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70 Cards in this Set

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What information is contained in a CONVECTIVE SIGMET?
Tornadoes, embedded thunderstorms, and hail 3/4 inch or greater in diameter.
Which in-flight advisory would contain information on severe icing not associated with thunderstorms?
SIGMET.
SIGMETs are issued as a warning of weather conditions hazardous to which aircraft?
All aircraft.
AIRMETs are advisories of significant weather phenomena but of lower intensities than Sigmets and are intended for dissemination to
all pilots.
When requesting weather information for the following morning, a pilot should request
an outlook briefing.
When the term 'light and variable' is used in reference to a Winds Aloft Forecast, the coded group and windspeed is
9900 and less than 5 knots.
What values are used for Winds Aloft Forecasts?
True direction and knots.
For aviation purposes, ceiling is defined as the height above the Earth's surface of the
lowest broken or overcast layer or vertical visibility into an obscuration
When telephoning a weather briefing facility for preflight weather information, pilots should state
the aircraft identification or the pilot's name.
Individual forecasts for specific routes of flight can be obtained from which weather source?
Transcribed Weather Broadcasts (TWEBs).
Transcribed Weather Broadcasts (TWEBs) may be monitored by tuning the appropriate radio receiver to certain
VOR and NDB frequencies.
What information is provided by the Radar Summary Chart that is not shown on other weather charts?
Lines and cells of hazardous thunderstorms.
The suffix 'nimbus,' used in naming clouds, means
a rain cloud.
Clouds are divided into four families according to their
height range.
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.
Crests of standing mountain waves may be marked by stationary, lens-shaped clouds known as
standing lenticular clouds.
What cloud types would indicate convective turbulence?
Towering cumulus clouds.
What clouds have the greatest turbulence?
Cumulonimbus.
What situation is most conducive to the formation of radiation fog?
Warm, moist air over low, flatland areas on clear, calm nights.
In which situation is advection fog most likely to form?
An air mass moving inland from the coast in winter.
What types of fog depend upon wind in order to exist?
Advection fog and upslope fog.
One of the most easily recognized discontinuities across a front is
a change in temperature.
One weather phenomenon which will always occur when flying across a front is a change in the
wind direction.
Steady precipitation preceding a front is an indication of
stratiform clouds with little or no turbulence.
One in-flight condition necessary for structural icing to form is
visible moisture.
In which environment is aircraft structural ice most likely to have the highest accumulation rate?
Freezing rain.
Low-level turbulence can occur and icing can become hazardous in which type of fog?
Steam fog.
What is meant by the term 'dewpoint'?
The temperature to which air must be cooled to become saturated.
The amount of water vapor which air can hold depends on the
air temperature.
Clouds, fog, or dew will always form when
water vapor condenses.
What are the processes by which moisture is added to unsaturated air?
Evaporation and sublimation.
Which conditions result in the formation of frost?
The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing
The presence of ice pellets at the surface is evidence that there
is a temperature inversion with freezing rain at a higher altitude.
Which factor would tend to increase the density altitude at a given airport?
An increase in ambient temperature.
Under which condition will pressure altitude be equal to true altitude?
When the atmospheric pressure is 29.92 inches Hg.
Under what condition is pressure altitude and density altitude the same value?
At standard temperature.
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
lower than the actual altitude above sea level.
Under what condition will true altitude be lower than indicated altitude?
In colder than standard air temperature.
What is the approximate base of the cumulus clouds if the surface air temperature at 1,000 feet MSL is 70
6,000 feet MSL.
What are characteristics of a moist, unstable air mass?
cumuliform clouds and showery precipitation.
What are characteristics of unstable air?
Turbulence and good surface visibility.
Moist, stable air flowing upslope can be expected to
produce stratus type clouds.
If an unstable air mass is forced upward, what type clouds can be expected?
Clouds with considerable vertical development and associated turbulence.
What measurement can be used to determine the stability of the atmosphere?
Actual lapse rate.
What would decrease the stability of an air mass?
Warming from below.
What is a characteristic of stable air?
Stratiform clouds.
Every physical process of weather is accompanied by, or is the result of, a
heat exchange.
What causes variations in altimeter settings between weather reporting points?
Unequal heating of the Earth's surface.
A temperature inversion would most likely result in which weather condition?'
An increase in temperature as altitude is increased.
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.
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.
Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?
Precipitation beginning to fall.
The conditions necessary for the formation of cumulonimbus clouds are a lifting action and
unstable, moist air.
What conditions are necessary for the formation of thunderstorms?
High humidity, lifting force, and unstable conditions.
During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?
Dissipating.
Thunderstorms reach their greatest intensity during the
mature stage.
Thunderstorms which generally produce the most intense hazard to aircraft are
squall line thunderstorms.
A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold front is a known as a
squall line.
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?
Wind-shear turbulence.
Upon encountering severe turbulence, which flight condition should the pilot attempt to maintain?
Level flight attitude.
What feature is normally associated with the cumulus stage of a thunderstorm?
Continuous updraft.
Which weather phenomenon is always associated with a thunderstorm?
Lightning.
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 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.
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
25 knots.
Which type of weather briefing should a pilot request to supplement mass disseminated data?
An abbreviated briefing.
Radar weather reports are of special interest to pilots because they indicate
location of precipitation along with type, intensity, and cell movement of precipitation.
A weather briefing that is provided when the information requested is 6 or more hours in advance of the proposed departure time is
an outlook briefing.
What should pilots state initially when telephoning a weather briefing facility for preflight weather information?
State their total flight time.
What does the heavy dashed line that forms a large rectangular box on a radar summary chart refer to?
Severe weather watch area.