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ATPL > Meteorology > Flashcards

Meteorology Flashcards

1
Q

What is an isobar

A

An isobar bar is a line on a meteorological chart that joins places of equal sea level pressure

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2
Q

What is the correct definition for the heat

A

Heat is a form of energy which is measured in calories

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3
Q

How the heat is absorbed by the earth surface

A

Insulation

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4
Q

Which are the conditions for which advection fog will be formed

A

Warm moist air over cold surface

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5
Q

When does the dirunal variation reach its maximum

A

Clear sky, still wind

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6
Q

State the correct definition of dewpoint

A

Dewpoint is the temperature where moist air must be cooled to reach saturation

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7
Q

From which of the following can the stability of the atmosphere be determined

A

ELR

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8
Q

What is DARL

A

It is the adiabatic temperature change for unsaturated air as it rises

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9
Q

How do clouds are formed

A

Adiabatic cooling of the rising air

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10
Q

Why does a Cumulus cloud have a flat base

A

Cu cloud has a flat base due to the uniform decrease in temperature of the DALR

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11
Q

The formation of the lenticular clouds is due to

A

Airflow rises over a mountain area and cools adiabatically on the hillside

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12
Q

What is the correct definition of fog

A

Parcels of low level air with small suspended water droplets to reduce visibility 

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13
Q

What is true about dewpoint temperature

A

Can be equal to or lower than the temperature of the air mass

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14
Q

Describe how radiation fog is formed

A

Ground calling due to radiation

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15
Q

Describe how frontal fog is formed

A

A warm air mass flowing across a colder surface

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16
Q

How advection fog is formed

A

Advection fog can occur quite suddenly at day or night, land or sea

17
Q

Radiation fog rises from the surface to

A

800 feet

18
Q

When does frost most likely occure

A

Frozen water cover when the earth surface has a subzero temperature

19
Q

What is true about thunderstorm formation

A

High moisture content in the air

20
Q

Describe the mature stage of the thunderstorm

A

Water droplets start to fall through the cloud drawing air down with them

21
Q

What is the cloud type most likely to proceed a thunderstorm

A

Altocumulus castallanos

22
Q

Which are the factors that caused the formation of the wind

A

Wind is a horizontal movement of air in the atmosphere by horizontal pressure difference

23
Q

When does the wind is said to be veering

A

A veering wind is when it changes its direction in a clockwise direction

24
Q

What is the pressure gradient force

A

A pressure gradient force acts at right angles to the isobars and is responsible for the movement of a parcel of air from high-pressure to low-pressure area

25
Q

What is the geostrophic force

A

The geostrophic force is an apparent force that acts on a parcel of air that is moving over the rotating earth surface

26
Q

What is the gradient wind

A

Gradient wind is the resulting wind which it blows around the curved isobars with a common circular low or high pressure patterns

27
Q

What are the factors that caused the geostrophic wind to be stronger than the gradient win around a low pressure pattern

A

Centrifugal force opposes the gradient force

28
Q

What is the correct definition of “the Bora”

A

It’s a cold katabatic wind that may produce violent gusts

29
Q

What is true about the jet streams

A

Jet streams are narrow bands of high speed upper thermal wind at a very high altitudes

30
Q

Where is located the core of the jetstream

A

At the level where temperature change is little or nil and the pressure surface is at maximum slope

31
Q

What is true about the polar front of jet stream

A

It is located where there is little vertical temperature gradient but the horizontal pressure gradient is high enough

32
Q

In which of the following conditions a fohn wind occur

A

Fohn wind occur when the condensation level is higher on the lee side of the hill

33
Q

What are the air mass is most likely to affect Western Europe

A

Polar maritime and tropical maritime air

34
Q

What is the weather associated with low pressure system

A

Frontal weather

35
Q

What is the weather associated with high pressure system

A

Light winds

36
Q

What is the gradient of a warm front

A

1:150

37
Q

What is the gradient of cold front

A

1:50

ATPL (7 decks)

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