Weather Hazards Flashcards
What are the four levels of turbulence intensity?
a. Light
b. Moderate
c. Severe
d. Extreme
What are the four classifications of turbulence?
a. Thermal
b. Mechanical
c. Frontal
d. Wind shear
What type of frontal activity is likely to produce the most turbulence?
Fast-moving cold front
What type of icing is found in cumuliform clouds and unstable conditions?
Clear icing
What type front produces the most significant icing conditions?
Occluded front
What are the greatest hazards associated with induction and compressor icing?
Reduced airflow and FOD
What conditions are necessary for the formation of aircraft icing?
Visible moisture and temperatures between 0° and -20° C
Define slant range visibility.
The distance on final approach at which the runway environment is in sight
What is the minimum sky coverage constituting a ceiling?
5/8 (Broken) or a total obscuration
True or false: Advection fog is dissipated by solar heating.
False. The fog layer is usually too thick for solar heating to be effective.
If an aircraft encounters an ash cloud in flight, what is the best procedure for the pilot to use to escape
the cloud?
Execute 180° turn
What category of turbulence is characterized by large variations in airspeed and abrupt changes in attitude and altitude?
Severe turbulence
Turbulence occurring less than 1⁄3 of the time is described as ______.
Occasional
Moderate turbulence can extend as far as ______ miles downwind of a mountain wave.
300
What are the three types of wind shear turbulence?
Jet stream, gusty winds, temperature inversion
What are the two types of engine icing?
Compressor and induction icing
True or false: Induction icing requires visible moisture and sub-freezing temperatures.
False. Induction icing is a result of lower inlet pressures, and can occur in clear air and temperature as high as 10°.
True or false? When finding yourself in icing conditions, you can escape by flying into areas of colder temperatures.
True. At lower temperatures precipitation is already frozen and aircraft icing is not a hazard.
At what intensity of icing is rate of accumulation a problem if encountered for an extended period of time?
Light
Total visibility over half the horizon circle or greater is ______.
Prevailing visibility
______ is the distance that be seen directly upward from the ground into a surface-based obscuration
Vertical visibility (VV)
Which type of fog produces a thicker, more persistent layer?
Advection
