CH. 8/9 - WX Part 2 Flashcards
What is the boundary between two different airmasses called?
A front.
What weather change will always occur when flying across a front?
A change in temperature.
What type of clouds and precipitation do stable airmasses produce ahead of a front?
Stratiform clouds and steady precipitation.
What type of clouds and precipitation do unstable airmasses produce ahead of a front?
Cumuliform clouds and showery precipitation.
What three conditions are necessary for the formation of thunderstorms?
High humidity, lifting force, and unstable conditions.
Which type of clouds develop into thunderstorms and carry the greatest turbulence?
Cumulonimbus clouds.
Which type of thunderstorms generally produce the most intense hazard to aircraft?
Squall line thunderstorms.
What characterizes the developing (cumulus) stage of a thunderstorm?
Updrafts.
What characterizes the mature stage of a thunderstorm?
Both up and down drafts and the beginning of precipitation.
What characterizes the dissipating stage of a thunderstorm?
Downdrafts.
How does icing affect the flow of air over aircraft wings?
It spoils the smooth flow, decreasing lifting capability.
During what weather phenomenon is structural ice most likely to accumulate at the highest rate?
Freezing rain.
What should you consider doing if you encounter icing with the autopilot engaged?
Periodically disengage the autopilot and hand-fly the aircraft.
When does advection fog typically occur?
When an airmass moves inland from the coast in winter.
