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ATPL Meteorology > Bgs Questions > Flashcards

Bgs Questions Flashcards

1
Q

What is the pressure lapse rate at sea level

A

1hpa / 27ft

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2
Q

What is the pressure lapse rate at 39,000ft

A

1 hpa = 105ft

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3
Q

For the same pressure gradient and density at 60°N, 50°N and 40°N the speed of the geostrophic wind will be greatest where

A

Greatest at 40°N

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4
Q

The presence of ice pellets at a height of 8000ft indicates?

A

Freezing rain at heights above 8000ft

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5
Q

What characterises a stationary front (wind wise)

A

The surface wind has its direction parallel to the front

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6
Q

When is the rainy seasons in equatorial Africa

A

March - may

October - November

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7
Q

What is the main role of the world meteorological organisation

A

Establish and implement together with ICAO a global regulatory framework for aviation meteorological services

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8
Q

What is airmet information

A

Information issued by an MWO conceding occurrence or expected occurrence of weather phenomena which may affect the safety of low level operations not already included in the forecast for the FIR

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9
Q

The difference between geostrophic wind and gradient wind is caused by

A

Curvature of isobars

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10
Q

What is the number of hurricanes in the North Atlantic each year

A

6

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11
Q

Assuming an initial trigger force is present what else is required for thunderstorms to develop

A

Moisture and unstable air

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12
Q

When does the easterly jet stream occur and what height

A

Only in summer in northern hemisphere at approx 45,000ft

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13
Q

What is the average vertical extent of radiation fog

A

500ft

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14
Q

How can the Mediterranean climate be best described

A

Anticyclonic and hot in summer

Frontal depressions in winter

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15
Q

How are easterly waves identifiable on a surface weather chart

A

Weak trough

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16
Q

Characteristics of cumuliform cloud

A

Large water droplets

Instability

Turbulence

Showers

Mainly clear ice

17
Q

What is Bergeron- fondeisen

A

All precipitation starts at temp below 0°c

SCWD

Or

Ice crystals

18
Q

When is a cold pool most evident

A

Usually most evident in circulation

/ temperature fields of the middle troposphere /

May show little or no sign on surface chart

19
Q

When might glaze / clear ice be formed

A

When SCWD are large and at a temperature just below freezing

20
Q

What time of year are tornados most likely in North America

A

Spring / summer

21
Q

What is a well separated CB

A

OCNL

22
Q

When is a special air report required

A 
Severe / moderate turbulence 
Severe mountain waves 
Severe / moderate icing 
Widespread thunderstorms 
Heavy dust / sand storm 
Thunderstorms with / without hail (but not ISOL)
Anything with volcanic activity

ATPL Meteorology (8 decks)

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