Set of flashcards Meteorology AC (Page 1 of 4)

Flashcards	146
Language	English
Category	Technology
Level	University
Created / Updated	24.12.2024 / 08.01.2025
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What situation is called "over-development" in a weather report?

Vertical development of Cumulus clouds to rain showers

Change from blue thermals to cloudy thermals during the afternoon

Widespreading of Cumulus clouds below an inversion layer

Development of a thermal low to a storm depression

What is the gas composition of "air"?

Oxygen 21 % Nitrogen 78 % Noble gases / carbon dioxide 1 %

Nitrogen 21 % Oxygen 78 % Noble gases / carbon dioxide 1 %

Oxygen 78 % Water vapour 21 % Nitrogen 1 %

Oxygen 21 % Water vapour 78 % Noble gases / carbon dioxide 1 %

Weather phenomena are most common to be found in which atmospheric layer?

Stratosphere

Troposphere

Tropopause

Thermosphere

What is the mass of a "cube of air" with the edges 1 m long?

0,01225 kg

0,1225 kg

1,225 kg

12,25 kg

At what rate does the temperature change with increasing height according to ISA (International Standard Atmosphere) within the troposphere?

Increases by 2° C / 100 m

Decreases by 2° C / 100 m

Decreases by 2° C / 1000 ft

Increases by 2° C / 1000 ft

What is the mean height of the tropopause according to ISA (International Standard Atmosphere)?

11000 ft

18000 ft

36000 m

11000 m

The term "tropopause" is defined as...

the boundary area between the troposphere and the stratosphere.

the layer above the troposphere showing an increasing temperature.

the boundary area between the mesosphere and the stratosphere.

the height above which the temperature starts to decrease.

Temperatures will be given by meteorological aviation services in Europe in which unit?

Kelvin

Degrees Fahrenheit

Degrees Centigrade (° C)

Gpdam

What is meant by "inversion layer"?

An atmospheric layer where temperature increases with increasing height

An atmospheric layer where temperature decreases with increasing height

An atmospheric layer with constant temperature with increasing height

A boundary area between two other layers within the atmosphere

What is meant by "isothermal layer"?

An atmospheric layer where temperature increases with increasing height

An atmospheric layer where temperature decreases with increasing height

An atmospheric layer with constant temperature with increasing height

A boundary area between two other layers within the atmosphere

The mean temperature lapse rate with increasing height within the troposphere is...

2° C / 100 m.

2° C / 100 ft.

1° C / 100 m.

0,65° C / 100 m.

Which process may result in an inversion layer at about 5000 ft (1500 m) height?

Ground cooling by radiation during the night

Widespread descending air within a high pressure area

Intensive sunlight insolation during a warm summer day

Advection of cool air in the upper troposphere

An inversion layer close to the ground can be caused by...

ground cooling during the night.

thickening of clouds in medium layers.

large-scale lifting of air.

intensifying and gusting winds.

What is the ISA standard pressure at FL 180 (5500 m)?

1013.25 hPa

250 hPa

500 hPa

300 hPa

The pressure which is measured at a ground station and reduced to mean sea level (MSL) by means of the actual atmospheric conditions is called...

QFF.

QNH.

QFE.

QNE.

How do air density and flight performance change with decreasing temperature (at constant pressure)?

Air density increases, flight performance increases

Air density decreases, flight performance decreases

Air density increases, flight performance decreases

Air density decreases, flight performance increases

Which processes result in decreasing air density?

Increasing temperature, increasing pressure

Decreasing temperature, increasing pressure

Decreasing temperature, decreasing pressure

Increasing temperature, decreasing pressure

The pressure at MSL in ISA conditions is...

1013.25 hPa.

113.25 hPa.

15 hPa.

1123 hPa.

The height of the tropopause of the International Standard Atmosphere (ISA) is at...

36000 ft.

11000 ft.

5500 ft.

48000 ft.

The barometric altimeter indicates height above...

mean sea level.

a selected reference pressure level.

standard pressure 1013.25 hPa.

ground.

The altimeter can be checked on the ground by setting...

QNE and checking that the indication shows zero on the ground.

QFE and comparing the indication with the airfield elevation.

QFF and comparing the indication with the airfield elevation.

QNH and comparing the indication with the airfield elevation.

The barometric altimeter with QFE setting indicates...

height above standard pressure 1013.25 hPa.

true altitude above MSL.

height above the pressure level at airfield elevation.

height above MSL.

The barometric altimeter with QNH setting indicates...

height above standard pressure 1013.25 hPa.

true altitude above MSL.

height above the pressure level at airfield elevation.

height above MSL.

Given the following information, what is the true altitude? QNH: 983 hPa Altitude: FL 85 Outside Air Temperature: ISA - 10°

9400 ft

7296 ft

7600 ft

7904 ft

How can wind speed and wind direction be derived from surface weather charts?

By alignment and distance of isobaric lines

By alignment and distance of hypsometric lines

By alignment and labels of wind indicating arrows

By annotations from the text part of the chart

Which force causes "wind"?

Coriolis force

Centrifugal force

Pressure gradient force

Thermal force

Above the friction layer, with a prevailing pressure gradient, the wind direction is...

perpendicular to the isobars.

perpendicular to the isohypses.

at an angle of 30° to the isobars towards low pressure.

parallel to the isobars.

Which of the stated surfaces will reduce the wind speed most due to ground friction?

Flat land, lots of vegetation cover

Mountainous areas, vegetation cover

Flat land, deserted land, no vegetation

Oceanic areas

The movement of air flowing together is called...

divergence.

subsidence.

convergence.

soncordence.

The movement of air flowing apart is called...

divergence.

subsidence.

convergence.

concordence.

What weather development will result from convergence at ground level?

Descending air and cloud dissipation

Ascending air and cloud formation

When air masses meet each other head on, how is this referred to and what air movements will follow?

Divergence resulting in sinking air

Convergence resulting in sinking air

Divergence resulting in air being lifted

Convergence resulting in air being lifted

With regard to global circulation and air masses, what are the air masses that Central Europe is mainly influenced by?

Tropical and arctic cold air

Arctic and polar cold air

Tropical and subtropical warm air

Polar cold air and subtropical warm air

With regard to global circulation within the atmosphere, where does polar cold air meets subtropical warm air?

At the polar front

At the geographic poles

At the equator

At the subtropical high pressure belt

Winds blowing uphill are defined as...

anabatic winds.

katabatic winds.

convergent winds.

subsident winds.

Winds blowing downhill are defined as...

anabatic winds.

katabatic winds.

convergent winds.

subsident winds.

Air descending behind a mountain range is defined as...

anabatic wind.

katabatic wind.

convergent wind.

divergent wind.

"Foehn" conditions usually develop with...

stability, high pressure area with calm wind.

instability, high pressure area with calm wind.

instability, widespread air blown against a mountain ridge.

stability, widespread air blown against a mountain ridge.

What type of turbulence is typically found close to the ground on the lee side during Foehn conditions?

Thermal turbulence

Turbulence with formation of rotor clouds

Inversion turbulence

Clear-air turbulence (CAT)

Light turbulence always has to be expected...

below cumulus clouds due to thermal convection.

above cumulus clouds due to thermal convection.

when entering inversions.

below stratiform clouds in medium layers.

Meteorology AC

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