Weather 3 Flashcards
The boundary between two different air masses is referred to as a
1 frontolysis.
2 front.
3 frontogenesis.
front.
The conditions necessary for the formation of cumulonimbus clouds are a lifting action and
1 either stable or unstable air.
2 unstable, moist air.
3 unstable air containing an excess of condensation nuclei.
unstable, moist air.
In which environment is aircraft structural ice most likely to have the highest accumulation rate?
1 Freezing drizzle.
2 Cumulus clouds with below freezing temperatures.
3 Freezing rain.
Freezing rain.
Thunderstorms reach their greatest intensity during the
1downdraft stage.
2 cumulus stage.
3 mature stage.
mature stage.
One weather phenomenon which will always occur when flying across a front is a change in the
1 stability of the air mass.
2 type of precipitation.
3 wind direction.
wind direction.
One of the most easily recognized discontinuities across a front is
1 a change in temperature.
2 an increase in cloud coverage.
3 an increase in relative humidity.
a change in temperature.
Which weather phenomenon is always associated with a thunderstorm?
1 Heavy rain.
2 Lightning.
3 Hail.
Lightning.
A stable air mass is most likely to have which characteristic?
1 Poor surface visibility.
2 Turbulent air.
3 Showery precipitation.
Poor surface visibility.
Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?
1 Precipitation beginning to fall.
2 The appearance of an anvil top.
3 Maximum growth rate of the clouds.
Precipitation beginning to fall.
What are characteristics of unstable air?
1 Turbulence and poor surface visibility.
2 Nimbostratus clouds and good surface visibility.
3 Turbulence and good surface visibility.
Turbulence and good surface visibility.
During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?
1 Cumulus.
2 Dissipating.
3 Mature.
Dissipating.
Which conditions result in the formation of frost?
1 The temperature of the collecting surface is at or below freezing when small droplets of moisture fall on the surface.
2 The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing.
3 The temperature of the surrounding air is at or below freezing when small drops of moisture fall on the collecting surface.
The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing.
What is a characteristic of stable air?
1 Cumulus clouds.
2 Unlimited visibility.
3 Stratiform clouds.
Stratiform clouds.
What are the characteristics of stable air?
1 Good visibility and steady precipitation.
2 Poor visibility and steady precipitation.
3 Poor visibility and intermittent precipitation.
Poor visibility and steady precipitation.
What feature is normally associated with the cumulus stage of a thunderstorm?
1 Frequent lightning.
2 Continuous updraft.
3 Roll cloud.
Continuous updraft.
One in-flight condition necessary for structural icing to form is
1 small temperature/dewpoint spread.
2 visible moisture.
3 stratiform clouds.
visible moisture.
What conditions are necessary for the formation of thunderstorms?
1 High humidity, high temperature, and cumulus clouds.
2 High humidity, lifting force, and unstable conditions.
3 Lifting force, moist air, and extensive cloud cover.
High humidity, lifting force, and unstable conditions.
What are characteristics of a moist, unstable air mass?
1 Turbulence and showery precipitation.
2 oor visibility and smooth air.
3 Haze and smoke.
Turbulence and showery precipitation.
