MET pre-pt 4 Flashcards
For an aircraft established on the final approach path having passed below a cloud associated with a microburst, the most severe hazard experienced is likely to be
a.alternating yawing movements
b.pitch changes, without pilot input
c.increasing headwind
d.reduced visibility
b.pitch changes, without pilot input
[ ] provides a visual clue to help locate and therefore avoid an area of wind shear.
[Virga]
Orographic thunderstorms may occur:
a.Mostly in the early morning
b.At any time during the day or night
c.Almost exclusively during the daylight hours
d.Mostly between sunset and 2am
b.At any time during the day or night
What weather situation leads to the formation of a downburst?
a.The presence of a growing thermal bubble above a desert in summer time
b.Cold air descending down from a mature cumulonimbus
c.Turbulence formation in a stable air mass over mountainous terrain
d.a sudden change in wind direction at the passage of a front
b.Cold air descending down from a mature cumulonimbus
What is the conclusion for a pilot flying in the weather mentioned in the message below?
171020Z 21005kt 9000 FEW033CB SCT040 BKN100 19/18 Q1005 TEMPO 25015G25kt 3000 TSRA SCT005 BKN015CB
a.Caution is needed for rain showers developing in the next three hours
b.There are thunderstorms present that should be avoided
c.Passage under the thunderstorms with this base is safe
d.The CB clouds are in the vicinity and do not require action by the pilot
b.There are thunderstorms present that should be avoided
Using the synoptic image below of a low pressure system in the N Hemisphere, the wind direction over the land at point E will be from the
[west]
The gas in the atmosphere that can cause problems in flight (breathing, chest) is
[ozone]
What is the reason for the seasonal movement of the Inter-tropical Convergence Zone (ITCZ)?
a.Changes in the length of the daylight period
b.Heat reflectivity of the Earth’s surface
c.the varying height of the tropopause
d.The yearly movement of the sun relative to the Earth’s surface
d.The yearly movement of the sun relative to the Earth’s surface
The dew point is defined as the
a.Temperature at which the vapour present in a sample of air would just cause saturation
b.Temperature at which moisture in the air will condense as a layer of frost on any exposed surface
c.The ratio of vapour pressure of a sample of air to the saturation pressure at the existing temperature
d.The temperature at which the pressure exerted by the surroundings upon a liquid is equalled by the pressure exerted by the vapour of the liquid
a.Temperature at which the vapour present in a sample of air would just cause saturation
Which cold front has the highest speed of displacement
[2]
A blocking anti-cyclone in the northern hemisphere is
a.A cold anti-cyclone, situated between 50oN and 70oN and steering depressions
b.A quasi-stationary, cold anti-cyclone, situated between 50oN and 70oN
c.A cold anti-cyclone, situated over Scandinavia and steering depressions
d.A quasi-stationary, warm anti-cyclone, situated between 50oN and 70oN
d.A quasi-stationary, warm anti-cyclone, situated between 50oN and 70oN
What causes the difference in electrical potential between the ionosphere and the earth’s surface?
a.Fair weather current flows
b.Distance between the sun and the earth (aphelion and perihelion)
c.Distribution of thunderstorms
d.Adiabatic warming and atmospheric stability
c.Distribution of thunderstorms
When high level convergence occurs in the atmosphere the surface pressure [ ] in the area below and the air [ ].
[rises] [subsides]
With regard to volume and temperature of an ascending parcel of air, the volume [ ] while the temperature [ ].
[increases] [decreases]
