Met Flashcards

1
Q

What type of fog emerges if humid and almost saturated air, is forced to rise upslope
of hills or shallow mountains by the prevailling wind?

A

Orographic fog

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2
Q

What clouds and weather may result from an humid and instable air mass, that is
pushed against a chain of mountains by the predominant wind and forced to rise?

A

Embedded CB with showers

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3
Q

What is the mass of a “cube of air” with the edges 1 m long, at MSL according ISA?

A

1,225 kg

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4
Q

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

A

Descending air in a high pressure area

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5
Q

What information is required to convert a minimum safe altitude into a lowest usable flight
level?

A

Lowest value of QNH and the lowest negative temperature deviation from ISA

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6
Q

A parcel of moist but not saturated air rises due to adiabatic effects. Which of the following
changes?

A

RElative humidity

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7
Q

Clouds, fog and dew will always be formed when:

A

Water vapor condenses

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8
Q

in TAF or METAR cloud level is given as highest…

A

The highest above aerodrome

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9
Q

A vertical of 1000 ft is the standard required separation between two FL. Under conditions
of cold air advection (ISA – 15 degrees Celsius), what would the true vertical separation be?

A

Less than 1000 ft

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10
Q

The wind that flows down mountain slopes at night as a result of cooling is
called:

A

Katabatic wind

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11
Q

The wind that flows up mountain slopes during the day caused by heating is

A

Anabatic wind

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12
Q

A flight at low level (below 3,000ft above ground level) in strong winds is
likely to:

A

Experience more frequent and sever turbulence over the land than
over the sea.

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13
Q

Cloud formed by convection that have a ‘lumpy’ to ‘heaped’ appearance
belong to:

A

Cumuliform

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14
Q

Just considering that exchange, if the moisture content of a parcel of air is
such that its dewpoint temperature is +7°C, at what height above the
ground is the cloud base likely to form if the surface air temperature is
+16°C?

A

3000 ft

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15
Q

Precipitation consisting of branded and star-shaped ice crystals which can
cause engine intake icing is called:

A

Snow

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16
Q

Rain which falls from the base of colds but evaporates before reading the
ground is called:

A

Virga

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17
Q

Small liquid droplets suspended in the air:

A

Decrease visibility as it scatters away from the pilot

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18
Q

A warm, maritime airflow over a relative colder land surface may give rise
to:

A

Advection Fog, mist and stratus

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19
Q

Area Report (METAR) and Terminal Aerodrome Forecast (TAF0 both
incorporate ‘6000 HZ’ which means:

A

6000 meters horizontal visibility in haze

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20
Q

The visibility group ‘R35/0400’ in Meteorological Area Report (METAR)
means:

A

Runway 35, Visual range 400

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21
Q

A tropical air mass that has originated over the ocean is referred to as:

A

Tropical maritime

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22
Q

A cool, polar air mass moves across warmer land surface:

A

Heat transfers to the air mass from the surface and it becomes more
unstable.

23
Q

A high pressure weather system is associated with:

A

Descending heating and drying air. Being more stable. Results in a temperature inversion

24
Q

A warm air mass replacing a cold air mass is called a

A

Warm front

25
Q

A cold air mass replacing a warm air mass is called a:

A

Cold front

26
Q

The general cloud associated with a warm front is:

A

Stratiform clouds

27
Q

For a normally aspirated, piston engine throttle icing more likely at:

A

Lower power setting

28
Q

The time currently 0600Z. The estimated time of departure for a planned
route is 1300Z. What meteorological product should be used for best
planning for weather enroute:

A

Area forecast covering the route valid 0800Z to 1700Z. Terminal
Aerodrome Forecasts (TAFs) valid 0900Z t 1800Z for departure,
destination and diversion airfields.

29
Q

. In TAFs and METARs, the cloud base is given as:

A

Above the aerodrome

30
Q

In a Meteorological Aerodrome Report (METAR) or Terminal Aerodrome
Forecast (TAF) ‘9999’ means:

A

Visibility in excess of 10 kilometres.

31
Q

A METAR finishes off ‘Q1014 NOSIG=’. What does the
Q1014 mean?

A

There is a QNH of 1014 hectopascals at the airfield.

32
Q

Most of the water vapour in the atmosphere is contained in the:

A

Troposphere

33
Q

As altitude increases, atmospheric pressure:

A

Decreases

34
Q

Aircraft measure static atmospheric pressure using:

A

Aneroid Barometer

35
Q

A line on a map joining places of equal sea level pressure is called:

A

Isobar

36
Q

The variation of pressure with horizontal distance is called:

A

Pressure gradient

37
Q

The transfer of heat as electromagnetic waves is called the process of:

A

Radiation

38
Q

The transfer of heat from body to body is called the process of:

A

Conduction

39
Q

The transfer of heat by the horizontal motion of an air mass is called:

A

Advection

40
Q

The transfer of heat by the vertical motion of an air mass is called:

A

Convection

41
Q

it is winter and an aircraft is flying in the warm sector of a depression. There are mountains
upwind. In theory, what condition can be expected?

A

Widespread low clouds, strong wind extensive hill fog n the windward site of mountains.

42
Q

The troposphere is mostly heated:

A

By the earths surface with convection and re readiation

43
Q

Solar heating of the earth’s surface is:

A

Greatest at the tropics

44
Q

At a given latitude and longitude, solar heating of the sea:

A

Is less rapid than land because water has a greater heat capacity.

45
Q

A day with clear skies compared to one with overcast cloud will result in (assuming the same air mass):

A

A warmer day and colder night

46
Q

If the air at the earth’s surface is cooler than that above there isa:

A

Temperature inversion

46
Q

Reports of wind at an airfield passed to a pilot from its Air Traffic Control (tower frequency) are relative to:

A

Magnetic north at the airfield

47
Q

A wind whose direction has changed in a CLOCKWISE direction (from 280° magnetic to 340° magnetic) has:

A

Veered

48
Q

A wind whose direction has changed in an ANTI CLOCKWISE (from 100° true to 50° true) direction has:

A

Has backed

48
Q

When a ‘parcel’ of air begins to move from high to low pressure, an ‘apparent’ or ‘inertial’ force begins to act on it which is:

A

The coriolis force, which acts perpendicular to the direction of motion

49
Q

The coriolis force is proportional to:

A

Wind speed

50
Q

The wind that flows around curved isobars is called the:

A

The gradient wind

51
Q

At an airfield the surface wind is measured at:

A

10 meters above ground level

52
Q

Over land, under a constant pressure gradient and clear skies; the surface wind speed by day is generally:

A

Greater during the day than at night