practice Weather
Terms in this set (40)
Crests of standing mountain waves may be marked by stationary, lens-shaped clouds known as
standing lenticular clouds
What conditions are necessary for the formation of thunderstorms?
High humidity, lifting force, and unstable conditions
A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold front is known as a
Steady precipitation preceding a front is an indication of
stratiform clouds with little or no turbulence
If the temperature/dewpoint spread is small and decreasing, and the temperature is 62Â°F, what type weather is most likely to develop?
Fog or low clouds
How does frost affect the lifting surfaces of an airplane on takeoff?
Frost may prevent the airplane from becoming airborne at normal takeoff speed
What is a characteristic of stable air?
A temperature inversion would most likely result in which weather condition?
An increase in temperature as altitude is increased
What types of fog depend upon wind in order to exist?
Advection fog and upslope fog
What clouds have the greatest turbulence?
Clouds are divided into four families according to their
The most frequent type of ground or surface-based temperature inversion is that which is produced by
terrestrial radiation on a clear, relatively still night
How will frost on the wings of an airplane affect takeoff performance?
Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability
The boundary between two different air masses is referred to as a
Possible mountain wave turbulence could be anticipated when winds of 40 knots or greater blow
across a mountain ridge, and the air is stable
The conditions necessary for the formation of cumulonimbus clouds are a lifting action and
unstable, moist air
In which environment is aircraft structural ice most likely to have the highest accumulation rate?
Moist, stable air flowing upslope can be expected to
produce stratus type clouds
The wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This difference in direction is primarily due to
friction between the wind and the surface
Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high?
Smooth air, poor visibility, fog, haze, or low clouds
What are characteristics of a moist, unstable air mass?
Cumuliform clouds and showery precipitation
If an unstable air mass is forced upward, what type clouds can be expected?
Clouds with considerable vertical development and associated turbulence
What causes variations in altimeter settings between weather reporting points?
Unequal heating of the Earth's surface
What would decrease the stability of an air mass?
Warming from below
Convective circulation patterns associated with sea breezes are caused by
cool, dense air moving inland from over the water
A stable air mass is most likely to have which characteristic?
Poor surface visibility
Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?
Precipitation beginning to fall
During an IFR cross-country flight you picked up rime icing which you estimate is 1/2" thick on the leading edge of the wings. You are now below the clouds at 2000 feet AGL and are approaching your destination airport under VFR. Visibility under the clouds is more than 10 miles, winds at the destination airport are 8 knots right down the runway, and the surface temperature is 3 degrees Celsius. You decide to
use a faster than normal approach and landing speed
One of the most easily recognized discontinuities across a front is
a change in temperature
What feature is normally associated with the cumulus stage of a thunderstorm?
The suffix 'nimbus,' used in naming clouds, means
a rain cloud
During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?
Every physical process of weather is accompanied by, or is the result of, a
At approximately what altitude above the surface would the pilot expect the base of cumuliform clouds if the surface air temperature is 82Â°F and the dewpoint is 38Â°F?
10,000 feet AGL
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?
Upon encountering severe turbulence, which flight condition should the pilot attempt to maintain?
Level flight attitude
An almond or lens-shaped cloud which appears stationary, but which may contain winds of 50 knots or more, is referred to as
a lenticular cloud
The presence of ice pellets at the surface is evidence that there
is a temperature inversion with freezing rain at a higher altitude
What cloud types would indicate convective turbulence?
Towering cumulus clouds
What is the approximate base of the cumulus clouds if the surface air temperature at 1,000 feet MSL is 70Â°F and the dewpoint is 48Â°F?
6,000 feet MSL
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