Met Flashcards
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?
Orographic fog
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?
Embedded CB with showers
What is the mass of a “cube of air” with the edges 1 m long, at MSL according ISA?
1,225 kg
Which process may result in an inversion layer at about 5000 ft (1500 m) height?
Descending air in a high pressure area
What information is required to convert a minimum safe altitude into a lowest usable flight
level?
Lowest value of QNH and the lowest negative temperature deviation from ISA
A parcel of moist but not saturated air rises due to adiabatic effects. Which of the following
changes?
RElative humidity
Clouds, fog and dew will always be formed when:
Water vapor condenses
in TAF or METAR cloud level is given as highest…
The highest above aerodrome
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?
Less than 1000 ft
The wind that flows down mountain slopes at night as a result of cooling is
called:
Katabatic wind
The wind that flows up mountain slopes during the day caused by heating is
Anabatic wind
A flight at low level (below 3,000ft above ground level) in strong winds is
likely to:
Experience more frequent and sever turbulence over the land than
over the sea.
Cloud formed by convection that have a ‘lumpy’ to ‘heaped’ appearance
belong to:
Cumuliform
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?
3000 ft
Precipitation consisting of branded and star-shaped ice crystals which can
cause engine intake icing is called:
Snow
Rain which falls from the base of colds but evaporates before reading the
ground is called:
Virga
Small liquid droplets suspended in the air:
Decrease visibility as it scatters away from the pilot
A warm, maritime airflow over a relative colder land surface may give rise
to:
Advection Fog, mist and stratus
Area Report (METAR) and Terminal Aerodrome Forecast (TAF0 both
incorporate ‘6000 HZ’ which means:
6000 meters horizontal visibility in haze
The visibility group ‘R35/0400’ in Meteorological Area Report (METAR)
means:
Runway 35, Visual range 400
A tropical air mass that has originated over the ocean is referred to as:
Tropical maritime
A cool, polar air mass moves across warmer land surface:
Heat transfers to the air mass from the surface and it becomes more
unstable.
A high pressure weather system is associated with:
Descending heating and drying air. Being more stable. Results in a temperature inversion
A warm air mass replacing a cold air mass is called a
Warm front
A cold air mass replacing a warm air mass is called a:
Cold front
The general cloud associated with a warm front is:
Stratiform clouds
For a normally aspirated, piston engine throttle icing more likely at:
Lower power setting
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:
Area forecast covering the route valid 0800Z to 1700Z. Terminal
Aerodrome Forecasts (TAFs) valid 0900Z t 1800Z for departure,
destination and diversion airfields.
. In TAFs and METARs, the cloud base is given as:
Above the aerodrome
In a Meteorological Aerodrome Report (METAR) or Terminal Aerodrome
Forecast (TAF) ‘9999’ means:
Visibility in excess of 10 kilometres.
A METAR finishes off ‘Q1014 NOSIG=’. What does the
Q1014 mean?
There is a QNH of 1014 hectopascals at the airfield.
Most of the water vapour in the atmosphere is contained in the:
Troposphere
As altitude increases, atmospheric pressure:
Decreases
Aircraft measure static atmospheric pressure using:
Aneroid Barometer
A line on a map joining places of equal sea level pressure is called:
Isobar
The variation of pressure with horizontal distance is called:
Pressure gradient
The transfer of heat as electromagnetic waves is called the process of:
Radiation
The transfer of heat from body to body is called the process of:
Conduction
The transfer of heat by the horizontal motion of an air mass is called:
Advection
The transfer of heat by the vertical motion of an air mass is called:
Convection
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?
Widespread low clouds, strong wind extensive hill fog n the windward site of mountains.
The troposphere is mostly heated:
By the earths surface with convection and re readiation
Solar heating of the earth’s surface is:
Greatest at the tropics
At a given latitude and longitude, solar heating of the sea:
Is less rapid than land because water has a greater heat capacity.
A day with clear skies compared to one with overcast cloud will result in (assuming the same air mass):
A warmer day and colder night
If the air at the earth’s surface is cooler than that above there isa:
Temperature inversion
Reports of wind at an airfield passed to a pilot from its Air Traffic Control (tower frequency) are relative to:
Magnetic north at the airfield
A wind whose direction has changed in a CLOCKWISE direction (from 280° magnetic to 340° magnetic) has:
Veered
A wind whose direction has changed in an ANTI CLOCKWISE (from 100° true to 50° true) direction has:
Has backed
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:
The coriolis force, which acts perpendicular to the direction of motion
The coriolis force is proportional to:
Wind speed
The wind that flows around curved isobars is called the:
The gradient wind
At an airfield the surface wind is measured at:
10 meters above ground level
Over land, under a constant pressure gradient and clear skies; the surface wind speed by day is generally:
Greater during the day than at night
