Meteorology Flashcards
What conditions are required for the formation of ice on an airframe?
- Body of the airframe is below 0 degrees celcius
- Air temperature is between -40 and +10
- Moisture present
What are the descriptors for turbulence?
Light -
Moderate -
Severe -
What are the four types of heat transfer?
- Conduction
- Convection
- Advection
- Radiation
What kind of turbulence is created by the wing tips of an airframe?
Wake Turbulence
What is Buys Ballot’s Law?
In the Southern Hemisphere, if a person stands with their back to the wind, the atmospheric pressure is low to the right and high to the left.
What is Buys Ballot’s Law?
In the Southern Hemisphere, if a person stands with their back to the wind, the atmospheric pressure is low to the right and high to the left.
Which direction does wind travel around areas of high pressure in the Southern Hemisphere?
Counter Clock-wise
Which direction does wind travel around areas of low pressure in the Southern Hemisphere?
Clock-wise
Which direction does wind travel around areas of high pressure in the Southern Hemisphere?
Anti Clock-wise
How are jetstreams formed?
Formed between
Which direction do jetstreams flow?
West to East
What are the conditions required for the formation of thunderstorms?
Convergence
Air instability
Low pressure
At what time is the diurnal temperature the lowest?
1 hour after sunrise
What are the stages of a cyclone’s life cycle?
Formative
Immature
Mature
Dissipating
What are the types of fog?
Radiation Fog
Sea Fog
Valley Fog
What are the types of fog?
Radiation Fog
Sea Fog
Advection Fog
Steam Fog
What are the requirements for the formation of radiation fog?
- Light winds below 5kt
- Some cooling
- Clear skies
- High humidity
- Condensation nuclei
What are the methods of de-icing an airframe?
- Pneumatic
- Mechanical
Why is volcanic ash a hazard?
- Corrosive
- Conductive
- Irregular fine shaped particles (very sharp edges)
- Ash in the engine
How would you describe the number of clouds in the sky?
1-2 FEW
3-4 SCAT
5-7 BKN
8 Overcast
What is a Föhn Wind?
A type of dry, warm, down-slope wind that occurs in the lee (downwind side) of a mountain range.
If a volcanic ash cloud has smaller particles, would you expect it to travel further or less far than average?
Further than average
When may RV/RVR be reported?
When visibility is below 1500m
When must RV/RVR be reported?
When visibility is below 800m
When may RV/RVR be reported?
When visibility is below 1500m, but it must be reported below 800m
