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ASA Ab Initio > Meteorology > Flashcards

Meteorology Flashcards

1
Q

What conditions are required for the formation of ice on an airframe?

A
  • Body of the airframe is below 0 degrees celcius
  • Air temperature is between -40 and +10
  • Moisture present
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2
Q

What are the descriptors for turbulence?

A

Light -
Moderate -
Severe -

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3
Q

What are the four types of heat transfer?

A
  • Conduction
  • Convection
  • Advection
  • Radiation
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4
Q

What kind of turbulence is created by the wing tips of an airframe?

A

Wake Turbulence

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5
Q

What is Buys Ballot’s Law?

A

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.

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6
Q

What is Buys Ballot’s Law?

A

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.

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7
Q

Which direction does wind travel around areas of high pressure in the Southern Hemisphere?

A

Counter Clock-wise

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8
Q

Which direction does wind travel around areas of low pressure in the Southern Hemisphere?

A

Clock-wise

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9
Q

Which direction does wind travel around areas of high pressure in the Southern Hemisphere?

A

Anti Clock-wise

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10
Q

How are jetstreams formed?

A

Formed between

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11
Q

Which direction do jetstreams flow?

A

West to East

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12
Q

What are the conditions required for the formation of thunderstorms?

A

Convergence
Air instability
Low pressure

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13
Q

At what time is the diurnal temperature the lowest?

A

1 hour after sunrise

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14
Q

What are the stages of a cyclone’s life cycle?

A

Formative
Immature
Mature
Dissipating

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15
Q

What are the types of fog?

A

Radiation Fog
Sea Fog
Valley Fog

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16
Q

What are the types of fog?

A

Radiation Fog
Sea Fog
Advection Fog
Steam Fog

17
Q

What are the requirements for the formation of radiation fog?

A
  • Light winds below 5kt
  • Some cooling
  • Clear skies
  • High humidity
  • Condensation nuclei
18
Q

What are the methods of de-icing an airframe?

A
  • Pneumatic

- Mechanical

19
Q

Why is volcanic ash a hazard?

A
  • Corrosive
  • Conductive
  • Irregular fine shaped particles (very sharp edges)
  • Ash in the engine
20
Q

How would you describe the number of clouds in the sky?

A

1-2 FEW
3-4 SCAT
5-7 BKN
8 Overcast

21
Q

What is a Föhn Wind?

A

A type of dry, warm, down-slope wind that occurs in the lee (downwind side) of a mountain range.

22
Q

If a volcanic ash cloud has smaller particles, would you expect it to travel further or less far than average?

A

Further than average

23
Q

When may RV/RVR be reported?

A

When visibility is below 1500m

24
Q

When must RV/RVR be reported?

A

When visibility is below 800m

25
Q

When may RV/RVR be reported?

A

When visibility is below 1500m, but it must be reported below 800m

ASA Ab Initio (9 decks)

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